雅砻江甲西滑坡倾倒弯曲-拉裂形成机制研究  

Research on Bending and Sliding Deformation Failure Mechanism of Jiaxi Landslide of Yalong River

作　　者：苗朝[1] 沈军辉[1] 杨佳丽[1] 徐久燕[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：《防灾减灾工程学报》2015年第3期411-417,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：高等学校博士学科点专项科研基金项目(20125122110005)资助

摘　　要：在工程地质勘察的基础上,通过建立边坡地质结构模型,用模拟重力场条件的底摩擦模型试验、二维离散元和有限元相结合的方法,研究了雅砻江甲西滑坡的变形破坏过程及影响因素。结果表明,甲西滑坡的变形破坏模式为逆向层状结构岩体向临空面倾倒弯曲、层间相互错动形成贯通拉裂缝失稳下滑的典型倾倒弯曲-拉裂式。滑坡形成的主要因素为,在暴雨等作用下中-陡倾层状岩体、高陡坡型、河谷下切临空条件及倾外节理发育有发生滑动复活的可能。In order to reproduce the deformation and failure process and analyze the deformation failure mode of Jiaxi landslide,based on the geologic structure model and the base contact friction experiment method,the evolution and characteristics of bending deformation are studied and the discrete element numerical simulation is also used for comparison.The experimental results show that the deformation and failure mode of Jiaxi landslide is typical bending and sliding,in which the anti-inclined stratified rock mass bends towards the free surface,the interlayer dislocates to form the tensile crack and slide instability.The main factors for the formation of Jiaxi landslide are steep dip layer rock mass,highly steep slope type,free surface and bedding outside joint development.Under the rainstorm the action of secondary slide revival may occur.

关 键 词：甲西滑坡 倾倒拉裂 底摩擦试验 数值模拟 形成机制 

分 类 号：O353.1[理学—流体力学] TU81[理学—力学]