| bafenzhai | 2013-08-01 08:55 |
求助基坑开挖中一个关键问题我们知道基坑开挖时都是先把地连墙所占土体移除，在激活地连墙，是吧，可是在我移除墙所占土体的时候，出现过大变形，特别是土体顶部有向墙体的位移，而且这个位移还很大，我觉的应该是这个问题才导致计算不收敛的，我发帖发了不下4贴，愣是没有人理会我，回复我，不知是不是我的帖子说明不详细还是什么原因，现在我把图片也附上，大家给看一下，第一分析步为geo地应力平衡。第二步为r-soil，总时间为1E-5移除墙占土体。  我用的是剑桥模型，参数取得已经很大了，愣是算不过去这一步，大家给点建议啊，有以下提示：1.For *tie pair (assembly_s-b-assembly_w-b), adjustment was specified but no node was adjusted more than the adjustment distance = 2.22000e-16. 2。A geostatic procedure with maximum displacement tolerances is supported only for the following materials: elastic, porous elastic, extended cam-clay plasticity model and mohr-coulomb plasticity model. In general, the use of other materials with this procedure may lead to poor convergence or no convergence of the analysis. 3.OVERCONSTRAINT CHECKS: THERE ARE 14416 BOUNDARY CONDITIONS SPECIFIED IN THIS MODEL. OVERCONSTRAINT CHECKS FOR BOUNDARY CONDITIONS SPECIFIED ON SLAVE NODES OF RIGID BODIES, OF *TIE OPTIONS, OR OF *COUPLING OPTIONS REQUIRE 5 Mb OF MEMORY. IF THIS IS A PROBLEM, PLEASE TURN OFF OVERCONSTRAINT CHECKS USING *CONSTRAINT CONTROLS, NO CHECKS or INCREASE THE MEMORY USED BY THE PRE-PROCESSOR 4.Initial conditions violate pore pressure relation at one or more integration points in 8460 elements. Initial saturation will be modified. The elements have been identified in element set WarnElemICPorePresStep1Inc1 5.The plasticity/creep/connector friction algorithm did not converge at 1 points 6.The plasticity/creep/connector friction algorithm did not converge at 12 point 7.The plasticity/creep/connector friction algorithm did not converge at 2 point 以上是我模型的情况，还请高手或者老手给予指导，我真的是发帖好几个了，也非常感谢大家的讨论和支持 |
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