关于复杂地下结构进行布尔减运算不通过的疑问

我再见一个大型地下人防仓库的模型，从CAD导入ANSYS中后进行减运算，以便得到中空的实体，但是在此过程中一直出现warning，Topological degeneracy detected for VSBV command.Try modifying geometry slightly or loosening the tolerance (BTOL command). if BTOL is relaxed,be sure to change the tolerance back to the default after operation.
调整容差后仍然通不过，
另外还会出现这样的Warning:
The following entities do not support booleans.
Use the SPLOT command to examine bad surfaces/areas
Format for SPLOT is SPLOT,NA1,NA2,NINC,MESHSIZE
Volume Shell Area Loop Line
1 7 19 1 116
- - 16 1 106
- 14 72 1 223
实在是没有办法纠正，请高手帮忙，现将两个db文件附在上面，感激涕零，静候佳音！