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EXPLICATION OF PROGRESS FAILURE IN SLOPE STABILITY AND ITS ANALYSIS WITH STRAIN-SOFTENING CONSTITUTIVE EQUATION

边坡稳定性进展破坏的解释及应变软化本构方程分析

基本信息

批准号：
06452268
负责人：
ADACHI Toshihisa
金额：
$ 0.77万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The slope failure, composed by the soft rock or over-consolidated clay, can be considered to be induced as the results of the progressive failure in which the local failure is generated by non-homogeneous distribution of stress at a local point inside the slope at the start, and it progressively propagates to other parts in the slope. We tried to obtain an analytical model with which the slope failure can be simulated as a progressive failure phenomenon.At the first step of the research, we investigated the time-dependent behavior of soft rock and over-consolidated clay and the effects of physicochemical fissure behavior to the strain-hardening-softening behavior through some experiments such as the triaxial tests. The hardening-softening type of the constitutive equation, which had been proposed by the head investigator, et al., was extended, on the base of the experimental results, to be able to express both the time-dependent behavior and the physicochemical fissure behavior.At the second step, the boundary value problem was discussed by applying the extended constitutive equation to the slope failure phenomenon and creating the analytical model for it. Some model cases of the slope failure were simulated by a few methods and the optimum simulating method was obtained to express the progressive failure phenomenon.At the third step, the model experiments were carried out by using centrifuge. In the experiments, though the progressive failure phenomenon of both the excavated and natural slope was tried to reproduce the progress failure in a centrifuge force field, the conclusive results have not been obtained yet until the current stage.The continuous research will be carried out to apply the results of the research not only to the rational design, construction and maintenance of slopes but also to the prediction of the slope failure.

由软岩或超固结粘土组成的边坡破坏可以认为是渐进破坏的结果，即边坡内部局部点的应力分布不均匀，在开始阶段产生局部破坏，并逐渐向边坡其他部位传播。本文首先通过三轴试验等试验研究了软岩和超固结粘土的时变特性以及物理化学裂隙特性对应变硬化-软化特性的影响，并建立了一个能将边坡破坏模拟为渐进破坏现象的分析模型。由首席研究员等人提出的硬化-软化型本构方程，在实验结果的基础上，对裂纹扩展模型进行了扩展，使其既能表达裂纹的时变行为，又能表达裂纹的物理化学行为。将扩展的本构方程应用于边坡破坏现象，建立了边坡破坏的分析模型，讨论了边坡破坏的边值问题，用几种方法模拟了几种边坡破坏的模型情况，得到了最佳模拟方法第三步，利用离心机进行模型试验。在试验中，虽然尝试了开挖边坡和天然边坡的渐进破坏现象，以再现离心力场中的渐进破坏现象，但到目前为止，还没有得出结论性的结果，将继续进行研究，将研究成果应用于边坡的合理设计、施工和维护，并预测边坡的破坏。