REMOTE SENSING RESEARCH ON DAGUANGBAO GIGANTIC ROCK-SLIDE TRIGGERED BY WENCHUAN EARTHQUAKE
REMOTE SENSING RESEARCH ON DAGUANGBAO GIGANTIC ROCK-SLIDE TRIGGERED BY WENCHUAN EARTHQUAKE
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发表时间：
2011
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通讯作者：
Yin Yueping
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作者：
Yin Yueping
大光堡巨型滑坡位于安下县高川村。这是2008年5月12日汶川8.0级地震引发的最大滑坡。本文利用地震前后4期高分辨率遥感资料和地面测绘资料，分析了大光堡滑坡的基本特征。其基本特征包括堆积与运动分区、滑面与滑出、体积。将大光宝巨型岩滑分为滑动源、后坳陷、主基岩堆积、下游堆积、上游堆积和前叶。主基岩堆积物为母质层状灰岩岩体结构，微分离，长1100 m，宽490m，平均厚度215m，体积4.64亿m3。根据地形、地貌、采空区、废矿料、棚子前后对比结果，勾勒出滑动方向和边界。基岩滑动距离约1750m。建立了地震前后1 ~ 5000比例尺的数字高程模型，计算了滑坡堆积物的面积和厚度。并利用AutoCAD建立了滑动面的三维实体模型。结果表明，整个大光包巨型滑坡长4300m，宽3500m，最厚550m。碎屑体积约为11.5 ~ 12亿m3。这是近百年来中国乃至世界上最大的滑坡。
The Daguangbao gigantic rockslide is located on the Gaochuan village,Anxia county.It is the hugest landslide triggered by the Wenchuan 8.0 earthquake on May 12 of 2008.This paper uses four periods of remote sensing data with high resolution before/after the earthquake and ground surveying and mapping data to analyze the basic features of the Daguangbao rockslide.The basic features include the accumulation and movement zoning,the sliding surface and exiting,and the volume.The Daguangbao gigantic rockslide is classified into sliding source,back depression,main bedrock accumulation,down-stream accumulation,up-stream accumulation and front lobe.The main bedrock accumulation remained a structure of parent layered limestone rockmass with slight separation that is 1,100m long,490m wide,215m average thick and 464millions m3 in the volume.The sliding direction and bound-ary are outlined according to the compared result before/after topography,geomorphology,and mining adit,waste ore material and sheds.The bedrock sliding distance is about 1750m.A digital elevation model with the scale of 1 to5000 before/after earthquake is established to calculate the area and the thickness of the rockslide accumulation.With the AutoCAD,a 3D entity model of the sliding surface is also established.The result shows the whole Daguang-bao gigantic rockslide is 4300m long,3500m wide and 550m thick in the maximum.The debris volume is about 1.15 ～1.2 billion m3.It is the hugest landslide not only in China,but also in the world in recent hundred years.