降雨条件下浅层滑坡渗流模拟与稳定性探讨  

Seepage simulation and stability analysis of shallow landslide under rainfall condition

作　　者：赵勇[1,2] 刘之葵[1,2] 王晓华 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西岩土力学与工程重点实验室,广西桂林541004 [3]广西地质环境监测总站,广西桂林541004

出　　处：《人民长江》2016年第18期44-49,55,共7页Yangtze River

基　　金：国家自然科学基金项目(51169004);广西自然科学基金创新研究团队项目(2012GXNSFGA060001);广西岩土力学与工程重点实验室项目(15-A-01-01)

摘　　要：为探讨降雨条件下浅层滑坡的渗流情况和稳定性评价方法,采用了geo studio软件的seep/w、slope/w模块以及规范折线法进行研究。结果表明:在模拟的降雨强度和持时下,随着降雨的不断持续,坡体内负孔隙水压力线逐渐消失,孔隙水压力增大;坡体不同位置基覆界面处孔隙水压力值随降雨时间的持续,表现出坡底和中部变化较大,坡顶变化较小;而不同位置坡体表面孔隙水压力随降雨时间的持续大致趋于同一个稳定值;坡顶表面垂深6 m内孔隙水压力变化较大,6 m以下变化微弱。对比2种稳定性评价方法,得到边坡在天然工况下处于稳定状态,在暴雨工况下逐渐趋于不稳定状态。We use seep / w and slope / w modules of geo studio software and specification Polygon method to study the seepage and stability evaluation method of shallow landslide under rainfall condition. The results show that,under simulated rain intensity and duration,the negative pore water pressure line disappears gradually and the pore water pressure increases as the rain continues. On different sites of bedrock cover interface,the variation of pore water pressure is large at the bottom and middle part while small at the top. However,in different slope positions,the surface pore water pressure all tends to stay at the same stable value.The pore water pressure changes significantly at the vertical depth of 6m from the top of the landslide but changes slightly below6 m. Comparing the two stability evaluation methods,we conclude that the slope is still in stable state under natural condition but turns into unstable under rainstorm.（ 1. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China ; 2. Guangxi Key Labora- tory of Geomechanics and Geotechnical Engineering, Guilin 541004, China; 3. Provincial Station of Geological and Environmental Monitoring of Guangxi , Guilin 541004, China）

关 键 词：GEO STUDIO 渗流分析 稳定性分析 浅层滑坡 

分 类 号：P642[天文地球—工程地质学]