[1]申 通,王运生,张云辉.皂角沱崩塌形成机制数值模拟[J].山地学报,2016,(04):442-450.[doi:10.16089/j.cnki.1008-2786.000149]
　SHEN Tong,WANG Yunsheng,ZHANG Yunhui.Numerical Simulation of Formation Mechanism of the Zaojiaotuo Collapse[J].Mountain Research,2016,(04):442-450.[doi:10.16089/j.cnki.1008-2786.000149]
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皂角沱崩塌形成机制数值模拟()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2016年04期
页码:
442-450
栏目:
山地灾害
出版日期:
2016-08-01

文章信息/Info

Title:
Numerical Simulation of Formation Mechanism of the Zaojiaotuo Collapse
文章编号:
1008-2786-(2016)4-442-09
作者:
申 通; 王运生; 张云辉
地质灾害防治与地质环境保护国家重点实验室/成都理工大学,四川 成都 610059
Author(s):
SHEN Tong; WANG Yunsheng; ZHANG Yunhui
State Key Laboratory of Geohazad Prevention and Geoenvironment Protection/Chengdu University of Technology, Chengdu 610059, China
关键词:
皂角沱崩塌;  陡倾顺层岩质斜坡;  形成机制分析;  不连续变形分析(DDA)
Keywords:
Zaojiaotuo collapse;  steep bedding rock slope;  formation mechanism;  Discontinuous Deformation Analysis(DDA)
分类号:
P642.21
DOI:
10.16089/j.cnki.1008-2786.000149
文献标志码:
A
摘要:
以位于“5·12”汶川大地震震中区的皂角沱崩塌为研究对象,通过对崩塌所处的自然地理、工程地质环境进行野外调查,分析崩塌的发育特征; 采用不连续变形分析软件DDA,对坡体失稳崩塌的全过程进行模拟研究。结果表明,斜坡地形放大效应在震中区是客观存在的,具倾向坡外的陡倾控制性结构面的高陡突出地形对地震波具有明显的放大作用。该坡体崩塌失稳模式为:峰值加速度放大→增加的振幅迫使岩体沿陡倾坡外的控制性结构面迅速拉裂→沿滑动面发生崩滑→高速脱离滑源区→巨大的势能和动能驱动块体做长距离运动。通过数值模拟可知,随着斜坡坡高的增大,地震加速度和速度无论是在水平向,还是在竖直向均存在放大效应,但是水平向的放大效应较竖直向更明显; 结构面监测点的加速度和速度放大系数相比稳定的坡体要大得多,地震袭来,当遇到陡倾坡外的不连续结构面时,斜坡动力响应强烈,最终危岩体沿控制性结构面发生崩滑破坏。
Abstract:
5.12 Wenchuan earthquake induced extensive collapse disasters in the epicentral area, which has caused huge losses to the local people's lives and property. In this paper, we choose the Zaojiaotuo collapse in the epicentral area as research object, based on detailed field investigation of the collapse's natural geography and engineering geological environment, analyses and judge the development characteristics of the collapse masses. Using the Discontinuous Deformation Analysis software,DDA, to simulate the whole process of the landslide. The results show that, slope topography amplification effect in the epicentral area performs significantly,a high and steep terrain with an inclined bedding slope controlled by steep structure plane, has a significant amplified effect on seismic wave. Amplify peak acceleration→the increasing amplitude forces rock mass along the controlling structure planes which parallel with slope to crack quickly→rock masses collapse along the slip surface→high-speed detach from the slipping source region→huge potential and kinetic energy drive rock mass to do long-distance movement. The numerical simulation analysis shows that, with the increase of slope height, particles' acceleration and velocity in the slope body has significant terrain amplification effects under the action of seismic force. However, the horizontal magnification effect is more obvious than the one of the vertical direction. The amplification factor of monitoring point's acceleration and velocity in structure plane is much greater than that in the stable slope, when seismic waves face with discontinuously steep structural surfaces which incline to the slope outside, the dynamic response of slope becomes strong and eventually lead to slope's instability.

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备注/Memo

备注/Memo:
收稿日期(Received date):2015-09-05; 修回日期(Accepted):2015-10-19。
作者简介(Biography):申通(1988-),男,河南省平顶山市人,博士研究生,从事地质工程专业研究。[Shen Tong(1988-),male,born in Pingding Shan people,Henan province,Ph.D Candidate,Engaged in Geological Engineering.] E-mail:2276522564@qq.com
更新日期/Last Update: 2016-07-30