都江堰庙坝地震高位滑坡特征与成因机理研究

苟富刚; 王运生; 吴俊峰; 陈宁; 邓茜

都江堰庙坝地震高位滑坡特征与成因机理研究

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成都 610059

基金项目:

中国地质调查局项目(1212010914010)资助

详细信息

作者简介:
苟富刚,主要从事工程地质、岩体稳定性等方面的研究工作.Email: 574289742@qq.com

中图分类号: P642.22
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出版历程
- 收稿日期: 2011-05-10
- 修回日期: 2011-09-30
- 刊出日期: 2012-02-25

CHARACTERISTICS AND FORMATION MECHANISM OF HIGH SLOPE LANDSLIDE INDUCED BY WENCHUAN EARTHQUAKE IN MIAOBA COUNTY OF DUJIANGYAN CITY

State Key Laboratory of Geo-hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu 610059

摘要

摘要: 5 12 汶川地震诱发了数以万计的滑坡,其中有一类地震高位滑坡呈现出不同于典型滑坡破坏运动模式,都江堰市虹口乡庙坝滑坡就是其中的典型代表。庙坝滑坡位于龙门山中央断裂带中段,滑坡方量约113104m3。作者通过对庙坝滑坡详细深入调查和综合分析,力求揭示该滑坡的特征及形成机制,并且对该滑坡进行了详细分区。根据该滑坡的分区及动力特征,作者认为其形成过程可概括为:孕育-启动加速-高速运动-停积堆积。在孕育阶段,作者把强震对斜坡岩体产生的加速度耦合坡体结构解释了其高速剪出的原因,其成因模式类似于拉裂-散体滑移拉裂-顺层滑移的空间组合; 在启动高度运动阶段,作者耦合该滑坡地形地貌,对抛射体进行了运动程式分析,该滑坡平均运动速度为20.1m s-1,整个形成过程仅用了32s; 在停积堆积阶段,作者耦合坡体植被及微地貌解释了上部堆积区(Ⅲ1)形成的特殊性。基于以上滑坡形成机制的分析,作者得出地球内外动力的耦合作用正是该地震高位滑坡形成的原因。
- 汶川地震 /
- 高位滑坡 /
- 碎屑流 /
- 成因机理
Abstract: The 5 12 Wenchuan Earthquake induced tens of thousands of landslides.The high landslide induced by the earthquake presents a unique mountain motion and failure model comparing with the landslide induced by gravity.The Miaoba landslide is a typical representative.The Miaoba landslide lies in the middle of the central fault zone of Longmen Mountains.The intensity of the landslide area is Ⅺ.The landslide volume is about 113104m3.Through the field investigation and synthetic analysis,this paper strives to reveal its characteristics and formation mechanism.It takes a detailed partition of the landslide.According to the partition and dynamic characteristics of the landslide,its process can be divided into the following four stages: (a)the embryonic stage; (b)the starting and accelerating stage; (c)the high-speed motion stage; and (d)the stop and accumulation stage.At the embryonic stage,the reasons of the slope rock mass cutting out with high-speed are explained.The reasons are that the earthquake produced the acceleration coupling slope body structures.Its genetic model is the spatial combination of the crack-granular slipping and then the crack-bedding slipping. between the starting and accelerating to the high-speed motion stage,the paper analyzes the movement program of the projectile coupling the landslide topography.The research shows that the landslide from start-up to end only took 32s, and the average speed was about 20.1m s-1.At the stop and accumulation stage,the paper explains the peculiarity of the accumulation(Ⅲ1)area formation coupling trees of the slope and micro-topography.Based on the above analysis of formation mechanism of the landslide,the paper obtains that the functions of coupling dynamic of the internal and external earth are the reasons of forming the high landslide induced by earthquake.
- Wenchuan earthquake /
- High landslide /
- Debris flow /
- Formation mechanism

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参考文献(1)

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