Experimental Study on Stability Evaluation of Earth Slopes

土坡稳定性评价试验研究

基本信息

批准号：
08555125
负责人：
OHNE Yoshio
金额：
$ 0.96万
依托单位：
Aichi Institute of Technology (A.I.T)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555125/
关键词：
Embankment Slope Centrifuge Test Cohesive Soil Pore Water Pressure FEM Analysis Safety Factor Saturated-Unsaturated Seepage Flow コア形状遠心模型実験斜面変形非線形動的応答解析震度法浸透非定常

项目摘要

Centrifuge loading tests were carried out on model embankments of cohesive soils in order to examine development of sliding surfaces and associated pore water pressures in the fill. Concerning slope failures of 2.9m high prototype embankment, circular sliding surfaces passing through the toe of the slope were mostly observed in the test, which can well be explained in the stability analysis made by use of total stress strength parameters obtained on soil samples from the model. Measurement of pore water pressures in the model, however, was relatively poor in accuracy to discuss failure mechanism together with actual sliding and deformation behavior of the fill. Centrifuge loading tests were also conducted on model rockfill dams with a centrally located core to investigate deformation pattern of the core due to self-weight. Severe strain concentration was remarkably seen in the vicinity of core trench for two different types of the core tested, and deformation patterns of theses models … More were satisfactorily followed qualitatively by a simple gravity turn-on FE elastic stress analysis.The relationship between the magnitude of deformation and the safety factor against sliding was examined by use of a non-linear FE stress analysis method and by taking step-by-step placement condition into account. It is concluded that there should be a certain correlation between the value of safety factor and that of lateral deformation during construction, and that the value of safety factor obtained by FEM does not coincide closely with that of an ordinary method of stability analysis, though the relationship between the safety factor and the lateral deformation is qualitatively affirmative. Two dimensional unsteady saturated-unsaturated FE seepage analysis was also made on seepage flow through embankments by rainfall to study the influence of the time interval, size of FE mesh and the allowable error for convergence to the solutions. It is summarized that there is a unique relationship between the time interval and the allowable error to obtain a certain reliable solution and that analytical conditions on those parameters mentioned above should be sated plainly for the solutions of these seepage problems to present their credit in accuracy. Less

在凝聚力的土壤上进行了离心负载测试，以检查滑动表面的发展和相关的填充水压。在模型中使用的土壤样品中获得的压力强度进行的稳定性分析，模型中的孔隙水均具有相对差的孔隙率。 Ntrally位置的核心，以研究自重的模式。使用非线的FE符合分析方法，并考虑到安全性的价值与结构期间的横向变形之间的关系。尽管他是一种普通的方法，但在安全性和倾斜度上也是肯定的总结说，是A a a a a -nique swortable a a a a -unique rowsion的分析条件和允许的误差之间的一定的解决方案