FLAC3D基础知识介绍说课讲解

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gen zon radcyl p0 0 0 0 p1 9.0 0 0 p2 0 50 0 p3 0 0 8 & size 4 20 6 4 dim 6 5 6 5 rat 1 1 1 1 group 围岩 gen zon cshell p0 0 0 0 p1 6.0 0 0 p2 0 50 0 p3 0 0 5.0 & size 4 20 6 4 dim 5.6 4.6 5.6 4.6 rat 1 1 1 1 group 初期支护

gen zon cshell p0 0 0 0 p1 5.6 0 0 p2 0 50 0 p3 0 0 4.6 & size 4 20 6 4 dim 5.0 4.0 5.0 4.0 rat 1 1 1 1 group 二次衬砌 fill group 原岩

gen zon radcyl p0 0 0 0 p1 0 0 -8.0 p2 0 50 0 p3 9.0 0 0 & size 4 20 6 4 dim 3 6 3 6 rat 1 1 1 1 group 围岩2

gen zon cshell p0 0 0 0 p1 0 0 -3.0 p2 0 50 0 p3 6.0 0 0 & size 4 20 6 4 dim 2.6 5.6 2.6 5.6 rat 1 1 1 1 group 仰拱初期支护

gen zon cshell p0 0 0 0 p1 0 0 -2.6 p2 0 50 0 p3 5.6 0 0 & size 4 20 6 4 dim 2 5 2 5 rat 1 1 1 1 group 仰拱二次衬砌 fill group 仰拱原岩

gen zone reflect normal -1 0 0

gen zone radtun p0 0 0 0 p1 45 0 0 p2 0 50 0 p3 0 0 20 & size 3 20 3 12 dim 9 8 9 8 rat 1 1 1 1.1 group 围岩3 gen zon reflect dip 0 ori 0 0 0 range x 0 9 y 0 50 z 8 20 gen zon reflect dip 0 ori 0 0 0 range x 9 45 y 0 50 z 0 20

gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z 8 20

gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z -8 -20

gen zon reflect dip 90 dd 270 ori 0 0 0 range x 9 45 y 0 50 z -20 20

gen zon brick p0 -45 0 -20 p1 -45 0 -40 p2 -45 50 -20 p3 45 0 -20 &

size 5 20 6 rat 1.1 1 1 group 围岩4 save tun_model.sav

;假设围岩岩体符合mohr-coulomb本构模型，给围岩赋参数命令流如下，

; mohr-coulomb model model mohr def derive

s_mod1=E_mod1/(2.0*(1.0+p_ratio1)) b_mod1=E_mod1/(3.0*(1.0-2.0*p_ratio1)) s_mod2=E_mod2/(2.0*(1.0+p_ratio2)) b_mod2=E_mod2/(3.0*(1.0-2.0*p_ratio2)) end

set E_mod1=0.6e9 p_ratio1=0.27 E_mod2=0.8e9 p_ratio2=0.26 derive

prop bulk b_mod1 shear s_mod1 cohe 1.8e6 tens 0.8e6 fric 30 range z 4.5 20

prop bulk b_mod2 shear s_mod2 cohe 2.8e6 tens 1.0e6 fric 35 range z -40 4.5 ini dens=2300 set grav 0 0 -10

; boundary and initial conditions apply szz -1.4e6 range z 19.9 20.1 fix z range z -40.1 -39.1 fix x range x -45.1 -44.9 fix x range x 44.9 45.1 fix y range y 49.9 50.1 hist unbal

hist gp xdis 6.0,0,0 hist gp zdis 0,0,5 hist gp xdis 6.0,50,0 hist gp zdis 0,50,5 plot hist 3 solve

save tun_nature.sav

;对后面计算而言，模型建立时岩体在开挖前认为位移已经终了，因此需要对位移进行“清零”，而应力可以保留。假设隧道先开挖上断

面，中间不设支护，直到进尺50m，那么此时位移和应力的分布情况可用如下命令流

ini xdis=0 ydis=0 zdis=0 plot re

model null range group 原岩 model null range group 二次衬砌 model null range group 初期支护 set large hist unbal plot hist 3 solve

save tun_ext1.sav

;如果在开挖后适时对隧道进行锚喷混凝土初期支护，该命令流如下：

restore tun_nature.sav ini xdis=0 ydis=0 zdis=0 plot re

model null range group 初期支护 model null range group 二次衬砌 model null range group 原岩 step 100 hist unbal

plot hist 3

mo el range group 初期支护