浅埋大跨隧道穿越复杂建筑物安全风险分析及评估

262Vol.26Supp.2200712ChineseJournalofRockMechanicsandEngineeringDec.20072007070420070726(863)(2006AA11Z119)(1982)[e-mail](100044)6395U45A10006915(2007)2371809SAFETYRISKANALYSISANDASSESSMENTOFCOMPLEXBUILDINGSINSHALLOW-BURIEDLARGE-SPANTUNNELCONSTRUCTIONHOUYanjuanZHANGDingli(TunnelandUndergroundEngineeringResearchCenterofMinistryofEducationBeijingJiaotongUniversityBeijing100044China)AbstractIncreasingattentiontourbanenvironmentsafetyduetourbantunnelexcavationisfocusedinrecentyears.Thereforeitissignificanttominimizetheimpactoftunnelconstructiononexistingstructuresfacilitiesandespeciallysomebuildings.Comparedwithotherstructuresbuildingsaremoresensitivetoexternaleffectsbecauseofparticularityandcomplexityofstructureandtheirdeformationmechanismsaremorecomplicatedthustheaccidentconsequencesaremoreseriouscorrespondingly.The1st-stageXiamenAirdromeprojectpassesthroughalargenumberofbuildingswithshallow-buriedlarge-spantunnelincomplexgeologystratamakingthebuildingsprotectioncrucialtoassureenvironmentsafetyandsuccessfultunneling.Consequentlythemechanismandfactorsoftunneling-inducedinfluenceonbuildingsshouldbeanalyzedfirstandthenafterfoundationandstructuretypeheightandcurrentdamageconditionetc.areclassifiedthesafetyevaluationofallthe63buildingsisthenperformed.Fuzzy-syntheticevaluationmethodisintroducedinriskassessmentandratinghere.Ninekeyaffectingfactorsoftwogeneralkindsareselectedandthememberfunctionandweightofthesefactorsarealsodetermined.Itispredictedthatanticipatedsafetytargetofthesebuildingsofdifferentrisklevelscouldbeachievedwiththisspecificguidingmeaning.Keywordstunnelingengineeringshallow-buriedlarge-spanbuildingsriskfuzzy-syntheticevaluationmethod262.•3719•1()[1]10.532km(1000m)636322.1[2]()12.2[3]()[4]232.34•3720•2007(a)()(b)()(c)()1Fig.1Relativepositionbetweensmall-spacetunnelandexistingbuildinginXiamenAirdromerouteproject2Fig.2Differentfailuretypesofbuildingsduetogrounddeformation12060(2)(a)(b)3Fig.3Sketchofbuildinghorizontaldamage1Table1Destructiongradeandcharacteristicsofbuilding/m0.030.030.060.060.120.120.180.182Table2Failuregradesofmasonrystructures/(mm·m1)/(103·m1)/(mm·m1)14mm3.00.22.02415mm6.00.44.031630mm10.00.66.0510.00.66.020m30m50m(a)(b)(c)(d)(e)262.•3721•33.1689.686m685.204m415.37m(415.072m)274.316m(270.132m)2.44%560m927m24m3.2(1)34m1530m2m(2)(3)24m46337(1)()//3()443Table3Classificationoffoundationtypesandnumbers//12202914Table4Classificationofstructuresandnumbers()312930(2)4Fig.4PlanviewofsurfacebuildingsalongPunanshallow-buriedtunnel11812312412527124128382840424451524442355354558081858458575982138828072738887121108100200707174751347877•3722•20071310m461024m710()113030(30)63(3)555.1[5][6]5.2(1)55Table5Currentdamageconditionofbuilding0312930(2)(20m)50m466Table6Relativeplanepositionofbuildingsandtunnel26750m1950m112.44%1030m262.•3723•520m(3)IIVI77Table7StrataconditionunderbuildingfoundationIIIIIIVVVI140231511(4)5.3[79]5IIIIIIIVV9()()()()85.48(9)[10]8Table8Gradesofaffectingfactorsandevaluation//m13.510.023.03.510.015.032.53.015.020.042.02.520.030.052.030.09Table9Classificationofqualitativeaffectingfactors(A)(B)(C)(D)(E)///()()/VIVIIIIIIIIIIVIIIIIIIV[1112]•3724•2007121122132233231(1)11πsin()222()11πsin()2220()xaaaxaxaaaxaaxaxaaaaxµ+⎛⎞−−⎜⎟−⎝⎠=+⎛⎞+−⎜⎟−⎝⎠⎧⎪⎪⎪⎪⎨⎪⎪⎪⎪⎩(1)()1(10)11π()sin(11)(1012)2220(12)xxxxxµΙ⎧⎪⎪=−−⎨⎪⎪⎩(2)0(10)11sin(11)(1012)222()11sin(15)(1218)2260(18)xxxxxxxµΙΙ⎧⎪π⎪+−⎪⎪=⎨π⎪−−⎪⎪⎪⎩(3)0(12)11πsin(15)(1218)226()11πsin(21.5)(1825)2270(25)xxxxxxxµΙΙΙ⎧⎪⎪+−⎪⎪=⎨⎪−−⎪⎪⎪⎩(4)ΙV0(18)11πsin(21.5)(1825)227()11πsin(27.5)(2530)2250(30)xxxxxxxµ⎧⎪⎪+−⎪⎪=⎨⎪−−⎪⎪⎪⎩(5)V0(25)11π()sin(27.5)(2530)2251(30)xxxxxµ⎧⎪⎪=+−⎨⎪⎪⎩(6)5(0.9)(0.7)(0.5)(0.3)(0.1)I1(0.15)()2.510(0.150.25)0(0.25)xxxxxµ⎧⎪=−⎨⎪⎩(7)II0(0.15)101.5(0.150.25)()1(0.250.35)4.510(0.350.45)0(0.45)xxxxxxxxµ⎧⎪−⎪⎪=⎨⎪−⎪⎪⎩(8)III0(0.35)103.5(0.350.45)()1(0.450.55)6.510(0.550.65)0(0.65)xxxxxxxxµ⎧⎪−⎪⎪=⎨⎪−⎪⎪⎩(9)IV0(0.55)105.5(0.550.65)()1(0.650.75)8.510(0.750.85)0(0.85)xxxxxxxxµ⎧⎪−⎪⎪=⎨⎪−⎪⎪⎩(10)V0(0.75)()107.5(0.750.85)1(0.85)xxxxxµ⎧⎪=−⎨⎪⎩(11)12{}nααα=AiαUiiU0iα11=∑iα1010Table10Weightvaluesofaffectingfactors10.15020.16530.1254/(L/H)0.06050.22560.10070.01080.12590.040262.•3725•5.5825[1318]}{21uu=U(12)1u42u5}VV{}{54321ΙΙΙΙΙΙΙ==vvvvvV(13)}{~54321iiiiiirrrrr=R⎥⎥⎥⎦⎤⎢⎢⎢⎣⎡=95911511~µµµµ#%#R(14)ijµijRAB~~~D=V}{~521bbb=BV5.6194#200#34#316199455.8m17.2m()15mCRD⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎦⎤⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎣⎡=0.00.00.00.10.00.00.00.050500.00.050500.00.00.00.00.00.10.00.00.00.00.10.00.00.00.00.10.00.00.00.10.00.00.00.00.00.10.00.050500.0~......R(15)}00285.0286.0429.0{~=B34#63111011Table11SafetyriskratingofbuildingsI10II19III10IV12V126(1)(2)(3)•3726•2007(References)[1].[J].20062(1)1320.(HUANGHongwei.State-of-the-artoftheresearchonriskmanagementinconstructionoftunnelandundergroundworks[J].ChineseJournalofUndergroundSpaceandEngineering20062(1)1320.(inChinese))[2].[][D].2003.(WUBo.Studyongroundsubsidenceinducedbyurbansubwaytunnelingoncomplicatedconditions[Ph.D.Thesis][D].ChengduSouthwestJiaotongUniversity2003.(inChinese))[3].[M].3.2003.(GUXiaoluQIANJinhongLIUHuishanetal.Groundsoilandfo