基坑开挖塑性导致不收敛问题

bafenzhai

基坑开挖塑性导致不收敛问题：采用的是剑桥模型，移除地连墙所占土体时，约束了被移除土体的水平位移和竖向位移。接着是激活地连墙，就在激活地连墙的时候呢，塑性变形过大，不收敛。换成弹性模型没有问题的。
我用剑桥模型不收敛的时候有以下提示：
1.The slave surfaces, assembly__pickedsurf273 and assembly_soil-wall-left intersect each other and are paired with master surfaces that intersect each other as well，，，，
2.OVERCONSTRAINT CHECKS: THERE ARE 19267 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 7 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.
3.One or more *TIE dependent nodes have specified boundary conditions. The boundary conditions from these nodes will be transferred to the associated *TIE independent nodes.The *TIE dependent and independent nodes have been identified in node set WarnNodeOverconBoundTieMov.
4.For *tie pair (assembly_soil-wall-b-assembly_wall-bottom), adjustment was specified but no node was adjusted more than the adjustment distance = 2.22000e-16.
5.No pore fluid flow will occur across slave surface assembly__pickedsurf273 and master surface assembly__pickedsurf272.
6.Displacement increment for contact is too big.
7.There is zero VOL. FLUX everywhere in the model based on the default criterion. ，，，，
8.The plasticity/creep/connector friction algorithm did not converge at 1 points

bananaliuchao

no one except the last can definitely influence your convergence.
it seems that the failure of your job is caused by contact, not MCC.
pls check your contact configuration