地震边坡失稳机理及稳定性分析

言志信; 张森; 张学东; 段建

地震边坡失稳机理及稳定性分析

1.
兰州大学土木工程与力学学院兰州 730000;
2.
西部灾害与环境力学教育部重点实验室兰州 730000

基金项目:

高等学校博士学科点专项科研基金项目（20090211110016;甘肃省科技计划资助项目（096RJZA048）

详细信息

作者简介:
言志信,主要从事岩土、爆破、地质工程研究工作.Email:yzx10@163.com

中图分类号: TU457
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- 被引次数: 0
出版历程
- 收稿日期: 2010-04-20
- 修回日期: 2010-10-31
- 刊出日期: 2010-12-25

FAILURE MECHANISM AND STABILITY ANALYSIS OF SLOPE UNDER EARTHQUAKE

1.
School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000;
2.
Key Laboratory of Mechanics on Disaster and Environment in Western China,Ministry of Education,Lanzhou 730000

摘要

摘要: 通过对汶川地震边坡调研,发现大量边坡破坏形式为坡顶拉裂、下部坡体剪切破坏。本文利用有限差分程序,从边坡土体的应力状态出发,通过监测边坡土体的状态、位移和剪应变增量变化等,分析了岩土体在静力、横向地震和耦合地震作用下的破坏过程,发现坡顶附近发生张破坏,以下部位发生剪切破坏,而非传统的地质工程观点地震边坡破坏主要是地震惯性力造成的剪切破坏。并提出一种新方法关键点相对位移法,来判断边坡的动力稳定性,数值模拟结果与已有研究成果及震后灾害调查结果具有良好的一致性。
- 边坡工程 /
- 地震 /
- 破坏机制 /
- 关键点相对位移法 /
- 动力稳定性
Abstract: Investigation of the slopes in Wenchuan earthquake shows that tension failures mostly appear in the slope crests,and shear failure in slope toe. Beginning with the stress state of soil,using the finitedifference method,the failure process of slope is analyzed under the given conditions of static,horizontal and coupled earthquake by monitoring the changing of state,displacement,and shearstrain increment. The calculated results indicate that the slope crest is tensile damage and shear failure appears in slope toe. It is different from the traditional opinion of geological engineering that slope damage under earthquakes is mainly shear failure due to seismic inertia force. A new method of the relative displacement of key points is put out to judge the dynamic stability. Numerical simulation results have good consistency with existing research results and postseismic investigation findings．
- Slope engineering /
- Earthquake /
- Failure mechanism /
- The relative displacement of key points /
- Dynamic stability

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参考文献(1)

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