求助！求助！地下空区模拟问题！
本人模拟地下空区，不考虑初始开挖，仅仅考虑在岩体自重的条件下的地表沉降问题，应该是很简单了！但是发现随着模拟开挖深度的下降，地表沉陷越来越大，也就是地下200m深的空区对地表的沉降，还要大于地下20m深的空区。明显不合理阿！应该越深，地表沉降越小。贴上命令流 求助各位，谢谢！！！！！
!模型
!/INPUT,'B','txt','E:\',, 0
/prep7
et,1,plane42
keyopt,1,3,2
mp,ex,1,5.8e10
mp,ex,2,4e10
mp,prxy,1,0.28
mp,prxy,2,0.3
mp,mu,1,10
mp,mu,2,10
tb,dp,1
tbdata,1,2.3e7,44,10
mp,dens,1,2590
tb,dp,2
tbdata,2,1.5e7,42,10
mp,dens,2,2510
!~SATIN,B,sat,,SURFACES,0
k,1,0,0,
k,2,250.0000,0
k,3,250.0000,141.4356,
k,4,0,99.24247,
k,5,208.0229,115.4356,
k,6,208.0229,119.4356,
k,7,32.75067,99.43565,
k,8,32.75067,95.43565,
k,9,250.0000,161.4356,
k,10,217.5540,159.4356,
k,11,143.2485,159.4356,
k,12,136.3564,164.4356,
k,13,115.7900,159.4356,
k,14,73.31444,149.4356,
k,15,32.75067,149.4356,
k,16,23.26848,159.4356,
k,17,10.37447,169.4356,
k,18,0,171.4356,
a,1,2,3,4
a,5,6,7,8
a,3,9,10,11,12,13,14,15,16,17,18,4
ASBA,1,2
asel,s,,,3,3
aatt,1,,1
alls
asel,s,,,4,4
aatt,2,,1
alls
lesize,all,3
amesh,all
!加载求解
/solu
acel,,9.8
dl,1,4,all,
dl,4,4,ux,
dl,2,4,ux,
dl,19,3,ux,
dl,9,3,ux,
time,0
autots,0
nlgeom,on
lnsrch,auto
nsub,10,100,
outpr,all,all
outres,all,all
solve
finish
!后处理
/post1
set,last
plnsol,u,y
finish
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