西南交通大学学报 2009, 44(4) 580-584 DOI:     ISSN: 0258-2724 CN: 51-1277/U

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本文关键词相关文章
颗粒流
数值模拟
地震荷载
松散堆积体
离心模型试验
本文作者相关文章
杨庆华
姚令侃
杨明
PubMed
Article by YANG Qinghua
Article by YAO Lingkan
Article by YANG Ming

地震作用下松散堆积体崩塌的颗粒流数值模拟

杨庆华, 姚令侃, 杨明

西南交通大学土木工程学院, 四川, 成都, 610031

摘要

应用基于离散单元法理论的二维颗粒流数值模拟程序,探讨了松散堆积体在地震诱发作用下的崩塌过程与规律.通过改变堆积体底部边界的角度模拟不同地震烈度对松散堆积体崩塌规律的影响,并将数值模拟结果与离心模型试验结果进行了比较.结果表明:在地震诱发作用下,松散堆积体的崩塌量占崩塌总量的比重,5度地震烈度时约为5%,偏离临界休止角不到1.0;°6度和7度地震烈度时为18%左右,偏离临界休止角1.0°~2.0°;而8度地震烈度时约为45%,已远远偏离临界休止角近10°.研究结果可供山区道路边坡抗震设防及崩塌体对道路、河流的阻塞评价参考.

关键词 颗粒流   数值模拟   地震荷载   松散堆积体   离心模型试验  

Particle Flow Numerical Simulation of Landslip of Loose Slope under Seismic Loading

YANG Qinghua, YAO Lingkan, YANG Ming

School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Abstract:

The landslip process and law of loose slopes under seismic loading were investigated by using PFC2D(particle flow code in two dimensions) based on the discrete element method.In the numerical simulation,the effect of seismic intensity on the landslip of loose slopes was analyzed by changing the angle of underside due to pseudo-static method,and the numerical simulation results were compared with the exsiting centrifugal test ones.The research results show that the landslip law of loose slopes can be analyzed effectively by a particle flow code model.Under seismic intensities of 5,6 to 7 or 8 degree,landslip scale is respectively about 5%,18% and 45%,and departure from the critical slope is less than 1.0°,1.0° to 2.0° and about 10°,respectively.The numerical simulation results are consistent with the exsiting centrifuge experimental ones.The research provides a reference for the aseismatic design of loose slopes and the evaluation of river and road barrage.

Keywords: particle flow   numerical simulation   seismic loading   loose slope   centrifuge model test  
收稿日期 2008-09-02 修回日期  网络版发布日期  
DOI:
基金项目:

国家重点基础研究发展计划资助项目(2008CB425802);国家自然科学基金资助项目(50478085)

通讯作者:
作者简介: 杨庆华(1976- ),男,讲师,博士研究生,研究方向为道路与铁道工程防灾减灾理论与技术,电话:13550235538,E-mail:qhyang@home.swjtu.edu.cn

参考文献:
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[9] 杨庆华,姚令侃,齐颖,等.散粒体离心模型自组织临界性及地震效应分析[J].岩土工程学报,2007,29(11):1630-1635.YANG Qinghua,YAO Lingkan,QI Ying,et al.Analysis of self-organized criticality of centrifugal model tests on granular mixtures and earthquake effect[J].Chinese Journal of Geotechnical Engineering,2007,29(11):1630-1635.
[10] 杨庆华,姚令侃,任自铭,等.地震作用下松散体斜坡崩塌动力学特性离心模型试验研究[J].岩石力学与工程学报,2008,27(2):368-374.YANG Qinghua,YAO Lingkan,REN Ziming,et al.Centrifugal model test on dynamical characteristics of landslips of loose slope under seismic loading[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(2):368-374.
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