清江水布垭库岸木竹坪滑坡失稳探讨  

Failure Mechanism of Muzhuping Landslide in Shuibuya Reservoir Area,Qingjiang River

作　　者：张丽芬[1] 魏贵春[1] 曾夏生 廖武林[1] 

机构地区：[1]中国地震局地震研究所,武汉430071 [2]湖北中南勘察基础工程有限公司,武汉430081

出　　处：《长江科学院院报》2009年第4期13-17,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家科技支撑项目(2006BAC01B04-02-02);中国地震局地震研究所基金项目(IS200756052)

摘　　要：木竹坪滑坡发生于2007年5月10日,总方量约800万m3,是水布垭库岸的重大滑坡灾害之一。根据实地调查资料,阐述了滑坡区基本地质条件及滑坡基本地质地貌特征。结合滑坡稳定性计算分析了滑坡的成因机制,认为木竹坪滑坡的发生是内外因共同作用的结果。坡体前缘受清江支流的弧形切割,为滑坡提供了临空条件,而薄层灰岩及第四系坡积物又为易发生滑坡的地层岩性条件。在内部条件具备的前提下,滑坡发生前的连续降雨及水库蓄水均使得坡体物质的力学强度降低,故引发了大规模的滑坡失稳。Muzhuping landslide, 700 million m^3 in volume, which occurred in the Shuibuya Reservoir area on May 10, 2007, is one of the serious landslide disasters in this area after second stage impounding. And it caused a serious loss of property. According to the on-the-spot survey on this landslide, the paper introduces the geological background in landslide area and the geologic and geomorphic characteristics. By means of the landslide stability calculation, it is considered that the occurrence of Muzhuping landslide was the union action result of inner and outer causes. The front area of the landslide was cut by the branch of Qingjiang River, which offered a free face. And the thin-layer limestone and quaternary alluvial purple soil easily inclined to slide. The result shows that the vulnerably geological structure of landslide body, concentrated rainfall and reservoir impoundment caused this landslide.

关 键 词：滑坡 地质特征 滑坡成因 水布垭水库蓄水 

分 类 号：P642.22[天文地球—工程地质学]