软弱基座型滑坡震裂机理研究

李果; 黄润秋; 巨能攀; 赵建军

软弱基座型滑坡震裂机理研究

成都理工大学地质灾害防治与地质环境保护国家重点实验室成都 610059

详细信息

作者简介:
李果,主要从事工程地质及地质灾害方面的.Email:ziltch2002@163.com

中图分类号: P642
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出版历程
- 收稿日期: 2011-06-20
- 修回日期: 2011-08-18
- 刊出日期: 2011-10-25

EARTHQUAKE CRACKING MECHANISM OF LANDSLIDE WITH SOFT FOUNDATION

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059

摘要

摘要: 罐滩滑坡是 512 地震诱发的典型反倾软弱基座滑坡,滑坡在地震过程中并未立即滑移,而是在震后余震和降雨共同作用下产生的。为研究滑坡中下部软基在地震过程中对滑坡稳定性的影响,本文以罐滩滑坡的地质结构为背景,建立了有无软弱基座2种结构斜坡的概化模型,通过数值计算揭示了斜坡在地震动力响应过程中的应力演化过程及其破裂的产生和延展趋势。计算结果表明:在斜坡发生破坏之前,软弱基座的存在一定程度上起隔震作用,对斜坡的稳定有利; 一旦斜坡整体性遭到破坏,软弱基座的存在会加剧破裂面的延伸和贯通,最终导致形成滑坡。
- 汶川地震 /
- 强震诱发滑坡 /
- 震裂机理 /
- 动力响应
Abstract: Guantan landslide is a typical anti-dipped rock slope with soft foundation,a result of combined action of Wenchuan earthquake and rainfall after the earthquake.This paper built numerical analysis models of a slope with or without soft foundation.It revealed influence induced by soft foundation to evolution of stress field and extending trend of rupturing process of the slope during earthquake dynamic response process.Calculated result shows that before the failure of the slope,the existence of soft foundation can reduce the role of earthquake dynamic effect to a certain extent,which is positive to slope stability.But once the slope failed,the existence of soft foundation may intensify extension and coalescence of rupture surface,and finally form landslide.
- Wenchuan earthquake /
- Landslides /
- Dynamic response /
- Numerical analysis

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参考文献(1)

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