偏压双连拱公路隧道围岩稳定性动态预测分析

X1,2,1,1,3(1.,400044;2.,411201;3.,410073):,,,,BP,BP,,BP,,BP,,:;BP;;;:TU451:A:1006-7329(2005)01-0062-05DynamicPredictionAnalysisofSurroundingRocksStabilityforNon-symmetricDouble-ArchHighwayTunnelCHENQiu-nan1,2,ZHANGYong-xing1,CHENJian-gong1,LEIXu-zhou3(1.CollegeofCivilEngineering,ChongqingUniversity,Chongqing400045,P.R.China;2.DepartmentofCivilEngineering,HunanU2niversityofScienceandTechnology,Xiangtan411201,HunanP.R.China;3.)Abstract:Duringtheconstructionofnon-symmetricdouble-archrockhighwaytunnel,thecomplicatedgeologicalconditionmayaffectthesafetyoftheconstructorandtheengineeringquality.Inthispaper,twotreatmentmethodsareputforward.Atfirst,thesitemonitoringofsurroundingrockdisplacementmustbecarriedout,then,BPneuralnetworkisappliedinpredictingthedisplacementofsurroundingrockbasedonthelearningsampleofmeasuredval2ue,sothestabilityofsurroundingrocksmaybeanalyzedandforecasted.DuringtheanalysisofBPneuralnetwork,theeffectsofjointandfractureofsurroundingrockondisplacementcanbecomprehensivelyconsidered,comparingthepredictedvaluesofdisplacementwiththosebyFEM.TheresultsshowthatnotonlythepredictederrorofBPneuralnetworkisrelativesmall,butthepredictedvaluesofsurroundingrockdisplacementareclosetomeasuredones.So,thepredictedvaluesofBPneuralnetworkarereliableandmayguidetheengineeringconstructioninsite.Keywords:tunnelengineering;BPneuralnetwork;dynamicprediction;non-symmetricdouble-archtunnel;stability,,,,,,,,,NATM,,,,,[1]27120052JournalofChongqingJianzhuUniversityVol.27N.1Feb.2005X:2004-10-08:(03C509):(1968-),,,,,11.1BPRumelhart,McCelland,1982PDP,,1985BP(Back-PropagationNetwork),[24],,,,,,,,,,[57],netj=6jiYi(1):Yii;jiijjYj=f(netj)(2):fj,BP,,,Sigmoid(),f(x)=11+e-(x-)(3)::,,[24]:1);2)x;3)y;4)ji,:E=126Ni=1(yk-yk)(4):ji=ji+ji=ji+qjqj(5):,qq,j,qj:j,qj=(yqj-yqj)fj(netqj)(6)j,qj=fj(netqj)6k(qkkj)(7),ji(n+1)=jyj+ji(n)(8):n+1n+1;,5),,2)1.2,,361,:,,,X:J(X)=62i=1iJi/Jio(9):J1=6ki=1(ui-u1i)2;J10=6ki=1(ui)2;J2=6ki=1(pi-p1i)2;J10=6ki=1(pi)2:X,ECui,u1i;pi,p1i;k,i,1XX3(9),limXX3J(X)(X)(10)(10)Simplex22.1BP1,,,150110m,,20,3758m,,;-,,(),,,,,,,,,,(1.21t/d),11/MPa/MPatanc/MPaE50105/MPa130.7110.811.61.426.04.730.2160.63.50.833.83.180.1820.20.281.32,,Z1Y1,3446272342.1.1BP,4d,,,45,BP(),92.1.2BP3Z14Y1,,,,34AB,BC,ACDF,EF,EDZ1Y1,,,14.85%2.2BP44812162024285261014abacbc5(ab),,,,2(,abacbc)(ab)BP,,BP,BP,BPFEM6561,:2Z1/mmBPabacbcabacbcabacbc4-4(4)2.0-3.0-2.04-8(8)14.2116.3610.03.02.04-12(12)25.468.265.0827.129.767.5622.04.06.04-16(16)29.1110.6313.4332.7413.2115.6821.04.08.04-20(20)31.0712.0817.7233.9814.8719.4320.07.013.04-24(24)33.3814.5321.3236.4317.1224.3123.011.018.04-28(28)36.7523.7625.4838.2725.8327.9230.016.023.05-2(32)38.9326.6429.1941.2228.2732.4632.019.026.05-6(36)40.3228.8232.1144.3431.2135.1434.021.029.05-10(40)41.0629.4533.6746.7133.7637.3635.025.030.05-14(44)41.3930.0734.2547.8534.8538.2535.025.030.05-18(48)41.6147.985-22(52)41.7448.115-26(56)41.8048.1931),(25),;2)BP,,,14.85%,BP,3)BP,,,,,,,:[1],.J.,2002,24(2):35-38.[2],,.J.,1998,17(4):30-35.[3],.MATLABM.:,2001.[4],.J.,2001,26(1):45-48[5]ZhangDecheng,GaoXiaowei,ZhengYinren.BackanalysismethodofelasoplasticBEMinstrainspaceA.Proc6thInt.ConfNumbericalMethodsinGeomechanicsC.INNSBRUCK,1988:233-244.[6],.M.:,1999.[7],,.J.,2004,26(1):129-132.6627