摘要
为了提高非饱和膨胀土边坡的稳定,采用了土工膜覆盖边坡表面的方法。基于非饱和渗流理论,采用有限元程序对用膜覆盖和不覆盖的边坡分别进行了降雨蒸发干湿循环条件下的数值分析。在计算结果基础上,采用极限平衡法分析了边坡的稳定性。结果表明,用膜覆盖后边坡能长期保持非饱和状态,土体吸力较高,其稳定安全系数明显高于无膜保护的边坡,用复合土工膜覆盖边坡有利于提高非饱和膨胀土边坡的稳定。
In order to improve the stability of unsaturated expansive soil slope,the method of covering the slope by geo-membrane is applied.Based on unsaturated seepage theory,a finite element program is used to analyze the wetting-drying cycles caused by rainfall and evaporation on slopes covered by geo-membrane and without geo-membrane.Numerical simulation results are used to analyze the slope stability by limit equilibrium method.It is shown that the slope covered by geo-membrane can maintain the unsaturated state for a long period.The matric suction and safety factor of slope covered by geo-membrane is obviously higher than that of without it.The method of covering the slope by geo-membrane is efficient to improve the stability of unsaturated expansive soil slope.
作者
吴珺华
袁俊平
卢廷浩
WU Jun-hua;YUAN Jun-ping;LU Ting-hao(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Geotechnical Research Institute,Hohai University,Nanjing 210098,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第S01期363-367,共5页
Rock and Soil Mechanics
基金
“十一·五”国家支撑计划课题“膨胀土地段渠道破坏机理及处理技术研究”(No.2006BAB04A10)。
关键词
非饱和土
基质吸力
土工膜
边坡稳定
unsaturated soil
matric suction
geo-membrane
slope stability
