Analysis on the Dynamical Process of Donghekou Rockslide-Debris Flow Triggered by 5.12 Wenchuan Earthquake

查看全文 作　　者：SUN [1,2]Ping;ZHANG [1,2]Yongshuang;SHI [1,2]Jusong;CHEN [3]Liwei

机构地区：[1]Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing, China;[2]Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, China;[3]China Nuclear Power Engineering Corporation, Ltd., Beijing, China

出　　处：《Journal of Mountain Science》索引2011年第8卷第2期,共9页

基　　金：supported by the National Natural Science Foundation of China (NSFC) (Grant No. 40802067);the National Basic Research Program of China (973 program, Grant No.2008CB425803);the Basic Scientific Research Operating Expenses of Institute of Geomechanics, CAGS (Grant No. DZLXJK200805);the Land and Natural Resources of China (Grant No. 1212010914025) 摘　　要：Among the geo-hazards caused by the great Wenchuan Earthquake, the rapid and long runout rockslide-debris flow is of primary concern due to the large volume of displaced material and the resultant catastrophic impacts to the landscape and socioeconomic structure. In order to analyze the dynamical process of this kind of geo-hazard, the Donghekou rockslide-debris flow is given as an example in this paper. This event, which killed 780 people, initiated at an elevation of 1300 m with a total long run-out distance of more than 2400 m. The slide mass is mainly composed of dolomite limestone and siliceous limestone of Sinian system, together with carbon slate and phyllite of Cambrian. During the processes from slide initiation to the final cessation of slide movement, five dynamic stages took place, here identified as the initiation stage, the acceleration of movement stage, the air-blast effect stage, the impact and redirection stage and the long runout slidematerial accumulation stage. Field investigations indicate that due to the effects of the earthquake, the dynamics of the Donghekou rockslide-debris flow are apparently controlled by geologic and tectonic conditions, the local geomorphological aspects of the terrain, and the microstructural and macroscopic mechanical properties of rocks which compose the slide mass. These three main factors which dictate the Donghekou rockslide-debris flow dynamics are discussed in detail in this paper, and significant results of field investigations and tests of materials are presented. The above dynamical processes are analyzed in this paper, and some useful conclusions have been gained. 关键词：流动力学泥石流大地震滑坡河口进程汶川引发

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Analysis on the Dynamical Process of Donghekou Rockslide-Debris Flow Triggered by 5.12 Wenchuan Earthquake

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