Subjects -> TRANSPORTATION (Total: 214 journals)
    - AIR TRANSPORT (9 journals)
    - AUTOMOBILES (26 journals)
    - RAILROADS (10 journals)
    - ROADS AND TRAFFIC (9 journals)
    - SHIPS AND SHIPPING (43 journals)
    - TRANSPORTATION (117 journals)

TRANSPORTATION (117 journals)                     

Showing 1 - 53 of 53 Journals sorted alphabetically
Accident Analysis & Prevention     Hybrid Journal   (Followers: 128)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 8)
Applied Mobilities     Hybrid Journal   (Followers: 5)
Asian Transport Studies     Open Access   (Followers: 1)
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Case Studies on Transport Policy     Hybrid Journal   (Followers: 13)
Cities in the 21st Century     Open Access   (Followers: 17)
Communications in Transportation Research     Open Access  
Danish Journal of Transportation Research / Dansk Tidsskrift for Transportforskning     Open Access   (Followers: 1)
Decision Making : Applications in Management and Engineering     Open Access   (Followers: 1)
Economics of Transportation     Partially Free   (Followers: 16)
Emission Control Science and Technology     Hybrid Journal   (Followers: 1)
eTransportation     Open Access   (Followers: 1)
EURO Journal of Transportation and Logistics     Open Access   (Followers: 12)
European Journal of Transport and Infrastructure Research (EJTIR)     Open Access   (Followers: 1)
European Transport Research Review     Open Access   (Followers: 22)
Geosystem Engineering     Hybrid Journal  
IATSS Research     Open Access  
IEEE Open Journal of Intelligent Transportation Systems     Open Access   (Followers: 4)
IEEE Vehicular Technology Magazine     Full-text available via subscription   (Followers: 7)
IET Electrical Systems in Transportation     Open Access   (Followers: 13)
IET Intelligent Transport Systems     Open Access   (Followers: 11)
IET Smart Cities     Open Access  
IFAC-PapersOnLine     Open Access  
International Journal of Applied Logistics     Full-text available via subscription   (Followers: 5)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 10)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 8)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 6)
International Journal of Intelligent Transportation Systems Research     Hybrid Journal   (Followers: 13)
International Journal of Mobile Communications     Hybrid Journal   (Followers: 8)
International Journal of Ocean Systems Management     Hybrid Journal   (Followers: 1)
International Journal of Physical Distribution & Logistics Management     Hybrid Journal   (Followers: 11)
International Journal of Services Technology and Management     Hybrid Journal   (Followers: 1)
International Journal of Sustainable Transportation     Hybrid Journal   (Followers: 18)
International Journal of Traffic and Transportation Engineering     Open Access   (Followers: 12)
International Journal of Transportation Engineering     Open Access   (Followers: 2)
International Journal of Transportation Science and Technology     Open Access   (Followers: 9)
International Journal of Vehicle Systems Modelling and Testing     Hybrid Journal   (Followers: 2)
Journal of Advanced Transportation     Hybrid Journal   (Followers: 12)
Journal of Big Data Analytics in Transportation     Hybrid Journal   (Followers: 2)
Journal of Intelligent and Connected Vehicles     Open Access   (Followers: 1)
Journal of Mechatronics, Electrical Power, and Vehicular Technology     Open Access   (Followers: 6)
Journal of Modern Transportation     Full-text available via subscription   (Followers: 7)
Journal of Navigation     Hybrid Journal   (Followers: 176)
Journal of Sport & Social Issues     Hybrid Journal   (Followers: 10)
Journal of Supply Chain Management Science (JSCMS)     Open Access   (Followers: 3)
Journal of Traffic and Transportation Engineering (English Edition)     Open Access   (Followers: 4)
Journal of Transport & Health     Hybrid Journal   (Followers: 12)
Journal of Transport and Land Use     Open Access   (Followers: 26)
Journal of Transport and Supply Chain Management     Open Access   (Followers: 10)
Journal of Transport Geography     Hybrid Journal   (Followers: 22)
Journal of Transport History     Hybrid Journal   (Followers: 12)
Journal of Transportation and Logistics     Open Access   (Followers: 3)
Journal of Transportation Safety & Security     Hybrid Journal   (Followers: 9)
Journal of Transportation Security     Hybrid Journal   (Followers: 3)
Journal of Transportation Technologies     Open Access   (Followers: 13)
Journal of Waterway Port Coastal and Ocean Engineering     Full-text available via subscription   (Followers: 7)
Journal on Vehicle Routing Algorithms     Hybrid Journal  
Les Dossiers du Grihl     Open Access   (Followers: 1)
LOGI ? Scientific Journal on Transport and Logistics     Open Access  
Logistics     Open Access   (Followers: 1)
Logistics & Sustainable Transport     Open Access   (Followers: 4)
Logistique & Management     Hybrid Journal  
Maritime Transport Research     Open Access  
Mobility in History     Full-text available via subscription   (Followers: 7)
Modern Transportation     Open Access   (Followers: 11)
Nonlinear Dynamics     Hybrid Journal   (Followers: 19)
Open Journal of Safety Science and Technology     Open Access   (Followers: 16)
Open Transportation Journal     Open Access   (Followers: 1)
Packaging, Transport, Storage & Security of Radioactive Material     Hybrid Journal   (Followers: 2)
Periodica Polytechnica Transportation Engineering     Open Access  
Pervasive and Mobile Computing     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit     Hybrid Journal   (Followers: 11)
Promet : Traffic &Transportation     Open Access  
Public Transport     Hybrid Journal   (Followers: 18)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Research in Transportation Business and Management     Partially Free   (Followers: 4)
Revista Transporte y Territorio     Open Access  
Romanian Journal of Transport Infrastructure     Open Access   (Followers: 1)
Sport, Education and Society     Hybrid Journal   (Followers: 12)
Sport, Ethics and Philosophy     Hybrid Journal   (Followers: 2)
Streetnotes     Open Access   (Followers: 2)
Synthesis Lectures on Mobile and Pervasive Computing     Full-text available via subscription   (Followers: 1)
Transactions on Transport Sciences     Open Access   (Followers: 4)
Transport     Open Access   (Followers: 16)
Transport and Telecommunication     Open Access   (Followers: 4)
Transport in Porous Media     Hybrid Journal  
Transport Problems     Open Access   (Followers: 4)
Transport Reviews: A Transnational Transdisciplinary Journal     Hybrid Journal   (Followers: 11)
Transportation     Hybrid Journal   (Followers: 32)
Transportation Engineering     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation in Developing Economies     Hybrid Journal  
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Transportation Journal     Full-text available via subscription   (Followers: 16)
Transportation Letters : The International Journal of Transportation Research     Hybrid Journal   (Followers: 4)
Transportation Research Interdisciplinary Perspectives     Open Access   (Followers: 2)
Transportation Research Part A: Policy and Practice     Hybrid Journal   (Followers: 38)
Transportation Research Part B: Methodological     Hybrid Journal   (Followers: 38)
Transportation Research Part C: Emerging Technologies     Hybrid Journal   (Followers: 29)
Transportation Research Procedia     Open Access   (Followers: 6)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 29)
Transportation Safety and Environment     Open Access   (Followers: 1)
Transportation Science     Full-text available via subscription   (Followers: 25)
Transportation Systems and Technology     Open Access  
TRANSPORTES     Open Access   (Followers: 3)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 7)
Transportmetrica B : Transport Dynamics     Hybrid Journal   (Followers: 1)
Travel Behaviour and Society     Full-text available via subscription   (Followers: 9)
Travel Medicine and Infectious Disease     Hybrid Journal   (Followers: 2)
Urban, Planning and Transport Research     Open Access   (Followers: 33)
Vehicles     Open Access  
Vehicular Communications     Full-text available via subscription   (Followers: 4)
World Electric Vehicle Journal     Open Access   (Followers: 3)
World Review of Intermodal Transportation Research     Hybrid Journal   (Followers: 5)
Транспортні системи та технології перевезень     Open Access  

           

Similar Journals
Journal Cover
Transportation Infrastructure Geotechnology
Journal Prestige (SJR): 0.592
Citation Impact (citeScore): 1
Number of Followers: 8  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2196-7202 - ISSN (Online) 2196-7210
Published by Springer-Verlag Homepage  [2469 journals]
  • Dr. Suraparb Keawsawasvong of Thammasat University Is the Winner for the
           2021 Fumio Tatsuoka Best Paper Award

    • Free pre-print version: Loading...

      PubDate: 2022-06-01
       
  • Correction to: Improvement in Field CBR Values of Subgrade Soil Using
           Construction-Demolition Materials

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      Abstract: A Correction to this paper has been published: https://doi.org/10.1007/s40515-021-00176-5
      PubDate: 2022-06-01
       
  • Numerical Analysis of the Dynamic Behavior of Shallow Tunnel: a Case Study
           of Djebel El-Ouahch Tunnel, Algeria

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      Abstract: The study of the seismic behavior of tunnels has become a major concern for geotechnicians in recent years, especially after the collapse of the many underground structures around the world, constructed in soft ground at shallow depths. Several studies focused on the distortion of the tunnel cross section caused by shear waves which propagate vertically to the tunnel axis. However, the study of the tunnel seismic response to the compression waves which propagate parallel to the axis of the tunnel is almost neglected. These compression waves can cause a serious axial and bending deformation in the tunnel lining. Therefore, this paper aims to present a numerical analysis of part of the T1 tunnel of the Algerian East-West Highway, in the province of Constantine, that suffered a very significant damage caused by a sudden collapse. The goal is to demonstrate the influence of seismic waves of compression as well as the effect of embedment depth on the behavior of the lining of the tunnel and its surrounding soils. The study was performed using a 3D finite difference calculation method (FDM) using the FLAC3D calculation code. The nonlinear soil is considered by using Hardin-Drnevich model of the hysteretic damping and an elastoplastic model of Mohr-Coulomb. The results were presented in terms of horizontal stresses, shear stresses, horizontal displacements, and shear strains developed at the level of the two elements of the tunnel (lining, soil). The results show that the most affected parts of the tunnel are the concrete of the side wall, the tunnel raft, and their surrounding soil. These results suggest the appearance of cracks at those locations. In other hand, the results show that when decreasing the tunnel depth, the horizontal tensile stresses increase, which causes the reduction of the shear strength of the soil mass and the lining. Consequently, they cause the failure of the soil-tunnel system, increasing the risk of damage instability of the tunnel. In addition, increasing the depth reduces greatly the horizontal tensile stresses and contributes to the stability of the soil-tunnel system. Finally, the novelty of the work is the study of the impact of seismic compression waves by the application of the FDM to evaluate the behavior of a real case of damaged tunnel.
      PubDate: 2022-06-01
       
  • Stability Analysis of Layered Soil Slope Using Truncated Pile with
           Numerical Solution

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      Abstract: Available literature reveals that the use of truncated pile would be a good solution to increase the stability of slope which is introduced to date for homogeneous soil. Here an attempt is made to perform both experimental and numerical studies introducing truncated piles in layered soil. Both top and bottom layers are cohesive-friction soil. The sand layer is sandwiched between these layers. The influential factors include water content variation, frequency of base shaking, types of reinforcement used, and depth of the truncation. Slopes are manually prepared and tested using a shake table instrument. The horizontal deformation, root means square acceleration, and crest deformation are evaluated and shown at different water content, frequency, and types of reinforcement. In practical engineering, the piles could be truncated reasonably while ensuring the reinforcement effect. The truncated part of piles is filled with the cement sand mortar. A 2D finite element analysis has been done to validate the results obtained from the experimental investigations. The results show that the introduction of truncated piles increases the stability of the slope. Also, the more increase in the truncated part of the pile, the more will be the effectiveness of the pile.
      PubDate: 2022-06-01
       
  • Investigating the Effects of Underground Structures on the Scattering of
           Seismic Waves Reaching the Ground Surface

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      Abstract: The realistic understanding of the scattering of unground structure-induced seismic waves, known as amplifications on the ground, can lead to the design of safe and strong structures on the ground. In the present study, FLAC Software is applied to investigate different models of the Daikai subway station, which was heavily damaged in the 1995 Kobe earthquake. The responses of the ground were analyzed with and without the structure to examine the phenomenon of amplification. The results show the maximum amplification of 2.2 recorded in the middle point of the structure, while the maximum acceleration peak was recorded in a point adjacent to the edge of the structure. Among different points in soil layers, those that were in contact with the structure experienced the highest enhancements compared to the case without the structure. In the next step, different models of the structure with the central column thicknesses of 10–70 cm were developed to investigate the lateral displacements of the structure. The results indicated that the maximum lateral displacement of the structure between the maximum and minimum thicknesses was smaller than 10 mm.
      PubDate: 2022-06-01
       
  • Effect of Adjacent Support Condition on Premature Wood Crosstie Failure

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      Abstract: Railroad crossties (sleepers) are a key component of the track structure and play an important role in the support of the track structure and the distribution of train loading through the track. The condition of the crossties has been traditionally monitored by visual inspection, which has, in recent years, been supplemented with automated crosstie inspection systems. These provide more accurate information about the condition of each individual crosstie and as such are important in planning and optimizing tie replacement. By using inspection data taken from the same track in different years, it is possible to determine the degradation of ties, and corresponding life of the ties, and to develop improved tie life models that take into account local conditions. The aim of this paper is to provide a method to predict and model tie life based on support condition, as defined by the condition of adjacent crossties. Tie life is modeled using mathematical techniques, such as piecewise reconstruction which allows for the determination of the probability of tie failure as a function of loss of support. The analysis approach, using Dijkstra’s algorithm and Markov chains, is based on the use of tie condition data from two different inspections performed over a span of 3 years. The dataset, which consists of approximately 100,000 ties, included tie inspection data for inspections carried out on the same track during the period 2016 to 2019. Ties are grouped based on their support condition, specifically the loss of support associated with the presence of poor or failed ties on either side of the study tie. The results present average tie life as a function of different support conditions and confirm the fact that loss of support contributes measurably to premature tie failure. This reduction in tie life is presented as a function of tie support condition and compared to earlier studies.
      PubDate: 2022-06-01
       
  • Evaluation of Fracture Energy Parameters for Predicting Moisture-Induced
           Damage in Asphalt Mixes

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      Abstract: Standard methods of screening asphalt mixes for moisture-induced damage are mostly empirical. These methods have not advanced with the same pace as new materials such as polymer-modified asphalt binders, Warm Mix Asphalt (WMA), and mixes containing Reclaimed Asphalt Pavement (RAP) were introduced to asphalt industry. This study was undertaken to assess the effectiveness of fracture energy parameters in capturing the moisture-induced damage potential of major groups of mixes, namely WMA, those containing RAP, and those containing an anti-strip agent. Plant-produced mixes consisting of an asphalt mix containing 1% hydrated lime, another containing 20% RAP, and a WMA mix containing 0.5% of a chemical WMA additive were evaluated by conducting indirect tension, semicircular bend, and indirect tensile asphalt cracking test before and after moisture-conditioning. Different parameters, namely tensile strength ratio, fatigue index, toughness index, critical strain energy release rate, and cracking tolerance index were determined. Binder bond strength tests were also conducted on a wide range of aggregates, asphalt binders, and additives. A novel approach that combined mix volumetric properties with adhesion measurements was used to determine the moisture susceptibility of mixes. The new method as a quick, inexpensive, and effective approach was found to have the potential to be used for screening mixes for stripping before producing them. Fracture energy parameters, while an excellent tool for evaluating the ductility of the mix, were not found to isolate the effect of moisture on mixes or capture stripping mechanism.
      PubDate: 2022-06-01
       
  • Seismic Response of the Ground Surface Including Underground
           Horseshoe-Shaped Cavity

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      Abstract: In this paper, the seismic response of elastic homogeneous ground surface was presented in the presence of unlined horseshoe-shaped underground cavities subjected to obliquely propagating incident SH-waves by using the time-domain half-plane boundary element method (BEM). The Ricker wavelet was considered for the incident wave function. In the use of the proposed method, the boundary around the tunnel was only required to be discretized. After comparing the results of the present study with existing analytical responses, it was found that the method had good accuracy in modeling horseshoe-shaped tunnels. The responses are presented as two-/three-dimensional diagrams in the time/frequency domain. Also, a comparative study is carried out between circular and horseshoe cross-sections to observe the effect of the geometry on the response pattern. The results show that the existence of subsurface openings as well as horseshoe-shaped cavities has a significant effect on the variation of seismic patterns and critical states of the ground surface. The used method can be proposed to geotechnical engineers for preparing simple underground models to achieve the transient responses.
      PubDate: 2022-06-01
       
  • Design Charts for Geogrid-Reinforced Granular Working Platform for Heavy
           Tracked Plants over Clay Subgrade

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      Abstract: Abstract This study investigates the bearing capacity of a geogrid-reinforced granular working platform for heavy tracked plants on clay subgrade using a 2D plane strain finite element method. It substantially extends a case study investigated by incorporating wider soil parameters, depth-to-width ratios and geogrid stiffness modulus. The developed models are first verified by comparing them with the published literature and found to be in good agreement. The parametric modelling results are then used to develop a comprehensive set of design charts with non-dimensional parameters, bearing capacity ratio verses shear strength ratio, so that they can be directly used by practitioners. With the help of a design example, minimum design thickness of the granular working platform is compared and benchmarked with other established design methods. The results show that the proposed design charts and methods are comparable and provide reasonable predictions for the bearing capacity and working platform design thicknesses. A design example shows that thickness of the geogrid-reinforced granular base could be reduced from 1.2 to 55.6% for different geogrid strengths whereas the reduction is very nominal for soft geogrids ranging from only 1.2 to 3.0%.
      PubDate: 2022-05-06
       
  • Dynamic Slope Stability Subject to Blasting Vibrations: a Case Study of
           the Jakarta-Bandung High-Speed Railway Tunnel

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      Abstract: Abstract This paper aims to evaluate dynamic slope stability induced by tunnel blast vibration with the help of a combination of geoelectrical techniques (e.g., vertical electrical sounding and electrical resistivity tomography), geotechnical methods (e.g., boreholes, Standard Penetration Test), and laboratory testing to characterize the subsurface conditions of a rock slope near residential houses in the Padalarang sub-district, West Bandung Regency, Indonesia, that is subjected to tunnel blast vibration. The slope is part of the mountain that will be excavated by a drill-and-blast method to provide a passageway for one of the Jakarta-Bandung high-speed railway tunnels. A series of trial blasts have been carried out and blast vibrations have been recorded, resulting in the linear regressions of the peak vector sum (PVS) and peak particle acceleration (PPA). Based on the allowable charge weights per delay, the PPA regression was then used to predict the acceleration that would result from the tunnel blast. The predicted acceleration was then used to analyze the dynamic stability of the slope using the pseudo-static approach. The slope stability analysis shows that the slope has a dynamic factor of safety of 1.3–1.5, indicating that the slope will be stable after experiencing the vibration induced by the tunnel blast. The results of this study show that combining geoelectrical survey with geotechnical methods could help geotechnical engineers to understand the subsurface condition and its complexity, which play vital roles in assessing the stability of the slope, particularly the slope that is subjected to dynamic loading from a tunnel blast.
      PubDate: 2022-04-19
       
  • Assessment of Embodied Carbon for Geogrid-Reinforced Flexible Pavements

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      Abstract: Abstract The carbon footprint includes emissions over the life cycle of the product, operation, or solution (i.e., including the construction solution). A comparison of carbon footprint calculated for all possible alternative solutions can help to select the most “sustainable” option. Embodied carbon (EC) is an indicator of cumulative carbon emissions used in the solution adopted. Many researchers have reported that geogrids in pavements enhance the life span of pavements or alternatively consume less quantity of material in their construction for the same design life and thus often provide a cost-efficient alternative to traditional construction techniques. The sustainability of pavements may be evaluated by quantifying the EC of pavement structure within the considered life cycle boundary. In this paper, carbon emissions of unreinforced and geogrid-reinforced pavements designed were evaluated by quantifying EC for various cases. EC values of pavements decrease with the increase in the subgrade strength. The total EC value of unreinforced pavement structure were higher (231–368 tCO2e/km) in comparision with that of geogrid-reinforced pavement (161–342 tCO2e/km) for the given traffic, subgrade CBR, and LCR considered in the study. For the parameters considered in the analysis, the reduction in EC of geogrid-reinforced pavements compared with unreinforced pavements ranged from 7 to 24%.
      PubDate: 2022-04-01
       
  • Behavior of Floating Stone Columns and Development of Porewater Pressure
           Under Cyclic Loading

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      Abstract: Abstract The floating stone column is a common and efficient technique that provides confinement to the soft soil and increases its strength and provides short drainage paths for the excess porewater pressure. The present study investigates the effects of several patterns of floating stone columns constructed in soft clay under footing subjected to cyclic loading. The soft soil used in this study has a very low unconfined compressive strength and it was improved by single, two, three, and four in a square and four in a quadrilateral pattern of stone columns. The backfill material of columns is poorly graded sand having a relative density of 65%. The results of physical model tests indicated increasing soil bearing capacity and reduced the excess porewater pressure and settlement. The degree of improvement of geotechnical properties of soft soil increases with increasing the area replacement ratio of stone columns. Generally, the soil samples exhibited two patterns of porewater pressure (PWP) variation with increasing the number of loading cycles. The soil samples reinforced with one and two stone columns showed a linear increase in the PWP with increasing the number of loading cycles, but the soil samples reinforced with three and four columns showed nonlinear decreasing of PWP with a growing number of loading cycles. The four columns in a quadrilateral pattern is better than in a square pattern in improving the geotechnical properties of soft soil subjected to cyclic loading.
      PubDate: 2022-04-01
       
  • Effect of Embedment Depth on Cyclic Behavior of Tank Footings on Dry Sand

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      Abstract: Abstract Fuel tank footings are usually subjected to cyclic loads caused by filling and emptying of these tanks. In addition, in a multitude of geotechnical applications, soils are subjected to cyclic loading. Besides vehicle and traffic loads, cyclic loads also play an important role in pile driving processes and during the dimensioning of foundations for offshore wind craft plants. Research on the cyclic vertical loading problem for sand is particularly scarce, and most has been in commercial confidence. This paper is conducted to study the experimental behavior of dry sandy soil under foundations subjected to vertical cyclic compression load. A total of sixty-three models have been tested to study the behavior of shallow footings under cyclic load of different rates. A new compression machine was manufactured to apply both monotonic and cyclic loading. Three relative densities of sand, two footing shapes, three depths of foundation embedment, and three rates of loading were tried. It was concluded that with more depth of the footing (Df increasing), the soil settlement decreases. In general, when other factors are remaining constant, the bearing capacity of the soil goes on increasing when the depth or width of the foundation increases. The total settlement of a footing continues to increase during the time of the load and reaches a maximum value at the end of dwell time. During the decay period of the load, the footing rebounds to some degree.
      PubDate: 2022-04-01
       
  • Interference of Surface and Embedded Three Strip Footings in Undrained
           Condition

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      Abstract: Abstract The closed-form solutions for the undrained bearing capacity of shallow footing have been derived considering only single footing due to difficulties associated with adding the effect of nearby footings. However, the footing, in reality, may be separated or bounded by other footings from one side or two sides, and hence, the interference effect should be considered. This study has been conducted to understand the influence of the presence of existed footings on the undrained bearing capacity of a new footing that is placed between the existed footings. Validated numerical analyses have been conducted for single and interference footings to clearly understand the effect of the spacing between the footings on the obtained bearing capacity and the associated failure mechanism. The influence of the embedment ratio and the undrained cohesion has also been considered in these analyses to illustrate the combined influence of all of the factors. It was found that the undrained cohesion does not remarkably influence the trend of the relationship of the bearing capacity ratio and the distance ratio between the old and the new footings, while the embedment ratio has been found to have a remarkable impact on the trend of the aforementioned relationship. The average maximum percentage increase of the bearing capacity of the new footing due to the interference effect is found to be ranged between 6% to 23% depending on the embedment ratio and the distance between the footings. Importantly, the embedment ratio is found to influence the critical distance at which the maximum bearing capacity of the new footing is achieved.
      PubDate: 2022-04-01
       
  • Improvement in Field CBR Values of Subgrade Soil Using
           Construction-Demolition Materials

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      Abstract: Abstract Many countries suffer from the stacks of construction and demolition (CD) materials as they cause environmental and health problems in society. The city of Mosul in Iraq suffers from a huge amount of demolition materials resulting from destruction of most of the infrastructure. In the present study, attempts have been made to assess the influence of three types of CD materials (dragged asphalt, DA; crushed brick, CB; and crushed concrete, CC) on the response of a low-plasticity clay (CL) for use as a road subgrade layer. An intensive series of both experimental and numerical studies on the CL with 10% CD materials was carried out using field California bearing ratio (CBR) tests performed in a large-scale model box. The results showed significant improvement in the CBR values upon the addition of CD materials to the CL soil. The CBR values increased by 12.4, 13.7, and 49.7% with the addition of DA, CB, and CC, respectively. The CBR values improved between 1.1 and 1.7 times, corresponding to an increase in the layer thickness from 50 to 100 cm. Further increases in CBR values range from 1.5 to 1.8 times attendant with increasing the thickness of layer from 50 cm to 150 cm. The addition of CC is more active and gives higher CBR values. A good match was observed between the CBR values obtained from the experimental results and the numerical analysis using the PLAXIS 2D package.
      PubDate: 2022-04-01
       
  • An Extension to Barcelona Basic Model Predicting the Behavior of
           Unsaturated Soils

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      Abstract: Abstract Slope failures along highways can highly affect the stability of road structure. In this respect, the analysis of the wetting process in unsaturated media is of great importance to slopes and pavements. In this study, the Barcelona basic model (BBM) was implemented in finite difference-based program to investigate the geomechanical behavior of fine-grained unsaturated soils subjected to wetting. This numerical modeling has been verified against some data in the literature. The application of the model was investigated for the response of a compacted fill slope involving suction-induced problems. The study also considered the effect of the over-consolidation ratio (OCR) in unsaturated soils, especially stress paths, as a modification to BBM. The simulations also include using BBM and modified BBM in FLAC to evaluate the response of deep soil mixing (DSM) improvement method in subsurface areas of the pavements in unsaturated media. Finally, modified BBM codes in the finite-difference program were presented for dealing with problems associated with soil slope and the DSM method to improve the foundation of pavements. Also, over-consolidation ratio has been added to BBM to optimize its application in suction various processes. Overall, it has been found that the modified BBM leads to more occurred results.
      PubDate: 2022-04-01
       
  • Numerical Evaluation of Soil-Pile-Structure Interaction Effects in
           Nonlinear Analysis of Seismic Fragility Curves

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      Abstract: Abstract Seismic fragility curves are considered an effective tool for the evaluation of the behavior of interaction of the soil-pile-structure (ISPS) subjected to earthquake loading. In this research, in order to better understand the ISPS effect, a nonlinear static analysis is applied with a variation of the vertical load, the diameter of pile, and finally the longitudinal steel ratio of the pile in different types of sand (loose, medium, dense) to obtain the capacity curves of each parameter for elaborating the curves of fragility. After a comparison of fragility curves of these parameters, it appears that the effect of the ISPS system is advantageous with respect to the vertical axial load and the diameter of pile, while the longitudinal ratio of the pile depending on the ductility and the lateral resistance of the ISPS system. The proposed equation is intended to help engineers in the design and performance of the soil-pile-structure interaction. The results of this equation provided a convergence with the results of the fragility curves.
      PubDate: 2022-04-01
       
  • Three-Dimensional Circular Trapdoor Stability

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      Abstract: Abstract The stability of a circular opening trapdoor in undrained cohesive soils is numerically investigated using three-dimensional (3D) numerical simulations. FLAC3D, a finite difference program using the shear strength reduction method (SSRM), is employed to determine the factor of safety (FoS) solutions that are a function of the depth ratio and the shear strength ratio. Numerical results from the current FoS study suggest that the 3D circular opening results are almost twice larger than those in 2D study. The strong arching effects have been noted for deeper cases, and the corresponding global failure mechanism is observed. The results are compared with published solutions in the literature. Practical examples are used to demonstrate how to use the design charts and equations in practice.
      PubDate: 2022-04-01
       
  • Influence of Granular Columns on the Behavior of Reinforced-Soil Wall on
           Layered Soft Foundation

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      Abstract: Abstract This paper numerically investigates the effectiveness of granular columns on the performance of a reinforced soil wall (RSW) along the construction period. The column wall methodology was employed to convert the granular columns into the plane strain configuration. Following model validation with field data, the influence of critical factors including soft soil and granular column strength properties as well as basal reinforcement is examined in terms of foundation deformations, wall facing deflection, tension in geogrid reinforcements, and wall short-time stability. The results showed that columns’ diameter and their center-to-center spacing had the significant impact on RSW performance among others, as the magnitude of wall deformations and facing deflection were found to be significantly influenced by the granular columns. The internal friction angle of column materials, however, was shown to have a negligible influence on wall performance. In addition, using a high stiffness reinforcement at the base of the wall remarkably improved its deformations over soft foundation, thus enhancing its stability during working stress conditions.
      PubDate: 2022-03-31
       
  • Evaluation of Expansive Soil Amended with Fly Ash and Liquid Alkaline
           Activator

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      Abstract: Abstract This paper presents the use of fly ash (FA) and liquid alkaline activator (LAA) to amend the engineering behavior of expansive soil (ES) based on a series of unconfined compressive strength (UCS), expansion ratio (ER), California bearing ratio (CBR), and free swell index (FSI) tests conducted on various sets of natural and amended ES with different proportions of FA with LAA at different curing periods of 7, 14, and 28 days. Microstructure analysis was carried out by field emission scanning electron microscopy. This study also evaluates the performance of pavement subgrade with amended ES. The LAA is a mixture of 1.0 molar sodium metasilicate and 10.0 molars of sodium hydroxide solution mixed in the proportion of 70:30, respectively. The results indicate that ER and FSI decrease when FA content increases with optimum alkaline activator content (OLC) in the combination, whereas UCS and CBR values initially increase with an increase in FA content up to 25% and after which they decrease. It is also observed that, with an increase in curing periods, the ER and FSI decrease, whereas UCS and CBR values increase. Also, the flexible pavement’s total thickness and initial cost first decrease up to optimum FA content (25%) with OLC after that increases.
      PubDate: 2022-03-28
       
 
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