[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 Jinpeng; LI Yusheng; ZHANG 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
Keywords:
seismic landslide;  dynamic thixotropic;  rotating friction;  dynamic response
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。
Abstract:
Large-scale hard rock landslides and small-scale soft rock landslides are common, but the large scale soft rock landslide is rare. To investigate low intensity earthquake induced large-scale dynamic mechanism of soft rock landslide, this paper adopts uniaxial cyclic dynamic loading test and two-dimensional numerical simulation based on discrete element etc., studied the dynamic-attenuating of rock strength, the dynamic response of isolated outstanding landscape and landslide formation mechanism. Results showed that: 1.The dynamic response of "cracked" mudstone is sensitive and easy to collapse shattered into pieces; 2. Dynamic response for protruding soft rock ridge is very strong, with peak horizontal and vertical accelerations at -4.2～7.8 m/s2 and -17.0～9.0 m/s2, respectively, far above the bedrock's 0.0～1.5 m/s2; 3.Model 2 after fragmentation process, the simulation results are consistent with the actual situation; 4. "Cracked" fractured mudstone collapsed under vibration, and the shear slip transform level control plane friction into rotation of the friction which controlled by fractured mudstone。Controlled by the mechanism, friction resistance drastically reduced of shear plane, the shear displacement mutated and the mountain destroyed rapidly. The author will call this particular genetic mechanism is that “cracked” shale “power thixotropic disintegration” effect which at the bottom of isolated mountain.

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　LI Xiuzhen,KONG Jiming,et al.Types and Characteristics of Typical Landslides Triggered by “5.12” Wenchuan Earthquake[J].Mountain Research,2011,(02):598.
[2]康来迅,王建荣.昌马断裂带地震滑坡的展布特征[J].山地学报,1995,(01):35.
[3]杨涛,邓荣贵,刘小丽.四川地区地震崩塌滑坡的基本特征及危险性分区[J].山地学报,2002,(04):456.
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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