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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

在粘性土模型路堤上进行了离心机加载试验，以检查填充物中滑动表面的发展和相关的孔隙水压力。对于2.9m高原型路堤的边坡破坏，试验中多观察到穿过坡脚的圆形滑动面，这可以很好地解释利用模型获得的土样总应力强度参数进行的稳定性分析。然而，模型中孔隙水压力的测量精度相对较差，无法与填充物的实际滑动和变形行为一起讨论破坏机制。还对具有中心位置核心的堆石坝模型进行了离心加载试验，以研究核心由于自重而产生的变形模式。对于两种不同类型的测试核心，在核心沟槽附近发现了严重的应变集中，并且通过简单的重力开启有限元弹性应力分析，令人满意地定性地跟踪了这些模型的变形模式。通过使用非线性有限元应力分析方法并考虑逐步放置条件，检查了变形大小与抗滑安全系数之间的关系。结论认为，施工过程中安全系数的取值与横向变形的取值应存在一定的相关性，虽然安全系数与横向变形之间的关系在定性上是肯定的，但有限元法得到的安全系数的取值与普通稳定性分析方法的取值并不十分吻合。对降雨流过路堤的渗流进行了二维非稳态饱和-非饱和有限元渗流分析，研究了时间间隔、有限元网格尺寸和收敛允许误差对解的影响。总结出获得一定可靠解的时间间隔与允许误差之间存在着独特的关系，对于这些渗流问题的解，应明确说明上述参数的解析条件，以体现其准确性。较少的