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 Showing 1 - 183 of 183 Journals sorted alphabetically ACI Structural Journal       (Followers: 17) Acta Polytechnica : Journal of Advanced Engineering       (Followers: 2) Acta Structilia : Journal for the Physical and Development Sciences       (Followers: 2) Advances in Civil Engineering       (Followers: 35) Advances in Structural Engineering       (Followers: 28) Ambiente Construído       (Followers: 1) American Journal of Civil Engineering and Architecture       (Followers: 30) Architectural Engineering       (Followers: 4) Archives of Civil and Mechanical Engineering       (Followers: 1) Archives of Civil Engineering       (Followers: 10) Archives of Hydro-Engineering and Environmental Mechanics       (Followers: 2) ATBU Journal of Environmental Technology       (Followers: 4) Australian Journal of Structural Engineering       (Followers: 6) Baltic Journal of Road and Bridge Engineering       (Followers: 1) BER : Building and Construction : Full Survey       (Followers: 10) BER : Building Contractors' Survey       (Followers: 4) BER : Building Sub-Contractors' Survey       (Followers: 3) BER : Survey of Business Conditions in Building and Construction : An Executive Summary       (Followers: 4) Bioinspired Materials       (Followers: 5) Bridge Structures : Assessment, Design and Construction       (Followers: 15) Building and Environment       (Followers: 15) Building Women Built Environment Project and Asset Management       (Followers: 15) Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture       (Followers: 6) Canadian Journal of Civil Engineering       (Followers: 12) Case Studies in Engineering Failure Analysis       (Followers: 8) Case Studies in Nondestructive Testing and Evaluation       (Followers: 11) Case Studies in Structural Engineering       (Followers: 9) Cement and Concrete Composites       (Followers: 17) Challenge Journal of Concrete Research Letters       (Followers: 2) Challenge Journal of Structural Mechanics       (Followers: 5) Change Over Time       (Followers: 2) Civil and Environmental Engineering       (Followers: 7) Civil And Environmental Engineering Reports       (Followers: 5) Civil and Environmental Research       (Followers: 19) Civil Engineering = Siviele Ingenieurswese       (Followers: 4) Civil Engineering and Architecture       (Followers: 17) Civil Engineering and Environmental Systems       (Followers: 3) Civil Engineering and Technology       (Followers: 10) Civil Engineering Dimension       (Followers: 8) Cohesion and Structure       (Followers: 2) Composite Structures       (Followers: 265) Computer-aided Civil and Infrastructure Engineering       (Followers: 11) Computers & Structures       (Followers: 36) Concrete Research Letters       (Followers: 6) Construction Economics and Building       (Followers: 2) Construction Engineering       (Followers: 9) Construction Management and Economics       (Followers: 22) Construction Science       (Followers: 4) Constructive Approximation Curved and Layered Structures       (Followers: 2) DFI Journal : The Journal of the Deep Foundations Institute       (Followers: 1) Earthquake Engineering and Structural Dynamics       (Followers: 16) Enfoque UTE       (Followers: 4) Engineering Project Organization Journal       (Followers: 7) Engineering Structures       (Followers: 13) Engineering Structures and Technologies       (Followers: 2) Engineering, Construction and Architectural Management       (Followers: 14) Environmental Geotechnics       (Followers: 5) European Journal of Environmental and Civil Engineering       (Followers: 9) Fatigue & Fracture of Engineering Materials and Structures       (Followers: 16) Frattura ed Integrità Strutturale : Fracture and Structural Integrity Frontiers in Built Environment Frontiers of Structural and Civil Engineering       (Followers: 6) Geomaterials       (Followers: 4) Geosystem Engineering       (Followers: 1) Geotechnik       (Followers: 3) Géotechnique Letters       (Followers: 6) HBRC Journal       (Followers: 2) Hormigón y Acero HVAC&R Research Indoor and Built Environment       (Followers: 2) Infrastructure Asset Management       (Followers: 2) Infrastructures Ingenio Magno       (Followers: 1) Insight - 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 International Journal of Geosynthetics and Ground Engineering   [4 followers]  Follow        Subscription journal    ISSN (Print) 2199-9260 - ISSN (Online) 2199-9279    Published by Springer-Verlag  [2352 journals]
• Use of Polyamide-6 Type Engineering Polymer as Grouted Rock Bolt Material
• Authors: Eren Komurlu; Ayhan Kesimal; C. Okay Aksoy
Abstract: In this study, usability of Polyamide-6 type engineering polymer as a new rock bolt material was investigated carrying out a series of laboratory and field scale experiments. The Polyamide-6 type polymer tested as a grouted rock bolt material was assessed to have a good body strength, large elastic deformation limit and high energy absorbing capacity. The load bearing capacity of Polyamide-6 rock bolts was found to dominantly depend on the mechanical anchorage in front of the shank as a result of having low adhesion to the cement grout values. In this study, polyamide rock bolts have been designed with different mechanical anchors. It was suggested to start the systematical use of polyamide rock bolts having ideal support reactions under both static and dynamic load conditions in rock engineering. Especially, Polyamide-6 rock bolts were assessed to be economically usable in rock masses with squeezing, swelling or bursting problem, which need for non-decreasing support pressure while being higly deformed and good energy absorption capacity.
PubDate: 2017-11-08
DOI: 10.1007/s40891-017-0114-6
Issue No: Vol. 3, No. 4 (2017)

• Performance of Granular Piles-Improved Soft Ground Under Raft Foundation:
A Numerical Study
• Authors: Mohamed B. D. Elsawy; Basuony El-Garhy
Abstract: Reinforcing soft soil with granular piles improves effectively its properties. In the current research, the performance of granular piles reinforced soft soil under a uniformly loaded raft foundation has been investigated numerically utilizing Plaxis 3D. A parametric study was performed under drained loading conditions to investigate the effect of various parameters on the long-term behavior of the raft foundation such as spacing distance, diameter and length of the granular piles. The influence of the parameters has been studied on the overall settlement, bending moment of the raft and the lateral bulging of the granular piles. The results indicated that the existence of the granular piles in soft soil decreases significantly the settlement and the bending moment of the raft. The lateral bulging distribution of the granular piles is dependent on their locations. Additional improvements in the settlement and the bending moment of the raft, and in the lateral bulging also occurred due to the decrease of the spacing ratio, and the increase of area replacement ratio and granular piles length. Reinforcing soft soil using floating ground piles with length to soil layer thickness ratio of 0.75 is sufficient to achieve good improvement performance.
PubDate: 2017-10-27
DOI: 10.1007/s40891-017-0113-7
Issue No: Vol. 3, No. 4 (2017)

• Application of ANN and ANFIS for Predicting the Ultimate Bearing Capacity
• Authors: B. P. Sethy; C. R. Patra; N. Sivakugan; B. M. Das
Abstract: Extensive laboratory model tests were conducted on a rectangular embedded foundation resting over homogeneous sand bed and subjected to an eccentric load to determine the ultimate bearing capacity. Tests were conducted for foundations with width-to-length ratios (B/L) of zero (strip case), 0.333, 0.5, and 1. The depth of embedment varies from 0 to 1B with an increment of 0.5B; where B is the width of foundation and the eccentricity ratio (e/B) varies from 0 to 0.15 with an increment of 0.05. Based on the laboratory model test results, two different approaches are proposed to determine the ultimate bearing capacity. Firstly, a neural network model is developed to estimate the reduction factor. The reduction factor can be used to estimate the ultimate bearing capacity of an eccentrically loaded foundation from the ultimate bearing capacity of a centrally loaded foundation. A thorough sensitivity analysis was carried out to determine the important parameters affecting the reduction factor. Importance was given to the construction of neural interpretation diagram. Based on this diagram, whether direct or inverse relationships exist between the input and output parameters were determined. Secondly, an adaptive neuro-fuzzy interface system (ANFIS) is used to predict the ultimate bearing capacity. The neuro-fuzzy models combine the transparent, linguistic representation of a fuzzy system with learning ability of artificial neural networks (ANNs). The results from the ANN and ANFIS were compared with the laboratory model test results. It is clearly seen that the performance of the ANFIS model in our study is better than that of the ANN model.
PubDate: 2017-10-24
DOI: 10.1007/s40891-017-0112-8
Issue No: Vol. 3, No. 4 (2017)

• Stress and Deformation Characteristics of Nonwoven Geotextile Reinforced
Sand Under Different Directions of Principal Stress
• Authors: Alaa H. J. Al-Rkaby; H. R. Nikraz; A. Chegenizadeh
Abstract: A series of drained torsional shear tests using a hollow cylinder apparatus HCA was performed to investigate the anisotropic characteristics of sand in terms of the stress–strain and volumetric changes of large scale sand samples reinforced with nonwoven geotextile under different directions of principal stress α. Results revealed that the inclusion of geotextile resulted in a significant increase in the peak deviator stress when α was 0°, 15° and 30°, corresponding with considerable restraint against the expansion strain of the samples. When α was rotated towards the horizontal, α = 60–90°, reinforced samples exhibited clear anisotropic behavior. Variations in the peak deviator stress between the maximum value occurred at α = 0° and minimum at α = 60° was about 30–47% (depending on the number of geotextile layers). This indicates that the ability of layers embedded horizontally resisting the shearing decreased as the principal stress rotated towards the bedding plane. Under the conditions of α = 60–90° tensile strength of the geotextile could not be mobilized to the same extent, compared to α = 0–30°. Larger values of α resulted in less expansion strain of the reinforced samples.
PubDate: 2017-10-16
DOI: 10.1007/s40891-017-0111-9
Issue No: Vol. 3, No. 4 (2017)

• Full-Scale Laboratory Accelerated Test on Geotextile Reinforced Unpaved
• Authors: G. S. Ingle; S. S. Bhosale
PubDate: 2017-09-30
DOI: 10.1007/s40891-017-0110-x
Issue No: Vol. 3, No. 4 (2017)

• Combined Use of Jute Geotextile-EPS Geofoam to Protect Flexible Buried
Pipes: Experimental and Numerical Studies
• Authors: Y. Z. Beju; J. N. Mandal
Abstract: This paper addresses the results of the experimental and numerical studies conducted on 4.2 mm thickness and 110 mm diameter high-density polyethylene (HDPE) pipes buried in fly ash material overlying stone dust beds. The model tests were performed using single and double layers of expanded polystyrene (EPS) geofoam as compressible inclusions. In addition to that, jute geotextile was used as a reinforcement for the infill fly ash along with EPS geofoam inclusion to obtain induced trench condition. The test beds were subjected to loading on the fly ash surface with the help of a rigid steel plate to simulate as a strip footing in different embedment depths of the pipe (1–3 times pipe diameter). The test results revealed that the pressure and strain values in the pipe reduced significantly in the presence of EPS geofoam and jute geotextile related to the location of the pipe. In the case of double layers of EPS geofoam could induce reduction of the pressure up to 87.2% and strain about 63.5% respectively depending on the density and width of EPS geofoam. Whereas, at the same burial depth, in the presence of jute geotextile together with EPS geofoam can be reduced up to 93.8 and 73.4% for pressure and strain respectively depending on EPS geofoam density and number of reinforcement. Moreover, the jute geotextile-EPS geofoam combination of model test results were validated with finite element program. A good agreement was observed on pressure-settlement response and pipe strain between experimental and numerical investigations. The numerical studies show that the jute geotextile distributes stresses in the lateral direction and then the stresses on the pipe significantly reduced.
PubDate: 2017-09-30
DOI: 10.1007/s40891-017-0107-5
Issue No: Vol. 3, No. 4 (2017)

• Utilizing PVDs to Provide Shear Strength to Saturated Fine-Grained
Foundation Soils
• Authors: Robert M. Koerner; Maxwell R. Koerner; George R. Koerner
Abstract: This paper describes a major case history failure of 300,000 m3 of soft foundation soil (while being surcharged) that used sand drains to shorten the consolidation time. It occurred in 1960 and has never been reported in the open literature. Using data from this case history a computer analysis is used illustrating the situation and concerns involved. With the advent of prefabricated vertical drains, the hypothetical installation of PVDs is counterpointed to this same sand drain case history showing how factors-of-safety are increased. Used are laboratory generated tensile strengths of commercial PVDs at various angles using a special apparatus developed for the first time and reported herein. The factors-of-safety against the actual case history foundation soil failure increases by approximately 4% using commercially available PVDs at typical spacings. Using stronger PVDs and/or closer spacings there is no limit as to potential increases in factors-of-safety. To the authors knowledge this is the first time that PVDs used for site drainage have been considered as reinforcement materials insofar as foundation soil stability is concerned. We hope that further advances can be made in this regard.
PubDate: 2017-09-27
DOI: 10.1007/s40891-017-0108-4
Issue No: Vol. 3, No. 4 (2017)

• Geosynthetic Protection for Buried Pipes Subjected to Surface Surcharge
• Authors: Ana Carolina Gonzaga Pires; Ennio Marques Palmeira
Abstract: Geosynthetics have been extensively used as reinforcement in several geotechnical engineering applications. Regarding pressurised buried pipes, geosynthetics can protect the pipe against mechanical damages and reduce the consequences of explosions and leakages. This paper presents and discusses the use of geosynthetic reinforcement for the protection of buried pipes against the influence of localized surcharges on the ground surface. Model tests were carried out under plane-strain conditions where increasing surcharge pressures were applied on the surface of a dense sand layer containing a buried pipe. Three polymeric geogrids were used as reinforcements. Reinforcement arrangements consisting of a geogrid horizontal layer, an inverted U arrangement and an arrangement where the geogrid completely enveloped the pipe were tested. The results obtained showed that the presence of the reinforcement was effective in reducing the vertical stresses transferred to the pipe as well as in reducing pipe strains. The arrangement with the geogrid enveloping the pipe was the most efficient and the geogrid that combined satisfactory tensile stiffness and aperture to soil particle diameter ratio was the one which performed best. The testing programme showed the potentials for the use of geosynthetic reinforcement in reducing the effects of surface surcharges on buried pipes.
PubDate: 2017-09-22
DOI: 10.1007/s40891-017-0109-3
Issue No: Vol. 3, No. 4 (2017)

• Use of ANN and Neuro Fuzzy Model to Predict Bearing Capacity Factor of

• Authors: R. Sahu; C. R. Patra; N. Sivakugan; B. M. Das
Abstract: Laboratory model tests have been conducted on a strip foundation resting over multi-layered geogrid-reinforced dense and loose sand subjected to inclined load. In this study, two different approaches are proposed, namely, artificial neural network (ANN) and Adaptive Neuro Fuzzy Inference system (ANFIS) to determine the reduction factor for ultimate bearing capacity of shallow foundations on reinforced soil. Firstly, ANN model is proposed to determine the reduction factor which can be used to estimate the ultimate bearing capacity of an inclined loaded foundation from the ultimate bearing capacity of a vertically loaded foundation. A thorough sensitivity analysis was carried out to find out the important parameters affecting the reduction factor. The results from ANN were compared with the laboratory model test results and these results are in good agreement. Secondly, ANFIS is proposed to determine the reduction factor. A neuro fuzzy system is a fuzzy system that uses a learning algorithm derived from neural network theory to determine its parameters by processing data samples. Performance of neurofuzzy model was comprehensively evaluated with that of independent ANN model developed using the same data. The values of the performance evaluation measures such as coefficient of correlation, root mean square error, coefficient of efficiency, mean bias error obtained through the neurofuzzy model are found to be good, which reveals that the neurofuzzy model can be effectively used for the bearing capacity prediction.
PubDate: 2017-09-13
DOI: 10.1007/s40891-017-0102-x
Issue No: Vol. 3, No. 3 (2017)

• Ultimate Capacity of Battered Pile Groups Subjected to Oblique Pullout
• Authors: Tanvi Singh; Mahesh Pal; V. K. Arora
Abstract: A testing program comprising 250 oblique pullout tests was conducted to study the effect of variable parameter on pullout capacity of batter pile groups in sand. Test was conducted in laboratory on five pile groups. Model piles consist of aluminium having three length 0.40, 0.60, 0.90 m at two unit weights 16.28 and 15.79 kN/m3. Two pile surfaces were tested and angle of oblique load was kept at 0°, 10°, 20°, 30°,45º. Analysis of results indicates that increasing value of pile length, sand unit weight, and surface roughness increases the the pullout capacity of oblique piles. Increasing angle of oblique load from horizontal also increases the oblique pullout capacity for batter pile group but have no significant difference at lower angle of oblique load. Difference in oblique load caring capacity for each pile length, unit weight and surface roughness became significant at higher angle of oblique load. ANOVA single factor test indicate except pile surface other parameter viz length, unit weight and angle of oblique load significantly affect oblique load caring capacity.
PubDate: 2017-08-20
DOI: 10.1007/s40891-017-0103-9
Issue No: Vol. 3, No. 3 (2017)

• Comparative Study of Measured Suction in Fine-Grained Soil Using Different
In-Situ and Laboratory Techniques
• Authors: Danial Esmaili; Kianoosh Hatami
Abstract: This paper presents a comparison between soil suction test results for a lean clay (CL) using four different measurement techniques, which included thermal conductivity sensors, in-situ psychrometers, a dew-point potentiometer and filter paper. The primary objective of these tests was to evaluate and compare the performance of these techniques and to demonstrate the sensitivity of the measured suction data to the quality of contact between the soil and the sensor, and measurement time and procedure, which could lead to orders of magnitude difference between the anticipated and measured results. The tests using a dew-point potentiometer and thermal conductivity sensors were carried out at different gravimetric water content values (referred to as moisture content in this paper) within the ranges of 10–23% and 8–24%, respectively, which were significantly above and below the optimum moisture content (OMC) of 18%. However, those using in-situ psychrometers and filter paper were carried out for moisture contents between OMC − 2% and OMC + 2%, as part of model embankment tests that were constructed at those moisture contents. Results of the study indicate that the in-situ psychrometer data were consistent with the soil water characteristic curve established using the dew-point potentiometer. However, thermal conductivity sensors and filter paper test data showed significant sensitivity to the quality of contact with the surrounding soil and measurement time and procedure, respectively, resulting in orders of magnitude deviations from the otherwise consistent in-situ psychrometer and dew-point potentiometer readings for the lean clay examined in this study. Findings of this study highlight the challenges involved, and level of care and due attention required in sensor installation and the testing procedure in order to obtain satisfactory suction data in unsaturated soils.
PubDate: 2017-08-17
DOI: 10.1007/s40891-017-0104-8
Issue No: Vol. 3, No. 3 (2017)

• Numerical Analyses of Loaded Strip Footing Resting on Cellular Mattress
and Strips: Reinforced Fly Ash Slope
• Authors: Maheboobsab B. Nadaf; J. N. Mandal
Abstract: In this paper, unreinforced and cellular reinforced fly ash slopes were analyzed using numerical modelling to simulate the laboratory model studies by applying similar geometry and reinforcement parameters to understand its deformation behavior on rigid foundation. Small scale laboratory experimental models were performed on fly ash slopes by applying strip loading at a 60° inclination. In the current study an approach was made to use cellular reinforcement (CR) material which is made up of from post-consumer waste plastic water bottles along with steel grid-jute geotextile composite reinforcement at slope facia. A numerical analyses using finite-element analysis (FEA) PLAXIS 3D was conducted to validate the experimental laboratory model test results. In FEA, fly ash as backfill material and reinforcing materials like steel grid-jute geotextile and cellular/geocell reinforcement were modeled systematically. Here, fly ash modeled with Mohr–Coulomb failure criteria as linear elastic plastic material and, for cellular/geocell reinforcement it was modeled as elastoplastic material. The numerical model analyses were consistently substantiated with experimental results. Parametric analysis were conducted by using validated numerical model to evaluate the influence of various cellular properties along with steel grid-jute geotextile composite reinforcement on the performance of reinforced fly ash slopes. The numerical finite element simulation (FES) results are in good agreement with the model test results.
PubDate: 2017-08-16
DOI: 10.1007/s40891-017-0106-6
Issue No: Vol. 3, No. 3 (2017)

• Pull-Out Behaviour of Square Anchor Plates in Reinforced Soft Clay
Abstract: Anchor plates are generally used for structures like transmission towers, mooring systems, etc. where the uplift and lateral forces are expected to be predominant. The capacity of anchor plate can be increased by increasing the size of the plate, depth of embedment and grouping of anchors. However due to space constraints, it was found that use of geosynthetic can be beneficial in increasing the uplift capacity without altering size of plates. Most of the past research in this area focused on the response of plate anchors in cohesionless type of soil. In the present study it was aimed to determine the uplift capacity of the anchor plates in cohesive type of soils with geosynthetic reinforcement. Numerical simulations were carried out on three different sizes of square anchor plates using general-purpose finite element software ABAQUS. Material non-linearity was considered in the analysis using hypoelastic model. For reinforcement, a single layer geosynthetic was placed at three different positions from the plate. The effects of various parameters such as, embedment ratio, position of reinforcement and width of reinforcement has been studied. Results obtained from the numerical analysis were compared with the previously published experimental results for various conditions. It was also observed that the inclusion of reinforcement results in a shift in overall failure behaviour of plate anchors. Parametric study involving the embedment depth, position of reinforcement in embedded soil indicates the significant role in the behaviour of anchor plates in reinforced soil in terms of ultimate pull-out capacity. The uplift capacity was expressed in terms of dimensionless breakout factor. A formulation for breakout factor has been proposed for different embedment ratio of anchors in reinforced soils.
PubDate: 2017-08-14
DOI: 10.1007/s40891-017-0101-y
Issue No: Vol. 3, No. 3 (2017)

• Behaviour of Bamboo–Geogrid Reinforced Fly Ash Wall Under Applied
• Authors: A. W. Mekonnen; J. N. Mandal
Abstract: This technical note presents results of model tests performed on bamboo geogrid reinforced fly ash walls under applied strip load. The effect of vertical spacing and length of bamboo geogrid mattresses and strips on the deformation behavior of the model walls was studied and discussed. The results demonstrated the effect of increase in length and coverage ratios and decrease in vertical spacing of reinforcements on the improved performance of the model walls, including increased failure surcharge pressure, reduced facing displacement and backfill settlement. The failure surcharge pressure compared with the unreinforced model wall was improved by 185.76 and 311.84% for bamboo geogrid strips and mattresses respectively when vertical spacing and length of reinforcement used were 20 and 65% of the wall height respectively.
PubDate: 2017-08-14
DOI: 10.1007/s40891-017-0105-7
Issue No: Vol. 3, No. 3 (2017)

• Geotextile Tube Assessment Using Hanging Bag Test Results of Dairy Sludge
• Authors: Pooja Deepak Pawar; Ankita Kumar; S. K. Ahirwar; J. N. Mandal
Abstract: Geotextile tube is an innovative product developed by sewing permeable high strength geotextiles to form large tubes. The main application of geotextile tube is dewatering of dredged materials sediments and industrial waste slurry. The present study describes the performance of dairy sludge dewatering using hanging bag test. The effect of the addition of coagulant has been studied. Alum was used as a coagulant. Dewatering was carried out for dairy sludge without the addition of alum and dairy sludge mixed with alum. The environmental analysis was carried out of the sludge before and after hanging bag test to study the quality of filtrate. Also, analysis of filter cake was done to check its suitability for reuse thus proving zero waste condition. It was found that geotextile tube was efficient in dewatering the sludge and its efficiency increases with the addition of a coagulant. Dairy sludge dewatering without the addition of alum showed the maximum flow rate of 4.95 cm3/sec and dewatering time of 2280 min as compared to dairy sludge dewatering with the addition of alum which showed the maximum flow rate of 7.66 cm3/sec and dewatering time of 2160 min.
PubDate: 2017-08-07
DOI: 10.1007/s40891-017-0100-z
Issue No: Vol. 3, No. 3 (2017)

• Empirical Correlations with Standard Penetration Test (SPT)-N for
Estimating Shear Wave Velocity Applicable to Any Region
• Authors: Arjun Sil; Jyotirmoy Haloi
Abstract: Shear wave velocity is one of the most important parameters for determining dynamic soil properties as well as for site characterization. Though there are several field tests to measure the shear wave velocity (V s ) but these are not always feasible. Hence, it is preferable to measure V s indirectly through empirical equations correlating V s with SPT-N value. Although, there are a number of empirical equations developed but these are region specific and cannot be used for all regions. In this paper, an effort has been made to develop new common empirical equations (considering different types of soil) correlating V s and SPT-N value, based on the existing correlations available for different continents collected almost from all regions which will be applicable to any region of the world. Empirical equations have been selected for analysis purpose from 41 different authors published worldwide, where, 26 equations are proposed for all soil types, 25 for sand and 14 are for clay type soil. These equations are selected separately and statistical regression analyses have been carried out to develop new common correlations for each type of soil. The newly developed equations have shown best fit curves with a very high R 2 values, along with minimum variance. As a result, it could be concluded that these newly developed correlations would be very much useful for determining shear wave velocity from known SPT-N value applicable to any region.
PubDate: 2017-08-02
DOI: 10.1007/s40891-017-0099-1
Issue No: Vol. 3, No. 3 (2017)

• Geosynthetic Liner as Foundation Isolation for Seismic Protection
• Authors: R. P. Nanda; S. Dutta; A. Das; H. A. Khan
Abstract: The effectiveness of a nonwoven geotextile–geomembrane liner as a foundation isolation system for RC buildings is studied analytically by considering artificial as well as recorded accelerogram as earthquake ground input motion. The concept of foundation isolation is applied by separating the foundation from the soil by a sliding friction interface in the form of geotextile–UHMWPE. A 3D finite element simulation and parametric study in ABAQUS have been carried out to estimate the effectiveness of the proposed method. The results show that through slip deformation, the interface reduces seismic energy transferred, reducing the dynamic response of the building. On an average, the proposed scheme can reduce the horizontal ground acceleration by 40%.
PubDate: 2017-07-14
DOI: 10.1007/s40891-017-0098-2
Issue No: Vol. 3, No. 3 (2017)

• Effect of Geocell Geometry and Multi-layer System on the Performance of
Geocell Reinforced Sand Under a Square Footing
• Authors: K. S. Sherin; S. Chandrakaran; N. Sankar
Abstract: A series of the experimental testing program was carried out to determine the influence of cell geometry and multi-layer system on the behaviour of a square footing resting on geocell reinforced sand. Geocells made of three different PVC polymers of varying thickness and strength were used for testing purpose. Laboratory plate load tests were conducted to determine the pressure–settlement response of reinforced soil for different geometric parameters like diameter, height, depth of placement, and shape of the geocell. The effect of geocell material strength on load carrying capacity is also included in this paper. Performance comparison of single layer and multi-layer geocell reinforced sand with different spacing is also presented in this paper. The test results confirm that the reinforced sand layer shows an excellent improvement in bearing capacity in comparison with the unreinforced sand. The optimum geocell geometry to get maximum benefit in terms of bearing capacity were determined and presented in this paper. Optimum spacing for a two layer geocell system was also determined experimentally and presented in this paper.
PubDate: 2017-07-04
DOI: 10.1007/s40891-017-0097-3
Issue No: Vol. 3, No. 3 (2017)

• Influence of Critical Parameters on the Peak Pullout Resistance of Soil
Nails Under Different Testing Conditions
• Authors: Cheng-Yu Hong; Zi-Xiong Liu; Yi-Fan Zhang; Meng-Xi Zhang; Lalit Borana
Abstract: This paper presents a comprehensive analysis of the correlation between influencing parameters and peak pullout resistance (PPR) of soil nails installed in typical completely decomposed granite (CDG) or sand. A total of eight soil nail pullout tests were conducted in a field to examine the influence of overburden pressure (OP) and grouting pressure (GP) on the PPR of soil nails. Comparative analysis indicates PPR values of soil nails pulled out in soils with low degrees of saturation (30%) are almost twice of that in almost fully saturated soils. Apparent coefficient of friction (ACF) increases linearly as the increase of GP, but decreases linearly as the increase of OP when GP is constant in both laboratory and field tests. Extensive studies also show that the magnitude of normalized ACF is more sensitive to OP compared with GP and degree of saturation (Sr). Diameter increase in percentage of soil nails pulled out from field are almost twice of the soil nail diameters in laboratory tests, indicating that due to complex geological condition in field (such as possible high void ratio of field soils), failure surface of soil nails presents substantial shift into surrounding soils.
PubDate: 2017-06-07
DOI: 10.1007/s40891-017-0095-5
Issue No: Vol. 3, No. 2 (2017)

• Predicting Compaction Characteristics of Fine-Grained Soils in Terms of
Atterberg Limits
• Authors: Ankurjyoti Saikia; Debankur Baruah; Kaushik Das; Hirak Jyoti Rabha; Anirjit Dutta; Anupjyoti Saharia
Abstract: This study presents a set of regression models for predicting maximum dry unit weight $$({\gamma _{{\text{dmax}}}})$$ and optimum moisture content (OMC) of fine-grained soils in terms of their consistency limits. The empirical models were developed by performing experimental investigation on forty (40) natural fine-grained soils, encompassing a wide range of liquid limit (LL) and plastic limit (PL). The compaction characteristics were determined by conducting IS light compaction test (standard Proctor equivalent in Indian standards). Observation shows that $${\gamma _{{\text{dmax}}}}$$ linearly decreases and in contrast, OMC increases in the same fashion with increase in LL or PL. However, in terms of regression coefficient, LL exhibits a superior correlation with $${\gamma _{{\text{dmax}}}}$$ and OMC than PL does. The observed variation trend of compaction characteristics with LL and PL is affirmed by a few previous studies in the domain. A set of two independent models are finally developed for predicting $${\gamma _{{\text{dmax}}}}$$ and OMC of soils taking both LL and PL into account. Reasonably good regression coefficients are obtained in case of both the models (R 2 = 0.90 in case of $${\gamma _{{\text{dmax}}}}$$ and R 2 = 0.86 in case of OMC model). The models are validated by predicting $${\gamma _{{\text{dmax}}}}$$ and OMC and comparing with actually measured values in a published study as well as present study. The root-mean-square error (RMSE) in case of $${\gamma _{{\text{dmax}}}}$$ prediction is 2.1% against the measured values of present study and 7.4–7.5% against measured values in literature. The RMSE involved in case of OMC prediction model is 7% against present values and 17.5–28.2% against measured values in literature.
PubDate: 2017-06-02
DOI: 10.1007/s40891-017-0096-4
Issue No: Vol. 3, No. 2 (2017)

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