两河口水库区索依村滑坡形成机制及稳定性评价  

FORMING AND STABILITY EVALUATION OF SUOYI VILLAGE LANDSLIDE IN LIANGHEKOU

作　　者：朱容辰[1] 沈军辉[1] 刘毅[1] 张云祥[1] 顾涛[1] 章志锋[1] 

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：《地质灾害与环境保护》2008年第4期77-80,共4页Journal of Geological Hazards and Environment Preservation

基　　金：国家自然科学基金资助项目(40372136)

摘　　要：索依村滑坡位于两河口水电站近坝库区,为一古滑坡。本文从斜坡地质结构分析入手,结合雅砻江河谷地貌演化,分析了滑坡的形成演化机制,进而评价了滑坡的稳定性。研究结果表明,滑坡发生于陡立板岩顺向层状结构斜坡中,其变形破坏模式为倾倒弯曲-拉裂型,形成于雅砻江Ⅲ级阶地形成以后至Ⅱ级阶地形成前的河谷快速下切期。是在河谷强烈下蚀作用及凹岸侧蚀作用下,斜坡岩体发生侧向卸荷,并在重力场作用下发生倾倒弯曲拉裂变形而形成。滑坡现状处于稳定状态,两河口水电站施工期导流围堰回水情况下,整体处于基本稳定状态,对水电工程施工安全不会带来重大影响。Suoyi village landslide is an ancient landslide, which is located in the reservoir area of Lianghekou hydropower sta- tion. Started from the analysis of geological structure, combined with the landscape evolution of the Yalong River Valley, this article analyzed the formation cause and evolution process of the landslide, then evaluated its stability. The study results show that the landslide occurred in steep slate with layered-structure slope. The deformation and failure mode of the landslide is dumping-bending-pulling type. It formed in the period when the Valley cut down,which is after Yalong River Ⅲ terraces and before Ⅱ terraces formed. With the intense fluvial and concave bank erosion of the Valley, the slop rock unloaded to the other side, together with the gravity, the landslide finally formed after dumping, bending and pulling. The landslide is currently in a stable condition. It will stay stable in the situation when the Lianghekou hydropower station construction period and return wa- ter diversion cofferdam. It will not largely affect the security of the hydropower station construction.

关 键 词：索依村滑坡 倾倒弯曲一拉裂 结构特征 成因机制 稳定性 

分 类 号：P642.22[天文地球—工程地质学]