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  Subjects -> ENGINEERING (Total: 2268 journals)
    - CHEMICAL ENGINEERING (190 journals)
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    - ELECTRICAL ENGINEERING (103 journals)
    - ENGINEERING (1201 journals)
    - ENGINEERING MECHANICS AND MATERIALS (380 journals)
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CIVIL ENGINEERING (183 journals)                     

Showing 1 - 183 of 183 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 17)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 35)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 28)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 30)
Architectural Engineering     Open Access   (Followers: 4)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 1)
Archives of Civil Engineering     Open Access   (Followers: 10)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 2)
ATBU Journal of Environmental Technology     Open Access   (Followers: 4)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 6)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription   (Followers: 1)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 10)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 4)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 4)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 15)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 15)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 12)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 11)
Case Studies in Structural Engineering     Open Access   (Followers: 9)
Cement and Concrete Composites     Hybrid Journal   (Followers: 17)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 2)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 5)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 7)
Civil And Environmental Engineering Reports     Open Access   (Followers: 5)
Civil and Environmental Research     Open Access   (Followers: 19)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 17)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 10)
Civil Engineering Dimension     Open Access   (Followers: 8)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 265)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 11)
Computers & Structures     Hybrid Journal   (Followers: 36)
Concrete Research Letters     Open Access   (Followers: 6)
Construction Economics and Building     Open Access   (Followers: 2)
Construction Engineering     Open Access   (Followers: 9)
Construction Management and Economics     Hybrid Journal   (Followers: 22)
Construction Science     Open Access   (Followers: 4)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 2)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 16)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 14)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 9)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 16)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access  
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 4)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 6)
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 2)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 22)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 16)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 14)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 9)
International Journal of Geo-Engineering     Open Access   (Followers: 3)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Masonry Research and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Pavement Research and Technology     Open Access   (Followers: 5)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 2)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 10)
International Journal of Structural Integrity     Hybrid Journal   (Followers: 2)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Built Environment     Open Access   (Followers: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 6)
International Journal Sustainable Construction & Design     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 15)
Journal of Building Engineering     Hybrid Journal   (Followers: 1)
Journal of Building Materials and Structures     Open Access   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 6)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 12)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 7)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Society     Hybrid Journal   (Followers: 4)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 24)
Journal of Construction Engineering     Open Access   (Followers: 7)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 19)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 8)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Journal of Fluids and Structures     Hybrid Journal   (Followers: 6)
Journal of Frontiers in Construction Engineering     Open Access   (Followers: 2)
Journal of Green Building     Full-text available via subscription   (Followers: 11)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 13)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 21)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (Followers: 5)
Journal of Marine Science and Engineering     Open Access   (Followers: 1)
Journal of Materials and Engineering Structures     Open Access   (Followers: 5)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 10)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 4)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 7)
Journal of Rehabilitation in Civil Engineering     Open Access   (Followers: 3)
Journal of Solid Waste Technology and Management     Full-text available via subscription   (Followers: 1)
Journal of Structural Engineering     Full-text available via subscription   (Followers: 40)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Sustainable Architecture and Civil Engineering     Open Access   (Followers: 3)
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 1)
Journal of the Civil Engineering Forum     Open Access  
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 4)
Jurnal Spektran     Open Access   (Followers: 1)
Jurnal Teknik Sipil dan Perencanaan     Open Access   (Followers: 1)
Konstruksia     Open Access  
KSCE Journal of Civil Engineering     Hybrid Journal   (Followers: 2)
Latin American Journal of Solids and Structures     Open Access   (Followers: 4)
Materiales de Construcción     Open Access  
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 17)
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 7)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 2)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 4)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 7)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 11)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 4)
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 10)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 6)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Selected Scientific Papers - Journal of Civil Engineering     Open Access   (Followers: 3)
Slovak Journal of Civil Engineering     Open Access   (Followers: 2)
Soils and foundations     Full-text available via subscription   (Followers: 4)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 9)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Safety     Hybrid Journal   (Followers: 7)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 23)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 13)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 8)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access  
Teknik     Open Access  
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
The Structural Design of Tall and Special Buildings     Hybrid Journal   (Followers: 6)
Thin Films and Nanostructures     Full-text available via subscription   (Followers: 2)
Thin-Walled Structures     Hybrid Journal   (Followers: 4)
Transactions of the VŠB - Technical University of Ostrava. Construction Series     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Underground Space     Open Access  
Water Science & Technology     Partially Free   (Followers: 25)
Water Science and Technology : Water Supply     Partially Free   (Followers: 22)

           

Journal Cover International Journal of Geo-Engineering
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 2092-9196 - ISSN (Online) 2198-2783
   Published by SpringerOpen Homepage  [226 journals]
  • Estimation of undrained shear strength of fine grained soils from cone
           penetration resistance

    • Authors: Abdul Karim Mohamad Zein
      Abstract: Background Many previous authors have proposed empirical methods for the evaluation of undrained shear strength S u of soft to stiff saturated cohesive soils from CPT cone resistance q c  data. Published works are rare on this topic for the cases of unsaturated and overconsolidated clays and therefore further studies are needed to study the S u versus q c relationship for such soils. This paper investigates the q c –S u correlation for Sudanese fine grained soils taking into account the soil type, moisture condition and stress history effects. Methods Database pertaining to many soil samples representing low to high plastic clays and silts collected from thirty different Sudanese states was used in this study for analysis. The S u values were determined from laboratory by the UU triaxial test method on undisturbed soil samples taken from adjacent borings and the CPT was performed by a mechanical adhesion jacket cone type. Results The S u values varied from 30.3 to 460 kPa in the clay soils and from 16 to 252 kPa in the silt soils with average values of 129 and 91 kPa respectively. The consistency of most clay soils could be described as firm to very stiff with few soft and hard samples. The values of empirical cone factor N k   were determined for the soil types considered and found to vary over a wide range of 35.1 to 55.6 with average values of 37.5 for clay soils and 44.1 for silt soils. Discussion A rigorous analysis of soil database was performed to model the S u –q c relationship taking into account the effects of plasticity index and overconsolidation ratio soil parameters. The cone factor  Nk values determined were analyzed and compared to those experienced in previous studies from different countries. The study results revealed that for a given soil the N k is not a simple constant but depends on several factors such as moisture condition and degree of stiffness prevailing in the field during testing. The N k values obtained are in close agreement with and confirm the 35 figure reported in previous studies for highly plastic clay and silt soils. The average N k values obtained are much higher than those reported in several countries for normally consolidated soft to firm saturated cohesive soils but are lower than values found in few studies for hard and overconsolidated soils. Interpretation of the CPT and S u database is different for saturated and unsaturated soils which makes comparison of the N k values difficult. Conclusions A reliable correlation cannot be directly developed between S u and q c for soils with different types and characteristics as both variables are influenced by several factors. The effects of soil type, moisture condition and stress history should be considered in studying the q c –S u  relationship. Reliable empirical relationships have been developed to estimate 
      PubDate: 2017-05-05
      DOI: 10.1186/s40703-017-0046-y
      Issue No: Vol. 8, No. 1 (2017)
       
  • Evaluation of adding crushed glass to different combinations of
           cement-stabilized sand

    • Authors: Sina Salamatpoor; Siavash Salamatpoor
      Abstract: One of the methods that can stabilize clean sand type (SP) is blending the waste crushed glass and cement with these sands. In this paper, the laboratory tests are conducted on combination of clean sand, crushed glass, and cement in different condition for soil stabilization. Blends were stabilized by cement with 3, 5 and 10 weight percent of specimens. Different compounds of crushed glass used in this paper consists of 100% SP (poor graded sand) and ratio of glass to sand is in sequence, 10/90, 30/70 and 50/50 (G/S). A series of drained triaxial, direct shear, unconfined compressive strength and standard proctor tests on various combinations of glass and stabilizing sands with cement. The results show that increasing the percentage of crushed glass will reduce the amount wopt samples in connection increases γd,max. It can also unconfined compressive strength (qu). Relative density and strength parameters c and ϕ significantly increase. The minimum value of crushed glass which is improved the sandy soil properties is 10%. Also, by adding 10, 30 and 50% crushed glass to sandy soil which had stabilized 10% cement, the samples shear strength will be increased to 70, 98 and 244%, respectively. Therefore, adding crushed glass to the soil will correct unsuitable soil parameters with respect to ease of implementation, very easy access and reduce operational costs associated with its use in construction work.
      PubDate: 2017-04-28
      DOI: 10.1186/s40703-017-0044-0
      Issue No: Vol. 8, No. 1 (2017)
       
  • Seismic site characterization at the western Cephalonia Island in the
           aftermath of the 2014 earthquake series

    • Authors: I. Kassaras; P. Papadimitriou; V. Kapetanidis; N. Voulgaris
      Abstract: Background The site response during a strong earthquake event may be proven crucial for earthquake hazard assessment and risk mitigation. Two moderate magnitude earthquakes that occurred in early 2014 in Cephalonia produced the largest ground motion values ever recorded in Greece, highly exceeding the provisions of the effective seismic code implying for local effects. This motivated the investigation of site response in the epicentral area presented herein. Methods We applied the HVSR method on free-field ambient noise measurements obtained during an in situ survey. 68 measurements were adopted for site characterization after their validation using earthquakes and geotechnical data. The site response was approximated by the peak frequency and the amplification ratio of the HVSR curves. Results The majority of measurements exhibit smooth lateral variations in the frequency range 0.7–17 Hz, at a factor up to 7 and they are clearly classified in two bands, a low (0.7–4 Hz) and a high one (5–17 Hz). Some discrepancies that are observed between microtremor measurements and earthquake recordings for peak frequencies <2 Hz and overall underestimated ambient noise HVSR amplification are likely explained by near-source, radiation pattern and/or nonlinear soil effects. Conclusions High frequencies combined with low amplification correlate with damage in the hardest hit areas. Low frequencies are aligned in a NNE-SSW direction in the epicentral area, similar to the strike of the activated fault, indicating that the properties of rocks along the fault zone have possibly been affected by slippage and/or dynamic effects.
      PubDate: 2017-04-14
      DOI: 10.1186/s40703-017-0045-z
      Issue No: Vol. 8, No. 1 (2017)
       
  • Investigation of ground behaviour adjacent to an embedded pile according
           to various tunnel volume losses

    • Authors: Suk-Min Kong; Hyuk-Sang Jung; Yong-Joo Lee
      Abstract: The rapid development of urban areas due to population and infrastructure growth has led to increased traffic congestion, greater demand for residential space and environmental issues. One solution for these problems is the development of underground space, especially tunnelling. However, tunnel collapse causes significant damage, so it is important to understand the interactive behaviour of soil-structure-tunnelling in urban areas. This study uses a model test to investigate the behaviour of an embedded pile and the surrounding ground due to tunnelling in soft ground. Tunnelling is simulated by volume loss (VL), and soil deformation is observed according to VL using close range photogrammetry and image processing. These data are compared by 3D numerical analysis.
      PubDate: 2017-03-07
      DOI: 10.1186/s40703-017-0043-1
      Issue No: Vol. 8, No. 1 (2017)
       
  • Seismic active earth pressure on bilinear retaining walls using a modified
           pseudo-dynamic method

    • Authors: Obaidur Rahaman; Prishati Raychowdhury
      Abstract: Background Proper understanding of seismic behavior of retaining structures is crucial during a strong earthquake event. In particular, response of retaining walls with bilinear backface, where a sudden change in the inclination along its depth make the problem more complex. This study focuses on estimating the seismic earth pressure coefficients of a retaining wall with bilinear backface using a modified pseudo-dynamic method. Methods In this method, the backfill soil is modeled as a visco-elastic Kelvin–Voigt material. A frequency-dependant amplification function is derived for the waves traveling along the backfill using well-established one-dimensional ground response analysis theory. A rigorous parametric study has been carried out to understand the effect of various parameters such as amplitude of base acceleration, direction of vertical acceleration, soil shear resistance angle, soil-wall friction angle, wall inclination, frequency ratio, and damping ratio on the seismic active earth pressure. Results It has been observed that the damping ratio of the backfill soil plays an important role, particularly when the frequency of wave is close to the natural frequency of the backfill. Further, the seismic active thrust is found to increase in both upper and lower segments of the wall when the frequency of the primary wave is greater than that of the shear wave. Comparison of results with the previous studies indicates that the conventional pseudo-dynamic methods significantly underestimate the seismic coefficients and seismic pressures, particularly for the high-intensity motions. Conclusions The results of the study show that the natural frequency and damping of the backfill soil have significant effect on the seismic active earth pressure coefficients. Comparison with conventional pseudo-static and pseudo-dynamic methods indicates that the previous methods largely underestimate seismic coefficients and seismic pressures (as much as 48%). This under-estimation is more prominent for higher-intensity motions and less-damped soil, where the soil amplification effects pose most importance. This modified pseudo-dynamic approach can further be used for design of bilinear retaining structures.
      PubDate: 2017-03-07
      DOI: 10.1186/s40703-017-0040-4
      Issue No: Vol. 8, No. 1 (2017)
       
  • Use of quick and hydrated lime in stabilization of lateritic soil:
           comparative analysis of laboratory data

    • Authors: A. A. Amadi; A. Okeiyi
      Abstract: A laboratory study was undertaken to evaluate and compare the stabilization effectiveness of different percentages (0, 2.5, 5, 7.5, 10%) of quick and hydrated lime when applied separately to locally available lateritic soil, a major soil group in the tropical and sub tropical regions. Performance evaluation experiments included: Atterberg limits, compaction, unconfined compression tests, California bearing ratio (CBR), swelling potential using CBR instrument and hydraulic conductivity. The soil mixtures used for unconfined compressive strength (UCS), CBR, swelling potential and hydraulic conductivity tests were compacted at optimum moisture content using the British standard light compactive effort and cured for 28 days. It was found that the quicklime caused the soil to have lower plasticity while hydrated lime yielded higher dry unit weight. Also, higher UCS especially at higher dosages (7.5 and 10%) was produced when soil sample was treated with quicklime. Similarly, the CBR values for quicklime sample clearly indicate that quicklime-stabilized soil have superior load bearing capacity. Finally, quicklime treated specimens reached slightly lower swelling values than the hydrated lime while no appreciable distinction in hydraulic conductivity values of specimens treated with the two types of lime was observed. From the foregoing results, quicklime is adjudged to have exhibited somewhat superior engineering properties and therefore creates a more effective stabilization alternative for the soil.
      PubDate: 2017-03-01
      DOI: 10.1186/s40703-017-0041-3
      Issue No: Vol. 8, No. 1 (2017)
       
  • Effect of different parameters on the behavior of strip footing resting on
           weak soil improved by granular piles

    • Authors: Basuony El-Garhy; Mohamed Elsawy
      Abstract: This paper presents a method to analyze strip footing resting on granular layer over weak soil improved by end bearing or floating granular piles. The granular layer beneath the strip footing idealized as incompressible shear layer. The weak soil idealized as soft Winkler springs and the granular piles idealized as stiff Winkler springs. These springs connected at their ends by a thin membrane under uniform tension to overcome the drawbacks of Winkler model related to the shear effect or the continuity of the granular piles-weak soil composite. Hyperbolic relationships used to represent the nonlinear behavior of weak soil and granular piles. Granular piles of different diameters, lengths, stiffness and arrangements can be modeled. The numerical solution obtained by the finite element method. The validity of the present analysis verified through comparisons with the field measurements, other existing analysis method and PLAXIS finite element program. A parametric study for a strip footing subjected to seven concentrated column loads carried out to study the effect of various parameters on the behavior of the soil-strip footing system. These parameters include number of granular piles, modular ratio, stiffness of granular layer, diameter of granular piles, length of granular piles and arrangements of granular piles. It is found that stiffness of granular layer has little effect compared to a significant effect of other parameters on the vertical and differential displacements and the induced bending moment of the strip footing.
      PubDate: 2017-03-01
      DOI: 10.1186/s40703-017-0042-2
      Issue No: Vol. 8, No. 1 (2017)
       
  • A numerical comparison of random vibration theory and time histories based
           methods for equivalent-linear site response analyses

    • Abstract: Dynamic site response is usually implemented using an equivalent-linear approach through analyses based on time-histories or random vibration theory (RVT). In the RVT approach the input motion is characterized in the frequency domain by means of Fourier Amplitude Spectra (FAS) or power spectral densities so that the need for selecting/developing multiple suitable time-histories is avoided. Nevertheless, past studies have found that RVT may produce results that differ significantly from empirically determined site amplification functions and from the time history approach. This work is aimed to further understand the potential differences in the results from RVT and time-histories based approaches by performing a comprehensive numerical evaluation that takes into account the effect of the input intensity level, input spectral shape, site conditions, and the methodology used to produce the input FAS. The results obtained corroborate that RVT over-predictions occur mainly at the site fundamental frequencies and are larger for relatively soft soil deposits with significant impedance contrast at the soil/rock interface. However, in the soft site evaluated the magnitude of the over-prediction was rather insensitive to the increase in the inelastic demand, conversely, the over-prediction in the stiffer site increased as the site softened due to the rising inelastic demand.
      PubDate: 2017-11-06
       
  • On the development of a non-linear calibration relationship for the
           purpose of clay content estimation from the natural gamma ray log

    • Abstract: The Shurijeh Formation of Early Cretaceous age is an important clastic sandstone reservoir rock in the Gonbadli field, NE Iran. The quantitative determination of Shurijeh clay minerals has been considered to be a very important and challenging task due to the heterogeneity of formation. The calibrated gamma ray log has been traditionally used as the primary estimator of volume of clay in the subsurface formations. The comparison between the core-measured values and the resulting estimates from the old calibration methods in Shurijeh Formation revealed that despite of applying old calibrations, the Shurijeh clay contents suffers from overestimations. Thus, the most accurate calibration for natural gamma ray log was developed, using the integration of quantitative mineralogical analyses from 76 core samples to estimate the volume of clay in Shurijeh Formation. The least percent relative error, i.e., 11.4%, was achieved in developing a new regression relationship in the form of a rational function acting as the most accurate non-linear clay indicator. The reliability of it was verified by the excellent correlation between the laboratory-measured clay contents in the core samples from another wells drilled in the mentioned Formation and the estimated values. The spectral log ratios have also been used to estimate the Formation depositional environment and different clay minerals types in it. It could truly be inferred that the Shurijeh was deposited in a marine environment with most of data having a thorium to uranium (Th/U) ratio in the range of 1–10. However, the indirect clay typing accomplished by several cross-plots, did not provide consistent results with the laboratory-determined types from the XRD test.
      PubDate: 2017-11-01
       
  • Contaminated dredged soil stabilization using cement and bottom ash for
           use as highway subgrade fill

    • Abstract: Large amount of sediments are dredged from connecting drains of River Yamuna as a part of its regular maintenance in Delhi. These dredged soils generally considered as waste due to its poor engineering properties. In this study attempt has been made to improve strength, durability and immobilize contaminants of the contaminated dredged soil collected from Najafgarh drain by mixing it with different proportion of cement–bottom ash mix so that it can suitably fulfill the requirements of highway subgrade materials. Compaction test, California bearing ratio test, wetting and drying test, toxicity characteristic leaching procedure leachate test and scanning electron microscope test were performed on the contaminated dredged soil specimens and the results indicated that cement–bottom ash mix was effective in improving the engineering properties of the contaminated dredged soils. Also, the test results of the contaminated dredged soil stabilized with cement–bottom ash mix were better in comparison to cement alone. From the study it reveals that the optimum proportion of additive to be used to improve properties of the contaminated dredged soils was 10% cement + 10% bottom ash mix for use it as a highway subgrade fill materials.
      PubDate: 2017-10-24
       
  • Prediction of the uniaxial compressive strength and Brazilian tensile
           strength of weak conglomerate

    • Abstract: Uniaxial compressive strength and tensile strength considered as important parameters in characterization of rock material in rock engineering. The necessary core samples cannot always be obtained from weak and block-in-matrix conglomeratic rock. For this reason, the predictive models can employed for the indirect estimation of mechanical parameters. The study investigated correlations uniaxial compressive strength and tensile strength with point load index. Numerous specimens of weak conglomerate were collected from different sites of dams in Iran. Predictive models include regression techniques and artificial neural network. To control performance of prediction capacity of equation, root mean square error and correlation coefficients were calculated. The correlation coefficients indices were calculated as 0.96 for the uniaxial compressive strength obtained from the regression model and 0.94 obtained from artificial neural network model; 0.605 for the tensile strength obtained from the regression model and 0.638 obtained from artificial neural network model.
      PubDate: 2017-09-12
       
  • Monitoring and evaluating of slope stability for setting out of critical
           limit at slope stability radar

    • Abstract: Slope stability monitoring and evaluating play vital role in the risk management of open cast mines. Generally, Issue of slope failure occurs at open cast mines due to undisciplined mining, impacts of weather conditions. Slope stability radar provide slope stability warning impending failure and also it has used for setting out threshold value. This threshold value obtained from parameter value, some previous scan data of radar at open cast mines and applied statistical analysis. After that it has carried out accurate result of slope stability monitoring area and remotely scanning region slopes to continuously measure any surface movements.
      PubDate: 2017-09-04
       
  • Determination of soil shear properties on a soil to concrete interface
           using a direct shear box apparatus

    • Abstract: Direct shear experiments were carried out both to investigate the interaction between a predominantly cohesion less soil and in-situ concrete and the validation of the tangent of two-third of the angle of internal friction angle normally assumed in design involving stability of structures with respect to friction. The tests for soil to soil interface indicate internal friction angles of 13.9° and 14.3°, while the soil to in situ concrete interface indicates friction angles of 24.9° and 27.9°. For the soil–concrete interface; the tangent of two-third of the friction angles gives values that are developed by a range of normal stress indicated by the direct shear experiment. These values are between 141 and 430 kPa. The friction values computed from the soil–concrete interface are very conservative for this range of normal stress. However for normal stress values less than 141 kPa, the use of the tangent of two-third of the angle of internal friction principle may not be safe as it may overestimate the friction values which such a system will develop. The study indicates that a range of stress level should be specified for a given friction value adopted in a design situation.
      PubDate: 2017-08-31
       
  • Analysis of blasted rocks fragmentation using digital image processing
           (case study: limestone quarry of Abyek Cement Company)

    • Abstract: One of the inseparable parts of mining activities is blasting which one of its important outcomes is fragmentation. Fragmentation is the first result of blasting that is directly related to the mining costs. There are various methods for determining the degree of fragmentation which are divided into two groups, direct and indirect methods. Among direct methods, sieve analysis and, among indirect methods, observational, empirical and digital image processing methods may be referred. In this study, which dealt with the amount of fragmentation in Pir Ali limestone mine, the digital image processing method and Split Desktop software that is the most efficient software in this respect were used. Three blocks with different blast patterns were analyzed to study the fragmentation phenomenon and, ultimately, the F20, F50 and F80 and top size values for each block were obtained separately. Outputs of the Split Desktop software were obtained in tabular form as well as cumulative grain-size curves. The F80 values for the 2.5 × 2.5 m, 2 × 2.5 m, and 2.5 × 3 m patterns were approximately 65.8, 56, and 70 cm, respectively. Finally, outputs of Split Desktop were compared to the results of the Kuz-Ram experimental model. The F80 values obtained for the 2.5 × 2.5 m, 2 × 2.5 m, and 2.5 × 3 m patterns were 54.9, 43.5, and 62.03 cm, respectively, which were in close agreement with the outputs from the software. It can be concluded that the closer F80 of the blasted rocks to the crusher entrance (60 cm), reduced the production costs, which is an outcome practically realized for the 2.5 × 2.5 m pattern.
      PubDate: 2017-08-24
       
  • Effect of salinity of water in lime-fly ash treated sand

    • Abstract: Ensuring sustainable development of coastal areas need improvement of road embankment infrastructure. Being a byproduct of industry, fly ash may be considered as environment friendly and low cost material for this purpose. However, scarcity of fresh water in coastal areas may compel to use saline water. To investigate the effects of sodium chloride content of mixing water on fly ash and lime mixed compacted sand, a series of the unconfined compression tests have been conducted on 50 mm diameter and 100 mm high specimens. Lime content was varied over a range of 1–5% of dry sand weight and fly ash contents were 9, 15 and 30% of dry sand weight. Besides, 0, 4 and 8% of sodium chloride were mixed with tap water, which were used for preparing specimens at 10% moisture content by compaction method. The specimens were cured for 7, 15, 30 and 60 days by spraying method. Experiment results show that, the unconfined compression strength of fly ash and lime mixed compacted sand increases with the increase in sodium chloride content. However, the long term effect of using saline water in fly ash and lime mixed compacted sand should be investigated, which is out of scope of this study.
      PubDate: 2017-08-08
       
  • Effect of nonplastic silt content on undrained shear strength of
           sand–silt mixtures

    • Abstract: To assess the behavior of sand–silt mixtures, strain-controlled monotonic triaxial tests were conducted on sand–silt mixtures of specimen size 71 mm in diameter and 142 mm in height at various relative densities but same isotropic effective confining pressure of 100 kPa. Concept of limiting fines content (LFC) was verified by these undrained monotonic triaxial tests. LFC was found to be the very important parameter to understand the behavior of sand–silt mixtures. The behavior of sand–silt mixture changes approximately at LFC. At constant relative density, increase in silt content decreases the undrained peak shear strength till LFC. After LFC the strength becomes near about same till pure silt sample. The reason of behavior could not be explained. At constant global void ratio, the peak shear strength decreases with increase in silt content till LFC and for further increment of silt content the peak shear strength increases. Sand–silt mixtures containing certain amount of silt which is near to the LFC showed flow type as well as brittle behavior. Failure of structure on this type of soil will be catastrophic during earthquake. In the case of permeability decreased with increasing silt content up to LFC. After the LFC, dry density is decreasing with increasing silt content but permeability remains constant till pure silt.
      PubDate: 2017-07-21
       
  • Behavior of seismic-acoustic parameters during deforming and failure of
           rock samples, large blocks and underground opening: base for monitoring

    • Abstract: Construction of engineered projects, such as underground spaces, tunnels, machine halls etc. is connected with variations in stress-state and deformations of large volumes of rock mass. Latter can results in damage of rocks, their collapse into underground space, danger for equipment and risk for human life. To avoid such consequences different in situ geotechnical and geophysical monitoring is carried out during construction and exploitation of underground structures. Geophysical monitoring is based on observations for behavior of elastic shear- and longitudinal wave velocities (Vs and Vp, respectively) and microseismic activity. Behavior of the elastic velocities during deforming of the rock depends on type of the future failure that, in turn, is defined by structure and properties of medium and characteristics of stress state σ 3/σ 1 and hydrostatic pressure. These velocity variations are defined by difference in effective parameters of forming microfractures, whose geometry is distinguished at different modes of stress-state. At that character of interaction between microfractures determines type of the macrofailure. We studied behavior of longitudinal wave velocities during loading of rock samples, large blocks and underground opening orienting measurements along maximum (σ 1) and minimum (σ 3) stresses. It is shown that velocity variations along maximum stress is more informative at elastic phase of rock deformations (velocity increases), whereas velocity variations along axis of minimum stress is more informative at the stage of nonlinear deformation of rock (velocity begin decrease). These regularities are well appeared at deforming of large blocks and unloading of rock mass in underground openings. This knowledge should be used at planning and performing of monitoring of stability of underground structures.
      PubDate: 2017-07-12
       
  • Evolution of pile shaft capacity over time in marine soils

    • Abstract: Driven pile foundations may experience an increase in bearing capacity overtime after installation which is referred to as pile set-up or freeze. Field observations have demonstrated that pile set-up could be substantial and the evolution of pile shaft capacity may continue for an extended time after pile installation. This paper presents results of a series of pile load tests conducted on medium-scale steel and concrete pile foundations driven into marine sensitive clay in Gloucester, Ontario. The piles were tested instantly after driving to measure their initial bearing capacities, and were tested repeatedly over different elapsed times to study the evolution of pile shaft capacity over time. The excess pore water pressure around the pile was also monitored by a piezometer. The pile performance analysis was established by monitoring the shaft capacity of driven model piles over 1 month in soft marine clay. The average pile capacity measurements for both steel and concrete piles showed approximately 4.5–5.5 times increase in the pile capacity 30 days after initial driving depending on the type of the piles used.
      PubDate: 2017-07-06
       
  • Numerical investigation of stone columns system for liquefaction and
           settlement diminution potential

    • Abstract: The aim of this study is the investigation of application of stone columns in decreasing liquefaction potential. Liquefaction potential of sand bed was studied by FLAC3D and validated by the results of VELACS international project. The effect of stone column was studied on decreasing excess pore pressure and soil settlement individually at the center of the model with different diameters. The effects of columns group were also studied on decreasing excess pore water pressure and soil settlement in a triangle arrangement. Finally an average vertical contact pressure of 100 kPa, which is approximately equal to the vertical pressure transmitted by a 10 story reinforced concrete building, was applied in the model. The implementation of stone columns individually, as a row or in groups with fewer numbers, caused a decrease in bulking in comparison to that of group using compressed meshing method. In certain numbers of columns, a decrease in distance among columns caused an increase in soil bulking. The columns group function will be better in settlement reduction, for center to center distance which is equal to 2.5–3.5 times of column’s diameter.
      PubDate: 2017-06-17
       
  • Application of a performance-displacement based method for the seismic
           assessment of earth dams

    • Abstract: This paper presents the application of a performance-displacement based assessment methodology to characterize the seismic response under several damage or performance-based scenarios of an earth dam. In the applied method, the system displacements are related to spectral accelerations and moment magnitudes in order to evaluate performance or damage scenarios. The earth dam selected for this study is the Carite Dam in Guayama, Puerto Rico. This embankment dam was built in 1913 in different phases with a raised embankment crest for flooding control in 1995. A finite element of the dam was developed to perform several incremental dynamic analyses. The dam geometry and materials properties were estimated based on extensive review of borings logs and technical reports provided by the administrators of the dam. The dynamic analyses were accomplished using seismic ground records with response spectrum made compatible with the design response spectrum from the ASCE-10 standard. Crest horizontal displacements were obtained from the dynamic analyses for different incremental factors and used to estimate moment magnitude and epicentral distances needed to attain the displacement limits.
      PubDate: 2017-06-05
       
 
 
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