The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Chonglei Zhang - One of the best experts on this subject based on the ideXlab platform.
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field study on swelling shrinkage response of an expansive soil foundation under high speed railway embankment loads
Soils and Foundations, 2018Co-Authors: Guanlu Jiang, Weizhi Chen, Shengyang Yuan, Lijun Wu, Chonglei ZhangAbstract:Abstract This paper presents a comprehensive field investigation of the swelling-shrinkage behavior of an expansive soil ground under high-speed railway embankment loads. In this study, a test site close to the Kunming-Nanning high-speed railway (KNHR) was chosen for the construction of four full-scale field test facilities for artificially soaking the expansive soil ground. Three of the facilities consist of Embankments of three different heights, while the fourth facility is for a series of plate load swelling tests. All the test Embankments were fully instrumented to monitor the ground deformation and the changes in volumetric water content profiles of the foundations. The full-scale field tests were complemented by a detailed site investigation comprised of cone penetration tests (CPTs), standard penetration tests (SPTs) and a comprehensive laboratory characterization of intact expansive soil samples retrieved from the test site. The results obtained from the laboratory and field tests show that the swelling behavior of the expansive soil ground mainly depends on the embankment load. By properly designing the embankment height and considering the maximum swelling pressure the expansive ground could induce, the heave of the embankment could be controlled efficiently. The measured displacements at the ground surface are well correlated with the evolution of measured volumetric water contents within a ground depth of around 4.5 m. The majority of these displacements occurred when the ground was approaching saturation along both wetting and drying paths. Finally, a simple method based on one-dimensional test results was proposed, and a good performance was shown in predicting the heave or settlement of Embankments over an expansive soil ground upon wetting and drying.
Shengyang Yuan - One of the best experts on this subject based on the ideXlab platform.
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field study on swelling shrinkage response of an expansive soil foundation under high speed railway embankment loads
Soils and Foundations, 2018Co-Authors: Guanlu Jiang, Weizhi Chen, Shengyang Yuan, Lijun Wu, Chonglei ZhangAbstract:Abstract This paper presents a comprehensive field investigation of the swelling-shrinkage behavior of an expansive soil ground under high-speed railway embankment loads. In this study, a test site close to the Kunming-Nanning high-speed railway (KNHR) was chosen for the construction of four full-scale field test facilities for artificially soaking the expansive soil ground. Three of the facilities consist of Embankments of three different heights, while the fourth facility is for a series of plate load swelling tests. All the test Embankments were fully instrumented to monitor the ground deformation and the changes in volumetric water content profiles of the foundations. The full-scale field tests were complemented by a detailed site investigation comprised of cone penetration tests (CPTs), standard penetration tests (SPTs) and a comprehensive laboratory characterization of intact expansive soil samples retrieved from the test site. The results obtained from the laboratory and field tests show that the swelling behavior of the expansive soil ground mainly depends on the embankment load. By properly designing the embankment height and considering the maximum swelling pressure the expansive ground could induce, the heave of the embankment could be controlled efficiently. The measured displacements at the ground surface are well correlated with the evolution of measured volumetric water contents within a ground depth of around 4.5 m. The majority of these displacements occurred when the ground was approaching saturation along both wetting and drying paths. Finally, a simple method based on one-dimensional test results was proposed, and a good performance was shown in predicting the heave or settlement of Embankments over an expansive soil ground upon wetting and drying.
Chen Renpeng - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation of soil arching within basal reinforced and unreinforced piled Embankments
Geotextiles and Geomembranes, 2008Co-Authors: Chen Yunmin, Cao Weiping, Chen RenpengAbstract:Abstract Geotechnical engineers face several challenges when constructing Embankments over soft soils. These include potential bearing failure, intolerable settlement, and global or local instability. Piled Embankments provide an economic and effective method to construct roads on soft soils. Soil arching developed within such Embankments has significant influence on its behavior. A total of 15 model tests were conducted to evaluate the effects of pile–subsoil relative displacement, embankment height, cap beam width and clear spacing, and geosynthetics with different tensile strengths on stress concentration ratios and settlements in the Embankments. The test results indicate that stress concentration ratio varies with pile–subsoil relative displacement and has upper and lower bounds. A higher ratio of embankment height to cap beam clear spacing, as well as a higher ratio of cap beam width to clear spacing, would result in a higher stress concentration ratio. The inclusion of a geosynthetic membrane can increase the stress concentration ratio. When the embankment height to the cap beam clear spacing ratio, h/s, is less than 1.4, apparent differential settlements may occur on the surface of embankment. When h/s is greater than 1.6, however, no apparent differential settlements will occur on the embankment surface. In addition, experimental results were also compared to several current design methods.
Guanlu Jiang - One of the best experts on this subject based on the ideXlab platform.
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field study on swelling shrinkage response of an expansive soil foundation under high speed railway embankment loads
Soils and Foundations, 2018Co-Authors: Guanlu Jiang, Weizhi Chen, Shengyang Yuan, Lijun Wu, Chonglei ZhangAbstract:Abstract This paper presents a comprehensive field investigation of the swelling-shrinkage behavior of an expansive soil ground under high-speed railway embankment loads. In this study, a test site close to the Kunming-Nanning high-speed railway (KNHR) was chosen for the construction of four full-scale field test facilities for artificially soaking the expansive soil ground. Three of the facilities consist of Embankments of three different heights, while the fourth facility is for a series of plate load swelling tests. All the test Embankments were fully instrumented to monitor the ground deformation and the changes in volumetric water content profiles of the foundations. The full-scale field tests were complemented by a detailed site investigation comprised of cone penetration tests (CPTs), standard penetration tests (SPTs) and a comprehensive laboratory characterization of intact expansive soil samples retrieved from the test site. The results obtained from the laboratory and field tests show that the swelling behavior of the expansive soil ground mainly depends on the embankment load. By properly designing the embankment height and considering the maximum swelling pressure the expansive ground could induce, the heave of the embankment could be controlled efficiently. The measured displacements at the ground surface are well correlated with the evolution of measured volumetric water contents within a ground depth of around 4.5 m. The majority of these displacements occurred when the ground was approaching saturation along both wetting and drying paths. Finally, a simple method based on one-dimensional test results was proposed, and a good performance was shown in predicting the heave or settlement of Embankments over an expansive soil ground upon wetting and drying.
Gerald A. Miller - One of the best experts on this subject based on the ideXlab platform.
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Influence of Compaction Moisture Content on Wetting-Induced Settlement of Embankments
International Journal of Geosynthetics and Ground Engineering, 2017Co-Authors: Yewei Zheng, Kianoosh Hatami, Gerald A. MillerAbstract:This paper presents a numerical investigation on the wetting-induced settlement of Embankments using a finite difference program. The unsaturated compacted fill was simulated using the Barcelona Basic Model. A field unsaturated embankment subjected to full saturation was simulated as the worst case scenario for embankment design. Simulation results indicate that the embankment fill undergoes settlement as a result of wetting, which could lead to differential settlement between the embankment approach and bridge abutment, and cause damage to the approach slab. The influence of compaction moisture content on the wetting-induced settlement of Embankments was also investigated. Results indicate that even though Embankments with higher compaction moisture content could result in initial larger settlement under self-weight compression, the potential for subsequent wetting-induced settlement could be significantly reduced.
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Numerical Modeling of Wetting-Induced Settlement of Embankments
Geo-Congress 2013, 2013Co-Authors: Yewei Zheng, Kianoosh Hatami, Gerald A. MillerAbstract:Compacted fills of Embankments are typically in an unsaturated state. Water infiltration can weaken the Embankments, resulting in excessive deformations and/or embankment slope failure. In this study, the Barcelona Basic Model (BBM) was implemented in the computer program FLAC (2D) to simulate the behavior of unsaturated soils. The BBM implementation in FLAC was verified using analytical results available in the literature. The verified BBM model in FLAC was then used to simulate the wetting-induced response of an example unsaturated embankment due to complete saturation as a worst-case scenario for the embankment design. It is shown that the magnitudes of wetting-induced deformations in the embankment could result in measurable amount of differential settlement in the embankment and even embankment slope failure.
