基于竖直激励的滑坡体加速度响应研究  

Study on acceleration response of landslide mass based on vertical excitation

作　　者：纪志阳 吴红刚 赖天文[1] JI Zhiyang;WU Honggang;LAI Tianwen(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730000,China;China Northwest Research Institute Co.Ltd.of CREC,Lanzhou,Gansu 730000,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730000 [2]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《岩石力学与工程学报》2021年第S01期2790-2797,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划资助(2018YFC1504901);甘肃省自然科学基金项目(145RJZA068)。

摘　　要：为研究竖向地震作用下多滑面滑坡体变形机制及加速度响应情况,以玉树机场路滑坡群0#滑坡第七条块为例,借助4种地震强度、4种加载工况下的振动台模型试验方法,重点研究多滑面滑坡体受竖直激励作用下,水平、竖直方向的加速度峰值与加速度时程曲线,进而分析地震波对多滑面滑坡体的变形破坏机制,研究结果表明:(1)各测点加速度随输入地震波动能的增大而呈现增长的趋势;(2)沿着滑带方向,随着高程的不断增加,加速度峰值逐步增大;(3)在A6-1~A6-4竖直断面处,滑带内部的加速度峰值大于基岩与滑体内部的加速度峰值,且滑带对地震波动能具有一定的吸收作用;(4)受采集方向的影响,滑带内部竖直向加速度峰值约为水平向的2~6倍。To study the deformation mechanism and acceleration response of the multi-sliding surface landslide body under the action of vertical earthquakes,take the seventh block of the Yushu Airport Road landslide group#0 landslide as an example,we carried out shaking tables test under 4 earthquake intensities and 4 loading conditions.The model test focuses on the horizontal and vertical accelerations peak and time-history curves of the multi-slip surface landslide body subjected to vertical excitation,and then analyzes the deformation and failure mechanism of the multi-slip surface landslide body.The results show that:with the continuous increase of the input seismic wave energy,the acceleration peak of each measurement point increases obviously.Along the sliding belt,with the continuous increase of the elevation,the acceleration peak increases gradually.In the vertical section A6-1‐A6-4 points,the acceleration peak inside the sliding zone is greater than the bedrock and sliding body,and the sliding zone has a certain absorption effect on seismic wave energy.The vertical acceleration peak inside the sliding zone is approximately horizontal 2 to 6 times.

关 键 词：边坡工程 竖直激励 加速度响应 振动台试验 

分 类 号：P642[天文地球—工程地质学]