FLAC3D3.0在某隧道工程开挖支护中的应用 U7g,@/Qx Di])<V
隧道建模命令流入下： ieWXr4@: pLo;#e8'f
set log on (|<+yQ,@> X&,N}9>B
set logfile yang.log +eKLwM % &2B
gen zon radcyl p0 0 0 0 p1 9.0 0 0 p2 0 50 0 p3 0 0 8 & /F|VYl^_ >vxWx[fRu
size 4 20 6 4 dim 6 5 6 5 rat 1 1 1 1 group 围岩 L\bc R v?{vg?vI
gen zon cshell p0 0 0 0 p1 6.0 0 0 p2 0 50 0 p3 0 0 5.0 & 3KkJQ5a <G}m #
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>=} c}'Xoc
gen zon cshell p0 0 0 0 p1 5.6 0 0 p2 0 50 0 p3 0 0 4.6 & <1x u&Z7 7YD\ !2b
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 8x gc[#
gen zon radcyl p0 0 0 0 p1 0 0 -8.0 p2 0 50 0 p3 9.0 0 0 & **1=|aa: U,d2DAv t
size 4 20 6 4 dim 3 6 3 6 rat 1 1 1 1 group 围岩2 Y(T$k9%}+ oFn4%S:
gen zon cshell p0 0 0 0 p1 0 0 -3.0 p2 0 50 0 p3 6.0 0 0 & M A%g-} x{j+ }'9
size 4 20 6 4 dim 2.6 5.6 2.6 5.6 rat 1 1 1 1 group 仰拱初期支护 !g|[A7<| ~D_ rZ&
gen zon cshell p0 0 0 0 p1 0 0 -2.6 p2 0 50 0 p3 5.6 0 0 & |GPY bxzc ++gPv}:$X
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 iz(m3k:w
gen zone reflect normal -1 0 0 FS!vnl8` Z R 2\ dH*
gen zone radtun p0 0 0 0 p1 45 0 0 p2 0 50 0 p3 0 0 20 & N>sH T =_ %|bN@@
size 3 20 3 12 dim 9 8 9 8 rat 1 1 1 1.1 group 围岩3 D&],.N m&ZJqsZIL
gen zon reflect dip 0 ori 0 0 0 range x 0 9 y 0 50 z 8 20 3YUF\L]yyw 6 Ok,_
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gen zon reflect dip 0 ori 0 0 0 range x 9 45 y 0 50 z 0 20 _tQM<~Y]u\ R/ rcXX7%
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z 8 20 aHitPPlq CQ jV!d0j
gen zon reflect dip 90 dd 270 ori 0 0 0 range x 0 9 y 0 50 z -8 -20 .i#'IS0c #'KY`&Tw&
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 30BR 0C
gen zon brick p0 -45 0 -20 p1 -45 0 -40 p2 -45 50 -20 p3 45 0 -20 & WK{F T z2x9b\82
size 5 20 6 rat 1.1 1 1 group 围岩4 f&Juq8s_0 GJ>ypEWo
save tun_model.sav PT4iy< WS5"!vz
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 ( I!1sE!?1
; mohr-coulomb model sv6 m)pwh =x oBC&u
model mohr @)ls+}=Y 8nf4Jk8r
def derive @qB>qD~WsD 9<w=),R`8
s_mod1=E_mod1/(2.0*(1.0+p_ratio1)) I*n]8c !8Y3V/)NU
b_mod1=E_mod1/(3.0*(1.0-2.0*p_ratio1)) tY#Zl 54~{ `U!(cDY
s_mod2=E_mod2/(2.0*(1.0+p_ratio2)) E,Xl8rC (E I R z>
b_mod2=E_mod2/(3.0*(1.0-2.0*p_ratio2)) XQ8q)B= xpz`))w
end 3jHE,5m F *.
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set E_mod1=0.6e9 p_ratio1=0.27 E_mod2=0.8e9 p_ratio2=0.26 qI<c47d;q qs " s/$
derive #8y"1I=i& IY~
{)X
prop bulk b_mod1 shear s_mod1 cohe 1.8e6 tens 0.8e6 fric 30 range z 4.5 20 tqjjn5! vj(@.uU )
prop bulk b_mod2 shear s_mod2 cohe 2.8e6 tens 1.0e6 fric 35 range z -40 4.5 e7plL^^` $Uy#/MX
ini dens=2300 D$E#:[ sgD@} ":m
set grav 0 0 -10 ]@}o"Td Iw*C*%}[Z
; boundary and initial conditions _nSEp >]L @21u I{
apply szz -1.4e6 range z 19.9 20.1 ubc k{\. 'l8eH$
fix z range z -40.1 -39.1 ?yu@eo V"BVvSNu
fix x range x -45.1 -44.9 b`f6(6 n }TTq6B
fix x range x 44.9 45.1 :z6? uiuTv)pwF
fix y range y 49.9 50.1 (!Xb8rV0_ |&(H^<+Xp
hist unbal r$Ik* R -$b?rt]h1g
hist gp xdis 6.0,0,0 5r d t o KlF5I
hist gp zdis 0,0,5 muKu@nshL Ho >p ^p
hist gp xdis 6.0,50,0 2 #cw_Ua TftOYY.hQ
hist gp zdis 0,50,5 K1- RJj\L Qdi rE 4W
plot hist 3 ZVit] 3hd i(z+a6^@|
solve ?9?o8! g\qX7nIH?
save tun_nature.sav X7gB.=\X iPz1 eUj
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 @ jigbeHRy
ini xdis=0 ydis=0 zdis=0 !~ j9Oc^ ' %:5axg?]
plot re y{XNB}E $Q#?`j
model null range group 原岩 M3dUGM z(jU|va{_1
model null range group 二次衬砌 5r;)P po 37~r m
model null range group 初期支护 =w:H9uj6F &'NQ)Dn
set large ZY;g)`E1 d Z-Ny_@&
hist unbal h,]lN'JG{ tRkrV]K
plot hist 3 R80|q#h,] EO"=\C,
solve ~u?rjkSFoh zK,~ 37)\
save tun_ext1.sav 472 'P X CV0.u |
如果在开挖后适时对隧道进行锚喷混凝土初期支护，该命令流如下： 37V$Qb_ (+@faP
restore tun_nature.sav Exat_ L'? O${r^6Hh
ini xdis=0 ydis=0 zdis=0 g](&H$g L q%[A*`^
plot re U/7jK40 PXR0 Yn
model null range group 初期支护 >PGsY[N 65uZ LsQ
model null range group 二次衬砌 V0gu0+u~R { . cB >L
model null range group 原岩 / ]nrxT P mC82"
step 100 (k%r_O 6 >*Sv0#
hist unbal 4&~*;an7 VBhE{4J
plot hist 3 rE\&FVx H]U "+52h
mo el range group 初期支护 `oE.$~' d {?)q
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 $=7 H1 w
prop bulk 10.9e9 shear 8.9e9 dens 2500 range group 初期支护 M/}i7oS] e5FCqNip'
set large QX9['B< D`8E-Bq
solve _%aT3C}k 2"zI R (
save tun_ext2.sav
