摘要
滑坡是汶川地震灾区最主要的次生地质灾害类型,在灾区分布广泛,数量众多,破坏强度大,造成了大量的人员伤亡和安全隐患.首先,从地形地貌、坡体地质结构、地层岩性、地震动、坡体的稳定状态、风化作用和河流作用等方面对汶川地震灾区滑坡形成原因进行研究,断裂带附近强地震动和坡体地质结构是大量滑坡形成的主要原因;其次,对典型实例王家岩滑坡和北川新中滑坡成因进行分析,距离断裂带较近或沿断裂带的强地震动和倾向坡外发育的结构面是滑坡形成的主要原因,而坡度较陡或坡体已经处于欠稳定状态则进一步促进了滑坡的发生.研究成果对地震灾区滑坡灾害的认识和防治有一定的意义.
The landslide is the uppermost type of secondary geological disasters in Wenchuan earthquake disaster area,widely distributed in the disaster area,and its quantity is large,its damage intensity is strong and has caused a large number of casualties and a hidden peril.First of all,the causes of landslides in disaster area are studied from the aspects of topography,geological structure of the slope body,stratum lithology,seismic ground motion,the steady state of the slope,weathering and fluvial action.Strong earthquake ground motion near the fault zone and geological structure of the slope body are the main reasons for the formation of a large number of landslides.Secondly,as a typical example,the causes of Wangjiayan landslide and Xinzhong Landslide are analyzed,and it is discovered that strong earthquake motion near or along the fault zone and the structural planes inclined outwards from the slope are their main reasons,but steeper slope or the slope body in an unsteady state is to further promote the occurrence of landslides.The research achievements are significant for awareness and prevention of landslides in the earthquake disaster areas.
出处
《华北水利水电学院学报》
2011年第5期10-13,共4页
North China Institute of Water Conservancy and Hydroelectric Power
基金
汶川地震地质灾害调查评价项目(1212010914029)
华北水利水电学院高层次人才引进项目(201105)
关键词
坡体地质结构
强地震动
结构面
坡度
破坏过程
geological structure of slope body
strong seismic ground motion
structural plane
slope gradient
failure process
