FLAC3D3.0在某隧道工程开挖支护中的应用 U7g,@/Qx ]:}7-;$V
隧道建模命令流入下: ieWXr4@: a-lF}P\
set log on (|<+yQ,@> |-TxX:O-
set logfile yang.log +eKLwM kDG?/j90D
gen zon radcyl p0 0 0 0 p1 9.0 0 0 p2 0 50 0 p3 0 0 8 & /F|VYl^_ |S]T,`7u
size 4 20 6 4 dim 6 5 6 5 rat 1 1 1 1 group 围岩 L\bc R p}e| E!
gen zon cshell p0 0 0 0 p1 6.0 0 0 p2 0 50 0 p3 0 0 5.0 & 3KkJQ5a Y?- "HK:
size 4 20 6 4 dim 5.6 4.6 5.6 4.6 rat 1 1 1 1 group 初期支护 =1)9>=} 1'H!S%fS
gen zon cshell p0 0 0 0 p1 5.6 0 0 p2 0 50 0 p3 0 0 4.6 & <1x u&Z7 uANpqT}!
size 4 20 6 4 dim 5.0 4.0 5.0 4.0 rat 1 1 1 1 group 二次衬砌 fill group 原岩 vJ 28A ]*D~>q"#\
gen zon radcyl p0 0 0 0 p1 0 0 -8.0 p2 0 50 0 p3 9.0 0 0 & **1=|aa: n5y0$S/D
size 4 20 6 4 dim 3 6 3 6 rat 1 1 1 1 group 围岩2 Y(T$k9%}+ 3G'cDemc
gen zon cshell p0 0 0 0 p1 0 0 -3.0 p2 0 50 0 p3 6.0 0 0 & M A%g-} y+
4#Iy
size 4 20 6 4 dim 2.6 5.6 2.6 5.6 rat 1 1 1 1 group 仰拱初期支护 !g|[A7<| oA8A
@,-L
gen zon cshell p0 0 0 0 p1 0 0 -2.6 p2 0 50 0 p3 5.6 0 0 & |GPY bxzc }:S}jo7
size 4 20 6 4 dim 2 5 2 5 rat 1 1 1 1 group 仰拱二次衬砌 fill group 仰拱原岩 ,#0#1k<Dm h!`KX2~
gen zone reflect normal -1 0 0 FS!vnl8` ;B!p4hu
gen zone radtun p0 0 0 0 p1 45 0 0 p2 0 50 0 p3 0 0 20 & N>sH T =_ Bkg./iP5x
size 3 20 3 12 dim 9 8 9 8 rat 1 1 1 1.1 group 围岩3 D&],.N %{jL+4veoL
gen zon reflect dip 0 ori 0 0 0 range x 0 9 y 0 50 z 8 20 3YUF\L]yyw -b)3+#f
gen zon reflect dip 0 ori 0 0 0 range x 9 45 y 0 50 z 0 20 _tQM<~Y]u\ Z>~7|vl
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z 8 20 aHitPPlq d .Q<!Au3
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z -8 -20 .i#'IS0c BKV:U\QZ
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 9 45 y 0 50 z -20 20 <Y;w I#C U ]7;K>.T
gen zon brick p0 -45 0 -20 p1 -45 0 -40 p2 -45 50 -20 p3 45 0 -20 & WK{F !AGoI7W}
size 5 20 6 rat 1.1 1 1 group 围岩4 f&Juq8s_0 Rm}G4Pq
save tun_model.sav PT4iy< ';m;K
(g
假设围岩岩体符合mohr-coulomb本构模型,给围岩赋参数命令流如下, lpbcpB [Wxf,rW i
; mohr-coulomb model sv6 m)pwh iO"ZtkeNr
model mohr @)ls+}=Y 3bT?4
def derive @qB>qD~WsD @O|`r(le
s_mod1=E_mod1/(2.0*(1.0+p_ratio1)) I*n]8c V`rxjv}!
b_mod1=E_mod1/(3.0*(1.0-2.0*p_ratio1)) tY#Zl 54~{ F_&H*kL L3
s_mod2=E_mod2/(2.0*(1.0+p_ratio2)) E,Xl8rC e?N3&ezp
b_mod2=E_mod2/(3.0*(1.0-2.0*p_ratio2)) XQ8q)B= )d>Dcne
end 3jHE,5m .hjN*4RY
set E_mod1=0.6e9 p_ratio1=0.27 E_mod2=0.8e9 p_ratio2=0.26 qI<c47d;q ,ZVhL* "
derive #8y"1I=i& K1w:JA6(
prop bulk b_mod1 shear s_mod1 cohe 1.8e6 tens 0.8e6 fric 30 range z 4.5 20 tqjjn5! >`<qa!9
prop bulk b_mod2 shear s_mod2 cohe 2.8e6 tens 1.0e6 fric 35 range z -40 4.5 e7plL^^` tYG6Gl
ini dens=2300 D$E#:[ o7^0Lo5Z?
set grav 0 0 -10 ]@}o"Td =
toU?:.
; boundary and initial conditions _nSEp >]L hcz!f
apply szz -1.4e6 range z 19.9 20.1 ubc k{\. Gr'|nR8
fix z range z -40.1 -39.1 ?yu@eo B%5"B} nG
fix x range x -45.1 -44.9 b`f6(6 ;M"[dy`dY
fix x range x 44.9 45.1 :z6? )2
b-3lz
fix y range y 49.9 50.1 (!Xb8rV0_ So=
B cX-
hist unbal r$Ik* R \}AJ)v*<
hist gp xdis 6.0,0,0 5r d t -XnOj2
hist gp zdis 0,0,5 muKu@nshL Lj/
hist gp xdis 6.0,50,0 2 #cw_Ua sq@c?!'
hist gp zdis 0,50,5 K1- RJj\L c<sq0('`
plot hist 3 ZVit] 3hd 8T8]g M
solve ?9?o8! `NNP}O2
save tun_nature.sav X7gB.=\X pb G5y7
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 $"#M:V @ n] t3d
ini xdis=0 ydis=0 zdis=0 !~ j9Oc^ )$K\:w>
plot re y{XNB}E 53?Ati\Y)
model null range group 原岩 M3dUGM iba8G]2
model null range group 二次衬砌 5r;)P po 4y!GFhMh
model null range group 初期支护 =w:H9uj6F rxj#
set large ZY;g)`E1 |pBvy1e4)
hist unbal h,]lN'JG{ P0RtS1A
plot hist 3 R80|q#h,] >DN^',FEm
solve ~u?rjkSFoh _UY=y^ c0>
save tun_ext1.sav 472 'P \odns
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$Qb_ 0<##8m@F8
restore tun_nature.sav Exat_ L'? 'Er\68
ini xdis=0 ydis=0 zdis=0 g](&H$g v5&W)F
plot re U/7jK40 KL*+gq0k
model null range group 初期支护 >PGsY[N ge1U1o
model null range group 二次衬砌 V0gu0+u~R ce*?crOV
model null range group 原岩 / ]nrxT s#(7D3Pr#
step 100 (k%r_O 6 PS0/Ok
hist unbal 4&~*;an7 %/BBl$~ji
plot hist 3 rE\&FVx WO6+r?0M2
mo el range group 初期支护 `oE.$~' 7I*rtc&Kb
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 N4b{^JkF
prop bulk 10.9e9 shear 8.9e9 dens 2500 range group 初期支护 M/}i7oS] umt`0m. :
set large QX9['B< ,(]k)ym/
solve _%aT3C}k "rVM23@
tq
save tun_ext2.sav