止水帷幕环保效果的影响因素分析

基于Biot固结理论并采用COFIST有限元程序,探讨了止水帷幕插入深度和地基参数等因素对环境保护效果的影响.通过平面应变模型的数值仿真,结果表明:止水帷幕打设深度越大,则坑外地表最终沉降和最终水位降深就越小;止水帷幕对于减小水位降深的效果要优于减小坑外地表沉降的效果;地基渗透系数的大小不影响最终沉降,地基弹性模量的大小不影响最终水位降深等.为提高分析结果的准确性,工程应用中应当重视基坑周围土体渗流场边界条件的准确确定.

Study on Influencing factors of Environmental Protection for Water-proof Wall

Based on Biot's consolidation theory and the finite element analysis program of COFIST,the environmental protection effects of such influencing factors as embedded depth of waterproof wall and foundation properties are discussed in this paper.Through the case study of a plane strain model,the results of numerical simulation show that the deeper the embedded depth of waterproof wall,the smaller the magnitude of the ultimate ground settlement and the drawdown outside pit foundation the environmental protection effect of waterproof for drawdown is more remarkable than for ground settlement the magnitude of foundation seepage and elastic modulus has no influence on the ultimate settlement and the ultimate drawdown respectively,etc.The boundary condition of seepage field around foundation pit should be determined properly in order to improve the analysis precision for engineering applications.