FLAC3D3.0在某隧道工程开挖支护中的应用 U7g,@/Qx eV*QUjS~
隧道建模命令流入下: ieWXr4@: -]0:FKW
set log on (|<+yQ,@> ]!AS%D`
set logfile yang.log +eKLwM 3`reXms*{
gen zon radcyl p0 0 0 0 p1 9.0 0 0 p2 0 50 0 p3 0 0 8 & /F|VYl^_ ,CyX*k8o
size 4 20 6 4 dim 6 5 6 5 rat 1 1 1 1 group 围岩 L\bc R r[!~~yu/o
gen zon cshell p0 0 0 0 p1 6.0 0 0 p2 0 50 0 p3 0 0 5.0 & 3KkJQ5a 68z#9}
size 4 20 6 4 dim 5.6 4.6 5.6 4.6 rat 1 1 1 1 group 初期支护 =1)9>=} U6/7EOW,
gen zon cshell p0 0 0 0 p1 5.6 0 0 p2 0 50 0 p3 0 0 4.6 & <1x u&Z7 Nx.9)MjI
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 vJ 28A Jt5V{9:('
gen zon radcyl p0 0 0 0 p1 0 0 -8.0 p2 0 50 0 p3 9.0 0 0 & **1=|aa: Nl YFS?5
size 4 20 6 4 dim 3 6 3 6 rat 1 1 1 1 group 围岩2 Y(T$k9%}+ J`5+Zngr
gen zon cshell p0 0 0 0 p1 0 0 -3.0 p2 0 50 0 p3 6.0 0 0 & M A%g-} *:H,-@
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 !g|[A7<| ura&9~
gen zon cshell p0 0 0 0 p1 0 0 -2.6 p2 0 50 0 p3 5.6 0 0 & |GPY bxzc m
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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 ,#0#1k<Dm $^fF}y6N
gen zone reflect normal -1 0 0 FS!vnl8` dnLjcHFj&
gen zone radtun p0 0 0 0 p1 45 0 0 p2 0 50 0 p3 0 0 20 & N>sH T =_ 1TQ?Fxj
size 3 20 3 12 dim 9 8 9 8 rat 1 1 1 1.1 group 围岩3 D&],.N Em&3g
gen zon reflect dip 0 ori 0 0 0 range x 0 9 y 0 50 z 8 20 3YUF\L]yyw Xq$-&~
gen zon reflect dip 0 ori 0 0 0 range x 9 45 y 0 50 z 0 20 _tQM<~Y]u\ 5Hu[*
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z 8 20 aHitPPlq uNn1qV
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z -8 -20 .i#'IS0c VkJ">0k
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 9 45 y 0 50 z -20 20 <Y;w I#C :o^ioX.J
gen zon brick p0 -45 0 -20 p1 -45 0 -40 p2 -45 50 -20 p3 45 0 -20 & WK{F 4nm.ea|
size 5 20 6 rat 1.1 1 1 group 围岩4 f&Juq8s_0 n0 l|7:Mk
save tun_model.sav PT4iy< i$] :Y`3h
假设围岩岩体符合mohr-coulomb本构模型,给围岩赋参数命令流如下, lpbcpB 4N,[Gs<7
; mohr-coulomb model sv6 m)pwh 7N 0Bj!
model mohr @)ls+}=Y 8~O#@hB~3
def derive @qB>qD~WsD Hes!uy
s_mod1=E_mod1/(2.0*(1.0+p_ratio1)) I*n]8c I]eeV+U8W
b_mod1=E_mod1/(3.0*(1.0-2.0*p_ratio1)) tY#Zl 54~{ fsjLD|?|:
s_mod2=E_mod2/(2.0*(1.0+p_ratio2)) E,Xl8rC x >a h,
b_mod2=E_mod2/(3.0*(1.0-2.0*p_ratio2)) XQ8q)B= i[KXkjr
end 3jHE,5m .F7?}8>Z
set E_mod1=0.6e9 p_ratio1=0.27 E_mod2=0.8e9 p_ratio2=0.26 qI<c47d;q Fl.?*KBz
derive #8y"1I=i& w0g@ <(
3
prop bulk b_mod1 shear s_mod1 cohe 1.8e6 tens 0.8e6 fric 30 range z 4.5 20 tqjjn5! %J1'>nI!q
prop bulk b_mod2 shear s_mod2 cohe 2.8e6 tens 1.0e6 fric 35 range z -40 4.5 e7plL^^` tlQ6>v'
ini dens=2300 D$E#:[ @LI;q
set grav 0 0 -10 ]@}o"Td W]eILCo
; boundary and initial conditions _nSEp >]L m[=SCH-;
apply szz -1.4e6 range z 19.9 20.1 ubc k{\. R7Qj<,
fix z range z -40.1 -39.1 ?yu@eo Q (f0S
fix x range x -45.1 -44.9 b`f6(6 ~}b0zL
fix x range x 44.9 45.1 :z6? Dh`&B
fix y range y 49.9 50.1 (!Xb8rV0_ :'bZ:J>f
hist unbal r$Ik* R fSbLkd 9
hist gp xdis 6.0,0,0 5r d t /}@F
q
hist gp zdis 0,0,5 muKu@nshL j:cu;6|
hist gp xdis 6.0,50,0 2 #cw_Ua [UXVL}tk
hist gp zdis 0,50,5 K1- RJj\L Oz%6y
ri
plot hist 3 ZVit] 3hd \L(jNN0_R
solve ?9?o8! ;t +p2i
save tun_nature.sav X7gB.=\X bWA_a]G
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 $"#M:V @ legWY)4D;
ini xdis=0 ydis=0 zdis=0 !~ j9Oc^ T@ESMPeU:X
plot re y{XNB}E b~&cYk'
model null range group 原岩 M3dUGM c-hc.i}!
model null range group 二次衬砌 5r;)P po .fzyA5@l
model null range group 初期支护 =w:H9uj6F "^z%|uXkf
set large ZY;g)`E1 5b"=m9{g
hist unbal h,]lN'JG{ 8)8~c@
plot hist 3 R80|q#h,] Mrk3r/
8w
solve ~u?rjkSFoh =Lkn
save tun_ext1.sav 472 'P FBl,Mky
如果在开挖后适时对隧道进行锚喷混凝土初期支护,该命令流如下: 37V$Qb_ MPUyu(-%{
restore tun_nature.sav Exat_ L'? W\Pd:t
ini xdis=0 ydis=0 zdis=0 g](&H$g ,mm97I
plot re U/7jK40 g5|&6+t.
model null range group 初期支护 >PGsY[N -E\G3/*51
model null range group 二次衬砌 V0gu0+u~R HVA:|Z19
model null range group 原岩 / ]nrxT y?UJ<QAi
step 100 (k%r_O 6 7=N%$]DKZ
hist unbal 4&~*;an7 TI3xt-/
plot hist 3 rE\&FVx YA@?L!F
mo el range group 初期支护 `oE.$~' fh`Y2s|:7R
prop bulk 1.33e9 shear 0.8e9 cohe 2.2e6 tens 1.2e6 fric 32 range z 4.5 7.0 x -7.0 7.0 Ge76/T%{Q :4zPYG o
prop bulk 10.9e9 shear 8.9e9 dens 2500 range group 初期支护 M/}i7oS] Mk#r_:[BS
set large QX9['B< /UunWZ u%
solve _%aT3C}k i{EQjZ
save tun_ext2.sav