Microscopic study on crushability and compressibility of residual soils

残余土的破碎性和压缩性的微观研究

基本信息

批准号：
09650541
负责人：
KUSAKABE Osamu
金额：
$ 2.24万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

We consider that phenomena of particle crushing should be regarded as progressive and time dependent behaviour. The outcomes of the research maybe summarized in the following four points.(1) Evidences of time dependent behavior related to particle crushing have been gathered from a comprehensive literature survey and categorically summarized. It has become clear that time dependent behavior can be observed with particle crushing, without dissipation of pore water pressure(2) Crushing characteristics of single particle were studied by conducting a series of crushing tests on quarts particles obtained from weathered granite at Hiroshima prefecture. It was found from the tests that crushing strength depends on particle size and the probability of occurrence of the number of fracture exponentially decreases.(3) One dimensional compression tests were carried out on the specimens formed by a stack of crushable cylindrical materials, from which observed failure mechanisms were classified. It was found that the accumulated number of crushed cylinders reached at 30% when the compression curve exhibits yielding and the two distinct mechanisms were split failure and compression failure a the contact points.(4) Long-term Two dimensional bearing tests of rigid footing were conducted for the model ground consisting of crushable cylinders. It was confirmed that the time-dependent behavior was observed and the formation of slip line was strongly associated with the rotation of the cylinders.

我们认为，颗粒粉碎现象应被视为进行性和时间依赖的行为。研究的结果可能总结在以下四个点中。（1）与粒子粉碎相关的时间依赖行为的证据是从全面的文献调查中收集的，并被绝对地总结了。很明显，可以通过颗粒碎裂观察到时间依赖的行为，而不会通过对从Hiroshima山区风化的花岗岩获得的夸脱颗粒进行一系列粉碎测试来研究单个颗粒的碎屑特征。从测试中发现，压碎强度取决于粒度和发生骨折数量的发生概率，指数下降。（3）对一堆可碎圆柱材料形成的样品进行了一维压缩测试，从该样品形成的样品中，从该样品中分类了观察到的失败机制。发现当压缩曲线表现出屈服时，累积的碎缸数量达到30％，并且两种不同的机制是分裂失败和压缩故障A的接触点。（4）对由可压碎机组成的模型接地进行了长期的刚性底脚的长期二维轴承测试。已经确认观察到时间依赖性行为，并且滑动线的形成与圆柱体的旋转密切相关。