Simulation of the progressive failure of an embankment on soft soil
Simulation of the progressive failure of an embankment on soft soil
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DOI：
10.1016/j.compgeo.2009.03.010
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发表时间：
2009-07-01
影响因子：
5.3
通讯作者：
Carter, John P.
中科院分区：
文献类型：
--
作者：
Chai, Jinchun;Carter, John P.
一个实用的应变软化本构模型，这是基于修改凸轮粘土，被施加到模拟的渐进破坏的存款上的敏感（应变软化）粘土在日本佐贺，筑堤。这种情况下的预测比较表明，如果软化被忽略，只有相对较小的挠度和固结沉降预测，特别是施工后。与此相反，对于软化包括在分析中的情况下，在粘土内的渐进破坏引起大的剪切变形，并最终失败的路堤进行预测。这一比较表明，软化引起的渐进破坏，应考虑在设计中的装饰在这样的土壤，和剩余强度的存款可能有重要影响的整体安全系数的建设。对预测的超孔隙水压力、剪切应变和剪切应力水平的详细分析表明，考虑应变软化过程：（a）与超孔隙水压力的累积有关;（B）促进应变局部化;（c）通常导致破坏所涉及的土壤区域更大。(C)2009爱思唯尔有限公司保留所有权利。
A pragmatic strain-softening constitutive model, which is based on Modified Cam Clay, was applied to the simulation of the progressive failure of an embankment constructed on a deposit of sensitive (strain-softening) clay in Saga, Japan. A comparison of the predictions for this case indicates that if softening is ignored, only relatively small deflections and consolidation settlements are predicted, especially after construction. In contrast, for the case where softening is included in the analysis, progressive failure within the clay induces large shear deformations and finally failure of the embankment is predicted. This comparison suggests that softening-induced progressive failure should be considered in the design of embankments on such soils, and the residual strength of the deposit may have an important influence on the overall factor of safety of the construction. Detailed analyses of predicted excess pore water pressures, shear strains and shear stress levels in the ground indicate that considering the strain-softening process: (a) is associated with the buildup of excess pore water pressure; (b) promotes strain localization: and (c) results generally in a larger zone of soil involved in the failure. (C) 2009 Elsevier Ltd. All rights reserved.