降雨作用下不同渗透性系数对滑坡稳定性的影响  

Different Permeability Coefficient under Precipitation Effects on Slope Stability

作　　者：王力[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《浙江水利科技》2013年第4期1-6,13,共7页Zhejiang Hydrotechnics

基　　金：国家自然基金重点项目(编号:50839004);三峡库区三期地质灾害防治重大科学研究项目(SXKY3-2-1);三峡大学研究生科研创新基金(2012cx023)

摘　　要：近年来,三峡库区库岸滑坡调查发现,库区滑坡的稳定性与降雨密切相关,以三峡库区秭归县某滑坡为研究对象,分别取3种不同的饱和渗透性系数,通过不同周期降雨强度理论计算得到滑坡区域各强度降雨值。利用有限元计算软件,模拟研究了该滑坡在不同降雨强度作用下渗流场的变化情况,并根据渗流结果计算得到该滑坡在20 a一遇降雨强度下稳定性系数表。研究表明,当滑坡遭遇持续性强降雨时,渗透性系数越小的滑坡稳定性越低。Recent investigations on landslides at Three Gorges area find that the slope stability is closely connected with precipitation.Using a landslide case in Zigui County as an example,the paper selects three saturated permeability coefficients and calculates precipitation intensity of slide areas with relevant theories.Using finite element software,it stimulates the variations of seepage field under different rainfall intensities.It further calculates the stability coefficient of slope under 20-year-turn precipitation.Results suggest that under continuous strong rainfall,the smaller the permeability coefficient,the lower the stability of slope.The study can provide some scientific reference to treatment of landslide in Three Gorges area.

关 键 词：滑坡 降雨 渗透性系数 渗流 稳定系数 

分 类 号：TV697[水利工程—水利水电工程]