考虑起始水力坡降的软土一维非线性固结分析  

Analysis of one-dimensional nonlinear consolidation for soft soils with threshold gradient

作　　者：李传勋[1] 王坤[2] 

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《江苏大学学报（自然科学版）》2014年第6期732-737,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51109092);中国博士后基金资助面上项目(2013M530237);江苏大学高级人才启动基金资助项目(12JDG098)

摘　　要：建立了考虑起始水力坡降的软土非线性固结控制方程,利用有限差分法求取其数值解答,通过与达西定律下的解析解相对比验证了数值计算的可靠性.在此基础上,分析了不同参数对固结性状的影响,研究结果表明:起始水力坡降越大,渗流前锋至土层底面所需要的时间越长,超静孔隙水压力的消散速率越慢;cc/ck值越大,渗流前锋移动速率越慢,土层的固结速率也就越慢;渗流前锋的移动速率随着荷载的增大及土层厚度的减薄而加快;cc/ck=0.5时,土层固结速率随着荷载的增大、土层减薄而逐渐加快;cc/ck=1.5时,土层固结速率随着荷载的增大、土层减薄而逐渐减慢.With the considerations of threshold gradient and nonlinearity,the governing equation was established,and the numerical solutions was solved by finite difference method and verified by comparing with analytical solutions from Darcy＇s law.The influence of parameters on consolidation behavior was discussed.The results show that the time of seepage boundary moving to the bottom surface of soil layer is increased with the increasing of threshold gradient,while the dissipation rate of excess pore water pressure slows down.With the increasing of cc/ ckvalue,the moving rate of seepage boundary and the rate of consolidation both slow down.The moving rate of boundary speeds up with the increasing of the external loading or decreasing of soil layer thickness.The consolidation rate of soil layer speeds up with the increasing of external loading or with the decreasing of soil layer thickness for cc/ ckof 0.5.The consolidation rate of soil layer slows down with the increasing of external loading or with the decreasing of soil layer thickness for cc/ ckof 1.5.

关 键 词：软土 起始水力坡降 非线性 一维固结 有限差分法 

分 类 号：TU433[建筑科学—岩土工程]