大位移滑坡形态的物质点法模拟

孙玉进; 宋二祥

doi:10.11779/CJGE201507007

大位移滑坡形态的物质点法模拟 English Version

清华大学土木工程安全与耐久教育部重点实验室,北京 100084

基金项目: 国家重点基础研究发展计划（“973”计划）项目; （2014CB047004）

详细信息

作者简介:
孙玉进（1988- ）,男,博士研究生,主要从事岩土数值计算分析。E-mail: sunyj12@mails.tsinghua.edu.cn。

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出版历程
- 收稿日期: 2014-05-25
- 发布日期: 2015-07-19

Simulation of large-displacement landslide by material point method

Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education, Tsinghua University, Beijing 100084, China

摘要

摘要: 滑坡是一典型的动力大变形过程,对这种变形很大的问题如欲模拟其变形后的形态,应用传统有限元法会遇到较大困难。应用物质点法这一较新的数值方法对一高边坡发生滑坡的全过程进行了动态模拟分析,同时结合这一分析对大位移滑坡过程进行了讨论。首先将黏性阻尼与运动阻尼相结合,应用动态松弛技术生成边坡初始应力场,初始应力场与有限元计算结果相符。接着将土体黏聚力降为0,诱导稳定边坡滑坡。滑坡模拟过程表明,滑动面的位置和曲率在滑动过程中均不断变化,滑动模式由转动滑动向平动滑动转变,最终形成的稳定边坡坡角小于土体内摩擦角。
- 滑坡 /
- 物质点法 /
- 大变形 /
- 数值模拟 /
- 动态松弛
Abstract: The classical finite element method (FEM) is not suitable for the simulation of large-displacement landslide, which is a typical dynamic process involving extremely large deformation. A dynamic simulation of a landslide by the material point method is presented, and some numerical techniques in relation with this method are discussed. First, the dynamic relaxation techniques, viscous damping and kinetic damping, are employed to generate the initial stress field within the entire slope, and the results are in accordance with those calculated by the finite element method. Then, the slide is triggered for the initially stable slope by removing the cohesion of the soil, and the entire sliding process is followed until a new state of static equilibrium is reached. The simulation shows that the position and curvature of the failure surface during sliding change with time, that the sliding mode varies from rotational mode at the beginning of sliding to plane mode later, and that eventually a stable slope is formed, the repose angle of which is less than the internal friction angle of the soil .
- landslide /
- material point method /
- large deformation /
- numerical simulation /
- dynamic relaxation

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参考文献(14)

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