三峡库区某库岸滑坡地震动力响应机制分析

发布时间：2018-11-26 13:15

【摘要】：以三峡库区某库岸滑坡为模型,进行地震作用下的动态响应分析。综合运用Geo-Studio中Quake、Seep、Slope模块,分析库岸滑坡地震作用下的动态响应。结果表明:(1)滑坡在地震作用下,出现一个类似于"鞭梢效应"的现象,上部表层振幅大于下部,且上下部存在变形不同步,整体呈现出"S"型变形迹象;(2)滑坡整体呈现出不同程度的加速度放大作用,且放大的程度和坡体地形起伏及整体坡度有关;(3)库岸前缘首先发生液化现象,随着地震的持续,液化区沿着滑面向上蔓延,而中部表层极难发生液化,最后后缘也呈现出局部液化或者微弱液化的趋势;(4)考虑超孔隙水压力、地震惯性力及强度折减后的滑坡稳定系数远小于1,滑面处平均加速度大于某一临界值时会发生不可逆塑性变形。研究所得结果为水库滑坡治理提供参考。
[Abstract]:The dynamic response analysis of a reservoir bank landslide in the three Gorges reservoir area was carried out under earthquake action. The dynamic response of landslide earthquake in reservoir bank is analyzed by using Quake,Seep,Slope module in Geo-Studio. The results show that: (1) under earthquake action, the landslide appears a phenomenon similar to "whipping effect", the amplitude of the upper surface layer is larger than that of the lower part, and the deformation of the upper and lower parts is out of sync, showing the "S" deformation sign as a whole; (2) the whole landslide shows different degree of acceleration amplification, and the degree of amplification is related to the topographic fluctuation and the overall slope of the slope; (3) the first liquefaction occurred in the front edge of the reservoir bank. With the continuation of the earthquake, the liquefaction zone spread along the sliding direction, but the surface layer in the middle area was very difficult to liquefy, and the final rear edge also showed a tendency of local liquefaction or weak liquefaction. (4) considering the excess pore water pressure, the landslide stability coefficient after seismic inertia force and strength reduction is far less than 1, and the irreversible plastic deformation will occur when the average acceleration of the slide surface is greater than a certain critical value. The results of the study provide a reference for the landslide treatment of the reservoir.
【作者单位】：三峡大学土木与建筑学院;三峡地区地质灾害与生态环境湖北省协同创新中心;湖北长江三峡滑坡国家野外科学观测研究站;三峡大学科技学院;
【基金】：国家自然科学基金项目(41302260) 三峡大学硕士学位论文培优基金(2016PY014) 湖北省科技支撑计划项目(2015BCE070) 湖北省自然科学基金创新群体项目(2015CFA025) 防灾减灾湖北省重点实验室开放基金(2016KJZ16)
【分类号】：P642.22

【参考文献】