用灰色局势决策法优选高地应力下 大型地下洞室拱形

2412Vol.24No.1220056ChineseJournalofRockMechanicsandEngineeringJune20052004031920040420(1968)[e-mail]121(1.7100422.710065)3()3.33TU45A10006915(2005)12211905SELECTINGARCHSHAPEOFLARGECAVERNSUNDERHIGHIN-SITUSTRESSBYMETHODOFGRAYCONDITIONCRITERIONSHIGuang-bin12LINing1(1.Xi′anUniversityofTechnologyXi′an710048China2.NorthwestInvestigationDesignandResearchInstituteXi′an710065China)AbstractBasedonrockgeologicaldataofalargecavernunderhighin-situstresstheeffectsofthreearchshapessinglecenterarchandthree-centerarchandellipticalarchoflargecavernsunderhighin-situstressonstresseffectinrockmassofarchareanalyzedbytheelastoplasticfiniteelementTheresultsrevealthatthiseffectisveryobviousandsomestressconcentrationfactorreaches3.33whicheverarchshapesareadoptedstressintensityneighborhoodofarchseatisunavoidable.Grayconditioncriterionisdevelopedwithplasticregionandstressconcentrationfactorandeachgrayconditionvalueiscalculated.Accordingtograyconditionvaluebysyntheticallyjudgingnomatterwhatin-situstresssidepressurecoefficientistheellipticalarchisthebestwiththethree-centerarchthesecond.Keywordsrockmechanicshighin-situstresslargecavernarchshapeselectionfiniteelementmethodgrayconditioncriterion1[13]21202005200.200.25[47]0.300.35FINAL22.1()[8]k=0.51.01.53R=0.85hy94927.076.1661+=σ(1)yσ(MPa)h(m)2.20.33133(1)fBfR225.0221+=(2)(2))(225.0222rfBrBfR−−+=(3a)r=BRBfRf−−−225.0222(3b)1Fig.1Archshapes(3)b=2Ba=f(4)Bf322Fig.2Excavationsteps2.333(1)126536270(2)126336260(3)12629625833232412.•2121•3Fig.3Observationpointslocations3.192.5463.333.33([9])4k=0.5Fig.4Pressureratiovariationofsidepressurecoefficientk=0.55k=1.0Fig.5Pressureratiovariationwithsidepressurecoefficientk=1.00.5(5)4(15)6k=1.5Fig.6Pressureratiovariationwithsidepressurecoefficientk=1.51.0k=0.555(15)1.533.062.503.237979311114%44.121222005(a)(b)(c)7k=0.5Fig.7Archplasticregionwithsidepressurecoefficientk=0.5(a)(b)(c)8k=1.0Fig.8Archplasticregionwithsidepressurecoefficientk=1.0(a)(b)(c)9k=1.5Fig.9Archplasticregionwithsidepressurecoefficientk=1.51Table1Plasticregionatarchvautk0.51.141.101.001.01.071.121.001.51.071.041.00[911][12]ab1b2b312S={[ab1][ab2][ab3]}kijUkijrijrkijkijkijUUrmax=(5)kijkrrknnijij∑==1(6)kijkSrrknnnijij∑==1(7)2412.•2123•nS11=∑=knnS(7)4.22232Table2Effectestimationk0.50.45540.45290.43271.00.44810.46200.43411.50.46070.45580.44285(1)3403.33(2)k(3)3(4)(References)[1].[M].1989.(ZhouWeiYuan.Advancedrockmechanics[M].BeijingWaterResourcesandElectricPowerPress1989.(inChinese))[2].[M].1987.(GaoLei.MiningRockMechanics[M].BeijingChinaMachinePress1987.(inChinese))[3].[M].1960.(YuXuefu.AxisRatioTheory[M].BeijingChinaMetallurgicalIndustryPress1960.(inChinese))[4].()[M].2000.(YangZheng.HydropowerEngineeringinChina(HydraulicStructures)[M].BeijingChinaElectricPowerPress2000.(inChinese))[5].[J].2002(4)1720.(ZhangDachengYangJing.DesignproblemsolvingwaysofDachaoshanundergroundpowerplant[J].UndergroundEngineering2002(4)1720.(inChinese))[6].[J].1997(8)5153.(LiZhenggang.FailureresearchonErtanhydropowerundergroundplantrockmass[J].WaterPower1997(8)5153.(inChinese))[7].[J].199615(3)275281.(LuAizhong.Themethodforoptimumshapesoftunnelsandcavities[J].ChineseJournalofRockMechanicsandEngineering199615(3)275281.(inChinese))[8].[R].2003.(InstituteofCrustalStressinChinaSeismBureau.In-situstratastressmeasurementofhydropowerundergroundplantrockmass[R].BeijingChinaEarthquakeAdministration2003.(inChinese))[9].[J].199615(1)2631.(LeeChuofenWangKejun.Effectsofhighhorizontalin-situstressonrockengineering[J].ChineseJournalofRockMechanicsandEngineering199615(1)2631.(inChinese))[10].[J].199918(3)245249(ZhuWeishenZhangQiangyong.Brittleelasticfracturedamageconstitutivemodelofjointedrockmassanditsapplicationtoengineering[J].ChineseJournalofRockMechanicsandEngineering199918(3)245249.(inChinese))[11].[J].200019(3)261264.(ZhuWeiShenChengFeng.Constitutivemodelofenergydissipationanditsapplicationtostabilityanalysisofship-lockslopeinThreeGorgesproject[J].ChineseJournalofRockMechanicsandEngineering200019(3)261264.(inChinese))[12].[M].1985.(DengJulong.BasicMethodofGraySystem[M].WuhanHuazhongUniversityofScienceandTechnologyPress1985.(inChinese))2412Vol.24No.1220056ChineseJournalofRockMechanicsandEngineeringJune20052004031920040420(1968)[e-mail]