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野狼123151

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[求助] 模拟隧道开挖不收敛，求大神分析！！！感谢感谢感谢

计算结果如图： $\"模拟隧道开挖不收敛，求大神分析！！！感谢感谢感谢\"$
这不是第一步开挖，已经开挖4步了，采用的是D-P模型，我试了一下如果隧道全断面开挖则可以求解完，但是分步开挖就算不出来，求大神分析。
网格质量应该还可以： $\"模拟隧道开挖不收敛，求大神分析！！！感谢感谢感谢-1\"$
设置的荷载步长等如下：
nsubst,50
autots,on
pred,on
lnsrch,on
nlgeom,on
nropt,full
cnvtol,f,,0.02,2,0.5
cnvtol,u,,0.05,2,0.5
outres,all,last
无接触单元
出现的错误：
*** WARNING *** SUPPRESSED MESSAGE CP = 4861.849 TIME= 23:00:07
There are 200 small equation solver pivot terms.

*** ERROR ***    SUPPRESSED MESSAGE CP = 4863.378 TIME= 23:00:09
One or more elements have become highly distorted.  Excessive
distortion of elements is usually a symptom indicating the need for
corrective action elsewhere.  Try incrementing the load more slowly
(increase the number of substeps or decrease the time step size).  You
may need to improve your mesh to obtain elements with better aspect
ratios.  Also consider the behavior of materials, contact pairs,
and/or constraint equations.  If this message appears in the first
iteration of first substep, be sure to perform element shape checking.

*** WARNING *** SUPPRESSED MESSAGE CP = 4863.378 TIME= 23:00:09
The unconverged solution (identified as time 18 substep 999999) is
output for analysis debug purposes.  Results should not be used for
any other purpose.

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