在进行开挖和上支撑时出现以下的情况：
模型是弹塑性的，不加接触就ok，
开挖第一步，可以
开挖第二步，加支撑一，计算就出现以下问题，请帮忙解决一下，谢谢
> ENTRY LOAD_BLOCK
> ILUT (DROPTOL=1.0e-003 SHIFT=1.0e-005 SYM): DIM=35989 NNZ(MAT)=337226 NNZ(LU)=1705780
> DECOMPOSITION EXECUTED: DIM=35989 SD=1.98e-002 HD=1.00e+000
> ILUT (DROPTOL=1.0e-003 NONSYM): DIM=35989 NNZ(MAT)=638463 NNZ(LU)=3433276
> DECOMPOSITION EXECUTED: DIM=35989 SD=5.80e-012 HD=1.00e+000
> ILUT (DROPTOL=1.0e-004 NONSYM): DIM=35989 NNZ(MAT)=638463 NNZ(LU)=4157698
> DECOMPOSITION EXECUTED: DIM=35989 SD=5.80e-012 HD=1.00e+000
> ILUT (DROPTOL=1.0e-005 NONSYM): DIM=35989 NNZ(MAT)=638463 NNZ(LU)=4496212
> DECOMPOSITION EXECUTED: DIM=35989 SD=5.80e-012 HD=1.00e+000
> ILUT (DROPTOL=1.0e-006 NONSYM): DIM=35989 NNZ(MAT)=638463 NNZ(LU)=4616846
> DECOMPOSITION EXECUTED: DIM=35989 SD=5.80e-012 HD=1.00e+000
> THE ITERATIVE SOLVER WAS UNABLE TO CONVERGE DUE TO AN ILL CONDITIONED MATRIX.
> 不正常的执行中断！
