Establishment of strain softening elasto-visco-plastic constitutive model and studies on the progressive failure of ground material

应变软化弹粘塑性本构模型的建立及地基材料渐进破坏研究

基本信息

批准号：
12450191
负责人：
ADACHI Toshihisa
金额：
$ 5.12万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

By the centrifuge modeling tests and the finite element analyses, the purposes of this research work are to establish the constitutive model which can expresses both strain-softening and time dependency behavior of soft rock and over-consolidated clay, to discuss the stability of the slope which consists of soft rock and/or over-consolidated clay, and then to grasp the mechanism of the progressive failure. Moreover, it is considered that the time dependency behavior of soft rock is equivalent to the change of the effective stress with the change of pore pressure, the constitutive model is applied to the boundary value problem as the water-coupling problem. Then, the constitutive model with soil-water coupling is also applied to the collapse of the slope.The remarkable mechanical behavior of soft rock and over-consolidated clay can be presented by the strain hardening and softening in the stress - strain relation and the positive dilation with progressed the strain softening. In this re … More search work, the elasto-plastic constitutive model with strain softening whose yielding function is defined by the stress-history tensor are established.In the centrifuge modeling tests, the modeling ground makes of mixed Gypsum to Fukakusa clay. Displacement vectors and strain vectors are observed and estimated through the movement of the targets installed in the modeling ground, and then the mechanism of the progressive failure of the slope is discussed.Various parameters of the proposed constitutive model are determined through the element experiments, and then the finite element soil-water coupling analyses are carried out to simulate the progressive failure of the slope. As compared the numerical simulations with the experimental results, the progressive failure of the slope is discussed.Finally, actual progressive failure of cutting slope in the sedimentary mudstone is simulated by the soil-water coupled analysis based on the elasto-plastic constitutive model with strain softening. Compared the actual collapse with the numerical results, the validity and the problem of the proposed model are discussed. Less

通过离心机建模测试和有限元分析，这项研究工作的目的是建立构成模型，该模型可以表达软岩和过度固定的粘土的应变且依赖性的行为，以讨论由软岩石和/或过度固化的粘土和过度固化的粘土以及逐渐恢复机构的坡度稳定性的稳定性。此外，认为软岩的时间依赖行为等于随着孔隙压力的变化，有效应力的变化，本构模型被应用于边界值问题作为水耦合问题。然后，还将具有土壤耦合的本构模型应用于坡度的塌陷。软岩石和过度固结的粘土的显着机械行为可以通过应变硬化和软化 - 应变关系 - 阳性词典和正词术带来的较软性。在此搜索工作中，更多的搜索工作，具有应变软化的弹性塑构模型，其屈服功能是由应力 - 历史张量定义的。在离心机建模测试中，将混合石膏与福克库萨·克莱（Fukakusa Clay）相结合。通过在建模地面上安装的目标的运动观察和估计位移矢量和应变矢量，然后讨论坡度的逐渐失效的机制。拟议本构模型的各种参数是通过元素实验确定的，然后通过元素实验来确定，然后确定最终的元素土壤 - 水含量分析以模拟SLPEREVEREVE sLPERE sLEPERIDE sLEPERIDE SLEPIRES sLEPERIDE。随着比较数值模拟与实验结果，讨论了坡度的逐渐失败。在最终，通过弹性软化模型的弹性塑料组成模型的土壤 - 水耦合分析模拟了沉积泥岩中切割斜率的实际进行性逐渐失败。较少的