坝体土体和防渗墙模量变化对防渗墙应力变形的敏感性分析  

Sensitivity Analysis of the Cutoff Wall Stress and Deformation of the Modulus Variation on the Dams and the Cutoff Walls

作　　者：马晓华[1,2] 梁国钱[1] 郑敏生[1] 徐长节[2] 牟儒[2] 

机构地区：[1]浙江省水利河口研究院浙江省水利防灾减灾重点实验室,杭州310020 [2]浙江大学软土与环境工程教育部重点实验室,杭州310027

出　　处：《中国农村水利水电》2011年第6期110-112,116,共4页China Rural Water and Hydropower

基　　金：浙江省重大科技专项资助项目(2008C13040-2);浙江省水利科技计划资助项目(RA0901)

摘　　要：结合某水库的除险加固工程,建立二维有限元模型对采用低弹模混凝土防渗墙的某土石坝进行了数值模拟。分析计算按加固过程中的施工进度模拟,同时利用adina中多孔介质材料属性,考虑了坝体中渗流作用对防渗墙应力变形的影响。接触面单元考虑到在防渗墙的实际施工中需要泥浆护壁,采用Goodman修正单元。为分析坝体土体和墙体材料的弹性模量对墙体应力和变形的影响,研究了正常水位下防渗墙的应力和变形随坝体土体和防渗墙弹性模量变化而变化的规律性。计算结果表明:当防渗墙的弹模小于5 000 MPa时,墙体应力随防渗墙弹性模量的变化不敏感,当防渗墙的弹模大于5 000 MPa时,墙体应力随防渗墙弹性模量的变化敏感;最大水平位移随着防渗墙模量的增大变化不大,对防渗墙模量的变化不敏感;防渗墙墙体应力和变形对坝体土体弹性模量的变化不敏感。In this paper,a 2-D finite element model is established,and the stress and deformation of the earth-rock dam cutoff wall using low elastic modulus concrete is calculated.In order to analyze the influence of the modulus variation of the dam and the cutoff wall on the stress and deformation of the earth-rock dam cutoff wall,we study the variation law of the stress and deformation of the earth-rock dam cutoff wall by the modulus variation of the dam and the cutoff wall.The effect of the seepage of dams on the stress and deformation of the earth-rock dam cutoff wall is considered.For the stress of the earth-rock dam cutoff wall,when the value of elastic modulus is less than 5 000 MPa,the stress of the cutoff wall is not sensitive to variations in the elastic modulus of the cutoff wall.When the value of elastic modulus is larger than 5 000 MPa,the stress of the cutoff wall is sensitive to variations in the elastic modulus of the cutoff wall.For the deformation of the earth-rock dam cutoff wall,the maximum horizontal displacement is not sensitive to variations in the elastic modulus of the cutoff wall.Meanwhile,the stress and deformation of the earth-rock dam cutoff wall is not sensitive to variations in the elastic modulus of the soil of dam.

关 键 词：土石坝 低弹模 防渗墙 

分 类 号：TV543[水利工程—水利水电工程]