Model test on effect of rainfall on seepage and deformation of carbonaceous mudstone-soil stratified embankment

被引：4

作者：

Fu H. ^{[1
]}

Chen J. ^{[1
]}

Zeng L. ^{[1
]}

Qiu X. ^{[1
]}

机构：

[1] School of Civil Engineering, Changsha University of Science & Technology, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2018年 / 49卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Carbonaceous mudstone; Deformation characteristics; Model experiment; Rainfall infiltration; Seepage characteristics; Stratified embankment;

D O I：

10.11817/j.issn.1672-7207.2018.11.027

中图分类号：

学科分类号：

摘要：

In order to study the effect of rainfall infiltration on seepage characteristics and stability of carbonaceous mudstone-soil stratified embankment, physical model test of carbonaceous mudstone-soil stratified embankment under rainfall condition was carried out based on indoor model test method. In this test, water quality tester, tension meter, earth pressure box and dial gauge were used. The results show that under condition of rainfall, the variation laws of soil water content inside the slope (matrix suction) can be summarized into four stages, i.e. basic stability, rapid increase (decrease), slow increase (decrease) and continuous decrease (increase). The low-permeability soil in stratified embankment can reduce the migration rate of rainwater in high permeability soil. During the rainfall process, the increase of soil water content in the slope is inversely proportional to the elevation and the decrease of soil water content is proportional to the elevation. The response time and amplitude of soil water content are inversely proportional to the distance from slope surface. The change law of matrix suction with time is basically opposite to that of water content. When rainfall begins, the soil thrust under slope foot first increase in the direction of pointing horizontally to slope surface along the inside of slope, and then decreases. The horizontal displacement of slope top increase in the direction of pointing horizontally to slope surface and vertical displacement of slope top continuously increase along the vertical downward direction. The change of thrust under slope foot and displacement of slope top have a great correlation with the slope stability. © 2018, Central South University Press. All right reserved.

引用

页码：2852 / 2860

页数：8

共 21 条

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