西藏俄拉村滑坡地震动态响应失稳过程  

Analysis on Failure Process and Seismic Response of Ela Village Landslide in Tibet

作　　者：雷清雄 王运生[1] 贺建先 陈明[1] 申通[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

出　　处：《山地学报》2017年第3期332-339,共8页Mountain Research

基　　金：地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2015Z001);国家自然科学基金:创新研究群体科学基金(41521002)~~

摘　　要：为了研究岩浆岩质边坡在地震作用下的动力响应特征和失稳过程,以西藏俄拉村滑坡为原型建立离散元数值模型,通过输入实测地震动数据,研究该斜坡在地震作用下的动力响应特征和失稳破坏过程。模拟结果表明:(1)俄拉村滑坡失稳过程为:震动拉裂-剪切阶段→"锁固段"剪断贯通阶段→堆积掩埋夯实阶段;(2)水平向地震加速度PGA具有高程放大效应,且在相同高程坡面PGA放大系数较坡体内部大,坡形转折处和坡体凸出部位的放大效应也表现为坡面较坡内显著;(3)水平向地震加速度PGA值自坡体内部向外表现为时而增大、时而减小的节律性规律。研究结果可为岩浆岩质边坡在地震作用下的失稳模式提供依据。Based on prototype of Ela village landslide at Tibet,a discrete element numerical simulation model was carried out to study seismic responses of the slope and its unstable failure process. We used a commercial software UDEC to conduct the seismic responses under dynamic loads which were monitoring seismic data. The main numerical simulation results could be summarized as follows：（ 1） The failure process of Ela village landslide was divided into three stages,i. e.,vibration tension cracking and shearing stage→ ＂ locked section＂ cutting through stage→accumulation and buried compaction stage;（ 2） the horizontal PGA amplification factor increased with elevation and the factor on the surface was larger than the inner,and the amplification effect was obvious at the slope break or convex slope;（ 3） the monitoring data revealed that the horizontal PGA varied with the rhythmic regularity of increasing intervals from inner part to slope surface. The results provided a reference for the mechanism of slope failuure under earthquake.

关 键 词：俄拉村滑坡 失稳过程 地震动响应 离散元模拟 

分 类 号：TU457[建筑科学—岩土工程]