The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Jinchun Chai - One of the best experts on this subject based on the ideXlab platform.
-
lateral displacement of soft ground under vacuum pressure and Surcharge Load
Frontiers of Architecture and Civil Engineering in China, 2011Co-Authors: Chinyee Ong, Jinchun ChaiAbstract:Surcharge Load (e.g. embankment fill) will induce settlement and outward lateral displacement, while vacuum pressure will induce settlement and inward lateral displacement of a ground. Ideally, combination of Surcharge Load and vacuum pressure can reduce or minimize the lateral displacement. Laboratory large scale model (length: 1.50 m, width: ∼0.62 m, height: 0.85 m) tests and finite element analyses (FEA) were conducted to investigate the main influencing factors on lateral displacement of a soft clayey ground under the combination of vacuum pressure and Surcharge Load. For the conditions investigated, the results indicate that the outward lateral displacement increases with the increase of the ratio of Surcharge Load to vacuum pressure (RL) and the Loading rate of the Surcharge Load (LR). Also, it is shown that for a given RL and LR condition, lateral displacement reduces with the increase of the initial undrained shear strength (S u) of the ground. To predict the lateral displacement of a ground under the combination of Surcharge Load and vacuum pressure, the Loading conditions in terms of RL and LR, and S u value of the ground have to be considered.
-
comparison of vacuum consolidation with Surcharge Load induced consolidation of a two layer system
Geotechnique, 2009Co-Authors: Jinchun Chai, K Matsunaga, A Sakai, S. HayashiAbstract:Laboratory consolidation tests for a two-layer soil system under oedometer conditions were conducted under both vacuum pressures and Surcharge Loads. The effects of the order of soil layers on the behaviour of vacuum consolidation of the two-layer soil system have been investigated by comparing vacuum pressure and Surcharge Load induced consolidations. Under one-way drainage conditions, for both a Surcharge Load and a vacuum pressure, the order of soil layers only influences the rate of consolidation but not the final settlement. When a layer with a relative lower value of hydraulic conductivity (k) is located immediately adjacent to the drainage boundary, the consolidation rate is slower. However, for vacuum pressure applied under two-way drainage conditions, the order of the soil layers not only influences the rate of consolidation but also the magnitude of settlement.
-
ground deformation induced by combination of vacuum pressure and Surcharge Load
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal), 2009Co-Authors: Jinchun Chai, Chinyee OngAbstract:Laboratory large-scale model (length: 1.50m, width: ~0.62m, height: 0.85m) tests and finite element analyses (FEA) were conducted to investigate the deformation characteristics of soft clayey ground under the combination of vacuum pressure and Surcharge Load. Both the model test and FEA results indicate that the combination of vacuum pressure with Surcharge Load can reduce the lateral displacement of the model ground. The outward lateral displacement increases with the increase of the Loading rate (LR) of Surcharge Load and the ratio of Surcharge Load to vacuum pressure (RL). The results also indicate that by adjusting LR and RL, the lateral displacement of the ground can be minimized.
-
ground deformation induced by vacuum consolidation
Journal of Geotechnical and Geoenvironmental Engineering, 2005Co-Authors: Jinchun Chai, J P Carter, S. HayashiAbstract:The deformation characteristics of soil subjected to vacuum pressure are discussed and an approximate method is proposed for calculating settlement and lateral displacement of the ground induced by vacuum consolidation. Laboratory oedometer test results indicate that if the vacuum pressure alone is larger than the lateral stress required to maintain an at-rest (no horizontal strain) condition, there will be inward lateral displacement and the vacuum pressure will induce generally less settlement than a Surcharge Load of the same magnitude. In the case of field vacuum consolidation, the confining stress acting on a soil element can be regarded as consisting of two parts: Due to vacuum pressure and earth pressure. Assuming a value of the lateral earth pressure coefficient acting in the ground under vacuum consolidation ( kao ) , somewhere between the active and at-rest values, an equation defining the depth—below which there will be no significant inward lateral displacement—is derived. Further, assuming th...
Sunbin Kim - One of the best experts on this subject based on the ideXlab platform.
-
performance of a two tier geosynthetic reinforced segmental retaining wall under a Surcharge Load full scale Load test and 3d finite element analysis
Geotextiles and Geomembranes, 2008Co-Authors: Chungsik Yoo, Sunbin KimAbstract:Abstract This paper presents the results of a full-scale Load test and a 3D finite element analysis on a two-tier, 5 m high, geosynthetic reinforced segmental retaining wall (GR-SRW) subjected to a Surcharge Load aiming at investigating the response of the GR-SRW to various levels of Surcharge Load. The results of the Load test at working stress condition revealed that the GR-SRW's response to the test Load was well within the serviceability limits, and that the currently available design guideline tends to over-estimate the Surcharge Load-induced reinforcement forces. The predicted results for the Surcharge Load well in excess of the test Load indicated that the Surcharge Load-induced reinforcement strains exponentially decrease with depth, showing a good agreement in qualitative terms with that assumed in the FHWA design guideline. The predicted wall deformation at the allowable bearing pressure of 200 kPa was within the serviceability level demonstrating an excellent Load carrying capacity of the GR-SRW. Design implications and the findings from this study are discussed.
-
Load carrying characteristics of a Surcharge Loaded tiered segmental retaining wall
한국지반신소재학회 학술발표회, 2008Co-Authors: Chungsik Yoo, Sunbin Kim, Jaewang KimAbstract:The Load carrying characteristics of a two-tier geosynthetic-reinforced segmental retaining wall (GR-SRW) under a Surcharge Load was investigated in this study. A 3D finite element analysis was conducted on a 5.6-m-high two tier segmental retaining wall subject to a Surcharge Load well in excess of working Load aiming at investigating the Load carrying capacity of the tiered GR-SRW. The results of the analysis were examined in terms of the Surcharge Load induced wall performance. Demonstrated in this study was that a GR-SRW in tiered configuration has an excellent Load carrying capacity. showing no sign of instability up to the maximum applied Surcharge pressure of 1500 kPa. Practical implications of the findings are discussed.
S. Hayashi - One of the best experts on this subject based on the ideXlab platform.
-
comparison of vacuum consolidation with Surcharge Load induced consolidation of a two layer system
Geotechnique, 2009Co-Authors: Jinchun Chai, K Matsunaga, A Sakai, S. HayashiAbstract:Laboratory consolidation tests for a two-layer soil system under oedometer conditions were conducted under both vacuum pressures and Surcharge Loads. The effects of the order of soil layers on the behaviour of vacuum consolidation of the two-layer soil system have been investigated by comparing vacuum pressure and Surcharge Load induced consolidations. Under one-way drainage conditions, for both a Surcharge Load and a vacuum pressure, the order of soil layers only influences the rate of consolidation but not the final settlement. When a layer with a relative lower value of hydraulic conductivity (k) is located immediately adjacent to the drainage boundary, the consolidation rate is slower. However, for vacuum pressure applied under two-way drainage conditions, the order of the soil layers not only influences the rate of consolidation but also the magnitude of settlement.
-
ground deformation induced by vacuum consolidation
Journal of Geotechnical and Geoenvironmental Engineering, 2005Co-Authors: Jinchun Chai, J P Carter, S. HayashiAbstract:The deformation characteristics of soil subjected to vacuum pressure are discussed and an approximate method is proposed for calculating settlement and lateral displacement of the ground induced by vacuum consolidation. Laboratory oedometer test results indicate that if the vacuum pressure alone is larger than the lateral stress required to maintain an at-rest (no horizontal strain) condition, there will be inward lateral displacement and the vacuum pressure will induce generally less settlement than a Surcharge Load of the same magnitude. In the case of field vacuum consolidation, the confining stress acting on a soil element can be regarded as consisting of two parts: Due to vacuum pressure and earth pressure. Assuming a value of the lateral earth pressure coefficient acting in the ground under vacuum consolidation ( kao ) , somewhere between the active and at-rest values, an equation defining the depth—below which there will be no significant inward lateral displacement—is derived. Further, assuming th...
Chungsik Yoo - One of the best experts on this subject based on the ideXlab platform.
-
performance of a two tier geosynthetic reinforced segmental retaining wall under a Surcharge Load full scale Load test and 3d finite element analysis
Geotextiles and Geomembranes, 2008Co-Authors: Chungsik Yoo, Sunbin KimAbstract:Abstract This paper presents the results of a full-scale Load test and a 3D finite element analysis on a two-tier, 5 m high, geosynthetic reinforced segmental retaining wall (GR-SRW) subjected to a Surcharge Load aiming at investigating the response of the GR-SRW to various levels of Surcharge Load. The results of the Load test at working stress condition revealed that the GR-SRW's response to the test Load was well within the serviceability limits, and that the currently available design guideline tends to over-estimate the Surcharge Load-induced reinforcement forces. The predicted results for the Surcharge Load well in excess of the test Load indicated that the Surcharge Load-induced reinforcement strains exponentially decrease with depth, showing a good agreement in qualitative terms with that assumed in the FHWA design guideline. The predicted wall deformation at the allowable bearing pressure of 200 kPa was within the serviceability level demonstrating an excellent Load carrying capacity of the GR-SRW. Design implications and the findings from this study are discussed.
-
Load carrying characteristics of a Surcharge Loaded tiered segmental retaining wall
한국지반신소재학회 학술발표회, 2008Co-Authors: Chungsik Yoo, Sunbin Kim, Jaewang KimAbstract:The Load carrying characteristics of a two-tier geosynthetic-reinforced segmental retaining wall (GR-SRW) under a Surcharge Load was investigated in this study. A 3D finite element analysis was conducted on a 5.6-m-high two tier segmental retaining wall subject to a Surcharge Load well in excess of working Load aiming at investigating the Load carrying capacity of the tiered GR-SRW. The results of the analysis were examined in terms of the Surcharge Load induced wall performance. Demonstrated in this study was that a GR-SRW in tiered configuration has an excellent Load carrying capacity. showing no sign of instability up to the maximum applied Surcharge pressure of 1500 kPa. Practical implications of the findings are discussed.
S R Gandhi - One of the best experts on this subject based on the ideXlab platform.
-
effect of slope on p y curves due to Surcharge Load
Soils and Foundations, 2008Co-Authors: K Muthukkumaran, R Sundaravadivelu, S R GandhiAbstract:An extensive program of laboratory model tests was undertaken to study the effect of slope on p-y curves due to Surcharge Load in dry sand. The paper concerns the method developed in a series of laboratory model tests to experimentally determine p-y curves. Bending moment curves are differentiated by using curve fitting method of cubic polynomial function. The study includes effect of slope angle and relative density on bending moment, lateral soil resistance, lateral deflection and non-dimensional p-y curves. The non-dimensional p-y curves for piles on sloping ground under Surcharge Load are developed modifying API RP 2A (2000) method by including a Reduction Factor (R) using the experimental results.