基于离散元数值模拟的四川薛城南沟滑坡形成机制分析  

Discrete element simulation analysis of formation mechanism of Nangou landslide in Xuecheng city

作　　者：古德章 王运生[1] 杨青[2] 申通[1] 贺建先 顾金[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,四川成都610059 [2]成都理工大学商学院,四川成都610059

出　　处：《中国地质灾害与防治学报》2016年第4期24-30,共7页The Chinese Journal of Geological Hazard and Control

基　　金：中国地质调查局项目(1212011220154);国家自然科学基金(41072231)

摘　　要：根据南沟滑坡的地质背景及堆积体工程地质特征,结合离散元数值模拟技术,分析南沟滑坡的失稳类型及其成因机制。研究得出如下结论:(1)地震波在经过地形效应放大后,斜坡滑源区竖直峰值加速度PGA最大放大5.1倍,水平峰值加速度PGA最大放大3.97倍。(2)运用离散元数值模拟技术,验证了该斜坡体在地震力作用下的滑坡类型为拉裂—溃滑型。(3)在强震作用下,地震波在坡体内不连续结构面处会发生透射和反射现象,从而导致岩体沿层面发生震动溃裂破坏,形成潜在统一滑面,并伴随有坡体的松弛、甚至解体;在强震持续作用下,坡体沿滑面产生整体的溃滑,形成滑坡。According to the deposit of Nangou landslide＇s geological background and it＇s accumulation body engineering geology features,combined discrete element numerical simulation,analysis Nangou landslide＇s instable type and genetic mechanism. Through the research and analysis,we can get conclusions as follows：First,seismic wave shows that slope sliding source area of the vertical peak acceleration PGA magnify 5. 1times,horizontal peak acceleration PGA magnify 3. 97 times after enlarged terrain effect. Second,using discrete element numerical simulation technology to validate the landslide types of slope body under earthquake force is cracking-collapse sliding model. Third,under the action of violent earthquake,seismic wave will happen projection and reflection phenomenon in the body of the discontinuous interface,resulting in rock mass crack along the rock surface,forming a unified and potential sliding surface,being accompanied by relaxation of the slope and even collapse. Under the action of earthquake continued,slope produce the overall collapse slide along the slip surface,formation of landslides.

关 键 词：地震滑坡 形成机制分析 离散元数值模拟 

分 类 号：P642[天文地球—工程地质学]