[1]王金鹏,李渝生*,张 超.软岩区低强度地震诱发大规模滑坡的机理——以重庆小南海历史地震滑坡为例[J].山地学报,2016,(02):200-207.[doi:10.16089/j.cnki.1008-2786.000119]
 WANG Jinpeng,LI Yusheng,ZHANG Chao.Dynamics Mechanism of Low-intensity Earthquake Triggered theCollapse of the Soft Rock: Xiao Nanhai Seismic Landslide in Chongqing of China as an Example[J].Mountain Research,2016,(02):200-207.[doi:10.16089/j.cnki.1008-2786.000119]
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软岩区低强度地震诱发大规模滑坡的机理——以重庆小南海历史地震滑坡为例()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2016年02期
页码:
200-207
栏目:
山地灾害
出版日期:
2016-04-01

文章信息/Info

Title:
Dynamics Mechanism of Low-intensity Earthquake Triggered the Collapse of the Soft Rock: Xiao Nanhai Seismic Landslide in Chongqing of China as an Example
作者:
王金鹏李渝生*张 超
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, 四川 成都 610059
Author(s):
WANG JinpengLI YushengZHANG Chao
State Key Lab. of Geo-hazard Prevention and Geo-environment Protection / Chengdu University of Technology,Chengdu 610059,China
关键词:
地震滑坡 动力触变 转动摩擦 动力响应
分类号:
P315.2,P642.22
DOI:
10.16089/j.cnki.1008-2786.000119
文献标志码:
A
摘要:
为研究低强度地震在软岩区诱发大规模滑坡的动力学机理,通过现场调查采样,采用单轴动循环荷载试验及离散元数值模拟分析方法,对岩体强度的动力衰减问题﹑孤立突出地形的动力响应以及滑坡形成机理研究。结果表明:1.“龟裂状”泥岩的动力响应极为敏感,极易崩解裂离成碎裂岩块; 2.高陡孤立状软质岩山体的动力放大效应十分强烈,山体内部最大水平及竖向加速度分别为-4.2~7.8 m/s2及-17.0~9.0 m/s2,远高于基岩的0~1.5 m/s2; 3.经过碎裂化处理的模型2,模拟结果与实际一致; 4.“龟裂状”泥岩的震动崩解碎裂,导致山体剪切滑移形式由泥岩层面控制的平面摩擦型,转变为受泥岩振动碎裂带控制的转动摩擦滑动(甚至滚动摩擦)。受此机理控制,剪切面摩阻力急剧降低,剪切位移发生突变,山体迅速崩解破坏。这种特殊的成因机理,称之为孤立山体底部“龟裂状”泥岩层的“动力触变崩解”效应。

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备注/Memo

备注/Memo:
收稿日期(Received date):2015-03-16; 修回日期(Accepted):2015-04-24。 基金项目(Foundation item):地质灾害与地质环境保护国家重点实验室自主研究项目(40100-00002219)。[Supported by the independent research projects of State Key Lab.of Geo-hazard Prevention and Geo-environment Protection(40100-00002219).] 作者简介(Biography):王金鹏(1989-),男(汉),籍贯陕西省,硕士研究生,专业方向为岩土体稳定及工程环境效应。[Wang Jinpeng(1989-), male(Han), born in Shaanxi, graduate student for Master Degree, major in rock and soil stability and environmental effects of the project.] *通信作者[Corresponding author]:李渝生[Li Yusheng],E-mail:liyusheng@cdut.cn
更新日期/Last Update: 1900-01-01