FLAC3D3.0在某隧道工程开挖支护中的应用 U7g,@/Qx &:C[
n q
隧道建模命令流入下: ieWXr4@: k~;~i)Eg
set log on (|<+yQ,@> Z}zka<y6K6
set logfile yang.log +eKLwM j/O9LygB
gen zon radcyl p0 0 0 0 p1 9.0 0 0 p2 0 50 0 p3 0 0 8 & /F|VYl^_ b"@-9ke5I
size 4 20 6 4 dim 6 5 6 5 rat 1 1 1 1 group 围岩 L\bc R E\Wd*,/v)
gen zon cshell p0 0 0 0 p1 6.0 0 0 p2 0 50 0 p3 0 0 5.0 & 3KkJQ5a ?!F<xi:
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>=} fWJOP sp*/
gen zon cshell p0 0 0 0 p1 5.6 0 0 p2 0 50 0 p3 0 0 4.6 & <1x u&Z7 K~]Xx~F
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
})!-
gen zon radcyl p0 0 0 0 p1 0 0 -8.0 p2 0 50 0 p3 9.0 0 0 & **1=|aa: 6(\-aH'Ol
size 4 20 6 4 dim 3 6 3 6 rat 1 1 1 1 group 围岩2 Y(T$k9%}+ T__@hfT
gen zon cshell p0 0 0 0 p1 0 0 -3.0 p2 0 50 0 p3 6.0 0 0 & M A%g-} qDg`4yX.}
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<| zI"&g]TV5
gen zon cshell p0 0 0 0 p1 0 0 -2.6 p2 0 50 0 p3 5.6 0 0 & |GPY bxzc O>f*D+A-
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 4]zn,g?&
gen zone reflect normal -1 0 0 FS!vnl8` G@e;ms1
gen zone radtun p0 0 0 0 p1 45 0 0 p2 0 50 0 p3 0 0 20 & N>sH T =_ Ts, U T L
size 3 20 3 12 dim 9 8 9 8 rat 1 1 1 1.1 group 围岩3 D&],.N XmO]^ `
gen zon reflect dip 0 ori 0 0 0 range x 0 9 y 0 50 z 8 20 3YUF\L]yyw 7^)yo#i4
gen zon reflect dip 0 ori 0 0 0 range x 9 45 y 0 50 z 0 20 _tQM<~Y]u\ )2Q0NbDn
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z 8 20 aHitPPlq CNj |vYj
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z -8 -20 .i#'IS0c LkafB2y
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 IY~I=}
gen zon brick p0 -45 0 -20 p1 -45 0 -40 p2 -45 50 -20 p3 45 0 -20 & WK{F p? +!*BZ
size 5 20 6 rat 1.1 1 1 group 围岩4 f&Juq8s_0 Ac*)z#H
save tun_model.sav PT4iy< VAheus
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 V[^AV"V
; mohr-coulomb model sv6 m)pwh = ?/6hB=7<
model mohr @)ls+}=Y <Qbqxw
def derive @qB>qD~WsD zB7^L^Y
s_mod1=E_mod1/(2.0*(1.0+p_ratio1)) I*n]8c kSJ;kz,_
b_mod1=E_mod1/(3.0*(1.0-2.0*p_ratio1)) tY#Zl 54~{ rWJRoGk/
s_mod2=E_mod2/(2.0*(1.0+p_ratio2)) E,Xl8rC oN83`Z
b_mod2=E_mod2/(3.0*(1.0-2.0*p_ratio2)) XQ8q)B= a{;+_J3S
end 3jHE,5m OvC@E]/+
set E_mod1=0.6e9 p_ratio1=0.27 E_mod2=0.8e9 p_ratio2=0.26 qI<c47d;q $rjm MSxi
derive #8y"1I=i& MjBI1|*
prop bulk b_mod1 shear s_mod1 cohe 1.8e6 tens 0.8e6 fric 30 range z 4.5 20 tqjjn5! d]_].D$
prop bulk b_mod2 shear s_mod2 cohe 2.8e6 tens 1.0e6 fric 35 range z -40 4.5 e7plL^^` nJgN2Z
ini dens=2300 D$E#:[ ^eV K.
set grav 0 0 -10 ]@}o"Td $^e_4]k
; boundary and initial conditions _nSEp >]L *c.w:DkfB
apply szz -1.4e6 range z 19.9 20.1 ubc k{\. BB/c5?V
fix z range z -40.1 -39.1 ?yu@eo qbD_
fix x range x -45.1 -44.9 b`f6(6 0aGauG[
fix x range x 44.9 45.1 :z6? ,rY}IwMw
fix y range y 49.9 50.1 (!Xb8rV0_ 55y}t%5
hist unbal r$Ik* R fP;I{AiN~
hist gp xdis 6.0,0,0 5r d t ykx13|iR
hist gp zdis 0,0,5 muKu@nshL Efd@\m:~>
hist gp xdis 6.0,50,0 2 #cw_Ua e=tM=i"
hist gp zdis 0,50,5 K1- RJj\L n68qxD-X
plot hist 3 ZVit] 3hd ls "Z4v(L6
solve ?9?o8! g p9;I*!
save tun_nature.sav X7gB.=\X A|mE3q=
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 $"#M:V @ 2:[<E2z
ini xdis=0 ydis=0 zdis=0 !~ j9Oc^ D+BflI~9mP
plot re y{XNB}E m,4'@jg0
model null range group 原岩 M3dUGM a[=B?Bd
model null range group 二次衬砌 5r;)P po 925T#%y
model null range group 初期支护 =w:H9uj6F O" [#g
set large ZY;g)`E1 /byF:iYI
hist unbal h,]lN'JG{ H]dN'c-
plot hist 3 R80|q#h,] A6;[r #C
solve ~u?rjkSFoh tuo'Uk)
save tun_ext1.sav 472 'P vXSpn71Jb
如果在开挖后适时对隧道进行锚喷混凝土初期支护,该命令流如下: 37V$Qb_ 2C_I3S~U
restore tun_nature.sav Exat_ L'? H!y-o'Z
ini xdis=0 ydis=0 zdis=0 g](&H$g JV;VR9-l
plot re U/7jK40 : T4ap_Ycq
model null range group 初期支护 >PGsY[N -|czhO)R
model null range group 二次衬砌 V0gu0+u~R >^f]Lgp
model null range group 原岩 / ]nrxT ~vZ1.y4
step 100 (k%r_O 6 b3=XWzK5
hist unbal 4&~*;an7 *z'Rl'j9[
plot hist 3 rE\&FVx C0>)WVCK
mo el range group 初期支护 `oE.$~' v`jFWq8I,
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 2Y}A9Veb
prop bulk 10.9e9 shear 8.9e9 dens 2500 range group 初期支护 M/}i7oS] VM3)L>x]/
set large QX9['B< Pj^Ccd'>=
solve _%aT3C}k )qWO}]F
save tun_ext2.sav