考虑土体自重的不排水对称面有限元分析  

Finite element analysis of undrained symmetry plane with self-weight

作　　者：蔡烽[1] 何利军[2] 张青青[3] 徐美娟[1] 梅国雄[1] 

机构地区：[1]南京工业大学交通学院,江苏南京210009 [2]南昌航空大学土木建筑学院,江西南昌330063 [3]兰州商学院信息工程学院,甘肃兰州730020

出　　处：《浙江大学学报（工学版）》2013年第12期2132-2140,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50608038;51322807)

摘　　要：在Terzaghi一维固结理论的基础上,结合连续排水边界,推导了连续排水边界下考虑土体自重的一维固结不排水对称面的解析解答.基于ABAQUS有限元软件开发了考虑土体自重的连续排水边界子程序,将计算结果与所推导的解析解进行对比,验证了该计算方法及其边界子程序的正确性.通过分析土体在自重作用下不排水对称面的影响因素,并与未考虑土体自重下的情况进行了对比,得到了不排水对称面的变化规律.最后将该数值分析方法引入饱和软黏土中不同深度设置排水砂层进行比较,结果表明:考虑土体自重情况下在不排水对称面大部分时间移动的区间内设置排水砂层是较为合理的.Based on Terzaghi＇s one-dimensional consolidation theory,the analytical solution of one-dimensional consolidation of undrained symmetry plane under continuous drainage boundary with self-weight was given.The subroutine of continuous drainage boundary with self-weight was wrote based on the finite element analysis of ABAQUS.Compared with the analytical solution,the results of finite element analysis show that the computing method and the subroutine of continuous drainage boundary are correct.Compared with the condition without self-weight,The influence factors of undrained symmetry plane with self-weight were researched.At last,the consolidation rate of setting sand layer at different depths in saturated soft clay was analysed by the method of finite element analysis.The results show that most of the time it is more reasonable to set sand layer at the moving range of undrained symmetry plane.

关 键 词：连续排水边界 自重作用 一维固结 不排水对称面 有限元分析 

分 类 号：TU47[建筑科学—结构工程]