甘草村古滑坡形成机制及堆积体稳定性分析  

Formation mechanism of Gancaocun ancient landslide and analysis of accumulation body stability

作　　者：刘江伟 王运生[1] 金刚 赵波[1] 向超 LIU Jiangwei;WANG Yunsheng;JIN Gang;ZHAO Bo;XIANG Chao(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]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

出　　处：《中国科技论文》2020年第9期1019-1025,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(41877235,41521002);国家重点研发计划项目(2017YFC1501000)。

摘　　要：甘草村滑坡是大渡河中游一典型的巨型花岗岩质古滑坡,为研究此滑坡的形成过程及堆积体稳定性,在现场大比例工程地质测绘的基础上进行了滑坡调查,建立了滑坡堆积体地质模型,并采用FLAC^3D进行堆积体稳定性数值模拟。得出甘草村古滑坡的形成机制为:高位坡体卸荷产生大量的节理裂隙在强震作用下使得坡体失稳,造成堰塞后经历了翻坝侵蚀,形成了现有的两岸堆积地貌。FLAC^3D数值模拟分析结果表明:该古滑坡堆积体在自然状态下基本处于稳定状态,不会发生大规模的古滑坡复活。通过监测点及位移云图发现:两岸堆积体前缘有局部小区域发生小型浅表层位移变形现象,易发生小规模的滑塌,这与现场调查情况吻合。该研究对在强震区域滑坡的形成机理以及堆积体的治理有着重要的指导意义。The Gancao Village landslide is a typical giant granite ancient landslide in the middle reaches of the Dadu River.In order to study the formation process of this landslide and the stability of the accumulation body,this paper conducts landslide survey on the basis of large-scale engineering geological surveying and mapping on site,and establishes a landslide accumulation body geological model And FLAC^3D is used to carry out numerical simulation of the stability of the accumulation.It is concluded that the formation mechanism of the ancient landslide in Gancao Village is:the unloading of the high-level slope body produces a large number of joint fissures,which makes the slope body instability under the action of strong earthquakes.FLAC^3D numerical simulation analysis results show that the ancient landslide accumulation body is basically in a stable state under natural conditions,and large-scale ancient landslide resurrection will not occur.Through monitoring points and displacement cloud maps,it is found that there is a local small area in the front edge of the accumulation body on both sides of the bank.Small-scale displacement and deformation of the shallow surface are prone to small-scale landslides,which is also consistent with the on-site investigation.The research has important guiding significance for the formation mechanism of landslides in strong earthquake regions and the treatment of accumulations.

关 键 词：古滑坡 堆积体稳定性 形成机制 FLAC^3D数值模拟 

分 类 号：P642[天文地球—工程地质学]