开挖梁支护问题
陈育民老师书中的一个列子，问题描述：分析范围尺寸6m*8m*8m，开挖部分尺寸2m*4m*5m，开挖时用梁支撑。问题处用红字描述，刚学flac，请大家指点啊，先谢了。new
gen zone bri size 6 8 8
mod mohr
prop bulk 1e8 shear 0.3e8 fric 35
prop coh 1e10 tens 1e10
set grav 0 0 -9.81
ini dens 1000
fix x ran x -0.1 0.1
fix x ran x 5.9 6.1
fix y ran y -0.1 0.1
fix y ran y 7.9 8.1
fix z ran z -.1 .1
hist n 5
hist unbal
set mech force 50
sol
save beam-brace0.sav
;
prop coh 1e3 tens 1e3
model null range x 2 4 y 2 6 z 5 10；为什么不是z 3 8，并且用3 8算不通
set large
ini xdis 0 ydis 0 zdis 0
sel beam beg=(2 4 8) end=(4 4 8) nseg=2
sel beam prop emod=2.0e11 nu=0.30
sel beam prop xcarea=6e-3 xciz=200e-6 xciy=200e-6 xcj=0.0
hist gp zdisp 4 4 8
solve
save beam-brace1.sav
;
plo create GravV
plo set plane dip 90 dd 0 ori 3 4 0
plo set rot 15 0 20
plo set center 2.5 4.2 4.0
plo set cap size 25
plo add con disp plane behind shade on
plo add sel beam force fx
;plo add sel eom. black black node=off shrinkfac=0.0
plo add axes
plo show 我也遇上了这个问题，顶一下，希望高手指点~先谢了！
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