[1]顾 金,王运生*,曹文正,等.1786年磨西地震烂田湾滑坡形成机制及过程[J].山地学报,2016,(05):520-529.[doi:10.16089/j.cnki.1008-2786.000158]
　GU Jin,WANG Yunsheng,CAO Wenzheng,et al.Formation Mechanism and Motion Process of Lantianwan Landslide Triggered by the 1786 Moxi Earthquake[J].Mountain Research,2016,(05):520-529.[doi:10.16089/j.cnki.1008-2786.000158]
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1786年磨西地震烂田湾滑坡形成机制及过程()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2016年05期
页码:
520-529
栏目:
山地灾害
出版日期:
2016-09-30

文章信息/Info

Title:
Formation Mechanism and Motion Process of Lantianwan Landslide Triggered by the 1786 Moxi Earthquake
文章编号:
1008-2786-(2016)5-520-10
作者:
顾 金; 王运生*; 曹文正; 张 磊; 黄健龙; 贺建先; 刘 勇
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):
GU Jin; WANG Yunsheng; CAO Wenzheng; ZHANG Lei; HUANG Jianlong; HE Jianxian; LIU Yong
State Key Laboratory of Geohazad Prevention and Geoenvironment Protection/ Chengdu University of Technology, Chengdu 610059, China
关键词:
地震滑坡;  3DEC;  形成机制;  拉裂-水平滑移
Keywords:
earthquake-induced landslide;  3DEC;  formation mechanism;  tension-cracking and horizontal sliding
分类号:
P642.22
DOI:
10.16089/j.cnki.1008-2786.000158
文献标志码:
A
摘要:
大型高位地震滑坡因其瞬时破坏性及灾害链效应而备受关注。通过对1786年磨西73/4级地震触发的泸定烂田湾滑坡深入详细的调查及根据邻近摩岗岭地震动监测成果,分析了滑坡的形成机制,并利用三维离散元模拟软件—3DEC,模拟了滑坡的运动过程。研究揭示,地震波在经过地形及背坡效应放大后,斜坡滑源区地震峰值加速度超过1 g,地震作用首先在强卸荷斜坡后缘沿陡倾坡外的结构面拉裂并向下贯通,随着地震力的持续作用,拉裂面外侧的岩体沿缓倾结构面剪断滑出,因此烂田湾地震滑坡形成机制为拉裂-滑移。滑坡的演化过程为:孕育-启动→高位高速运动→碎屑流→堆积堵江4个阶段。滑坡堵江后形成堰塞湖并在短期内决口。
Abstract:
Largescale high landslides triggered by earthquake are concerned for its instantaneous destructive and disaster-chain effect. Through field investigation on the Lantianwan landslide occurred during 1786 Moxi Earthquake(M=73/4)at Luding,Sichuan, China, this paper reveals its formation mechanism and simulates its movement by 3 Dimensional Distinct Element Code. After seismic wave was amplified through topography and back-slope effects, the seismic peak ground acceleration on the source area of the declivity can exceed 1g. Seismic action firstly led to tensile failure and down along steep oblique external structural planes on the back of the strong unloading slope. With continuous action of seismic force, the rock mass in the outside pull-apart plane was cut and thrown out along the gently dipping structural planes, so the genetic mechanism of the Lantianwan landslide is tension-cracking and horizontal sliding. The evolution of the landslide can be divided into the following four stages:(a)the embryonic and starting stage;(b)the high-position and high-speed motion stage;(c)the debris flow stage; and(d)the accumulation and river stoppage stage. There was a barrier lake after the river stoppage and it burst in a short time.

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相似文献/References:

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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,(05):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.
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备注/Memo

备注/Memo:
收稿日期(Received date):2015-06-23; 改回日期( Accepted):2015-08-22。
基金项目(Foundation item):国家自然科学基金(41521002)。[National Natural Sclence Foundation of China(41521002).]
作者简介(Biography):顾金(1989-),男,四川德阳人,硕士研究生,从事地质工程专业研究。[Gu Jin(1989-),male,Deyang,Sichuan province,M.Sc candidate,engaged in Geological Engineering.]E-mail:735110017@qq.com
*通信作者(Corresponding author):王运生(1960-),男,教授,主要从事工程地质方面的教学工作。[Wang Yunsheng(1960 -),male, professor,principally engaged in engineering geology teaching and research work.]E-mail: wangys60@163. com
更新日期/Last Update: 2016-09-30