暗穴环境下非饱和黄土边坡稳定性分析

李喜安; 黄润秋; 李荣建; 李亮

doi:10.13544/j.cnki.jeg.2014.03.003

暗穴环境下非饱和黄土边坡稳定性分析

doi: 10.13544/j.cnki.jeg.2014.03.003

1.
长安大学地质工程与测绘学院西安 710054;
2.
地质灾害防治与地质环境保护国家重点实验室成都 610059;
3.
西安理工大学岩土工程研究所西安 710048

基金项目:

国家自然科学基金项目（41172255，11072193），中国博士后科学基金资助项目（20100481354）和地质灾害防治与地质环境保护国家重点实验室开放资金（SKLGP2012K028）资助

详细信息

作者简介:
李喜安，男，博士，教授，主要从事黄土地质灾害方面的教学与科研工作.Email：dclixa@chd.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2013-06-07
- 修回日期: 2014-03-14
- 刊出日期: 2014-06-25

FEM STABILITY ANALYSIS OF LOESS SLOPE WITH TUNNELING EROSION

1.
College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054;
2.
State Key Laboratory of Geo-hazards Prevention and Geo-environment Protection, Chengdu 610059;
3.
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048

摘要

摘要: 黄土暗穴在水土流失方面作为一种独特的侵蚀方式，往往会威胁到建设在非饱和黄土层之上的公路边坡稳定性。基于考虑基质吸力的强度折减有限元程序，本文通过开展不同位置暗穴、单双暗穴和基质吸力赋存与丧失等条件下边坡稳定性的对比研究，着重对影响边坡稳定性的暗穴、基质吸力等因素进行了研究。研究结果表明，当暗穴接近地表时由于存在一定的减载效应而利于坡体的稳定，而当暗穴接近边坡坡脚时则成为黄土边坡稳定性的不利因素，在边坡底部存在的双暗穴明显削弱了边坡的稳定性，基质吸力使得非饱和黄土边坡安全系数增大，潜在滑动面变深，反之则使安全系数减小，潜在滑动面上移，基质吸力的丧失或减小以及暗穴的削弱作用使得潜在滑动面位置变化较大。
- 黄土 /
- 边坡 /
- 稳定性 /
- 基质吸力 /
- 暗穴
Abstract: The tunneling erosion is not only a unique mode of soil erosion,but also usually an important factor to the stability of the highway slopes of unsaturated loess in the loess plateau. Based on the developed program of the strength reduction FEM with matric suction,this paper comparatively studies the different cases of the unsaturated loess slope stabilities. The results reveal the possible different effects on the stability of unsaturated loess slope by erosion tunneling as well as matric suction. The results indicate that when their occurrence nears the slope crest,the tunnel erosions prefer to maintain the stability of the slope. On the contrary,when their occurrence nears the slope toe,the tunnel erosions prefer to reduce the stability of slope especially as the tunneling is serious. The results also indicate that the safety factor of the unsaturated loess slope increases and the potential sliding surface moves downward when the matric suction is considered,while the safety factor of the unsaturated loess slope decreases and the potential sliding surface moves upward when the matric suction is ignored.
- Loess slope /
- Stability /
- Matric suction /
- Tunneling erosion /

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参考文献(1)

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