【作者】 余业； 黄润秋； 巨能攀； 赵建军； 李果；

【Author】 YU Ye HUANG Runqiu JU Nengpan ZHAO Jianjun LI Guo (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059)

【机构】 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；

【摘要】 "5.12"汶川地震触发崩滑灾害具有一些特殊的破坏机制和动力过程,沿断裂带出现多处抛射型崩塌和滑坡。本文以位于北川映秀断裂带通过部位的高川乡大竹坪崩塌为例,在现场调研的基础上,研究了强震作用诱发山脊整体、高速抛射型崩塌的形成机理和运动过程,并根据坡体实际抛射距离反演分析了考虑地形放大效应的地震水平和竖直加速度值。研究结果表明,强震条件下P波的垂直上抛作用和S波的水平剪切作用造成岩体结构面贯通,后至的面波经地形放大后,产生巨大的水平加速度和垂直加速度,将斜坡上部高位岩体斜向上抛出,形成地震高位崩塌,成灾快,致灾重。更多还原

【Abstract】 Landslide hazards triggered by "5.12" WenChuan earthquake have special dynamic process and failure mechanisms,along the fault zone developed many rock block ejection and landslides.This paper is based on the Dazhuping collapse through Beichuan-Yingxiu fault in Gaochuan,by the investigation on the scene,majorly studied the formation mechanism and motion process of a whole ridge and high-speed rock block ejection triggered by Wen-chuan earthquake,and according to the actual ejection distance,calculating the topographic amplification horizontal and vertical earthquake acceleration.The results show that under strong earthquake,the structural plane of rock mass cut by cranny by upper throwing force of P-wave and horizontal shear force of S-wave,the surface wave with huge horizontal and vertical acceleration arrives last and is enlarged by terrain,the powerful earthquake force throw the whole rocks to the inclined top,forming collapse,causing a disaster.更多还原