A苍岭特长公路隧道岩爆预测和工程对策

2421Vol.24No.21200511ChineseJournalofRockMechanicsandEngineeringNov.20052005062620050728(ZS032B25021)(1962)[e-mail]122(1.6100312.310006)300500mU45A10006915(2005)21396507PREDICTIONANDCOUNTERMEASUREFORROCKBURSTINCANGLINGMOUNTAINHIGHWAYTUNNELWUDe-xing12YANGJian2(1.SchoolofCivilEngineeringSouthwestJiaotongUniversityChengdu610031China2.ZhejiangProvincalPlanDesignandResearchInstituteofCommunicationsHangZhou310006China)AbstractBasedontheengineeringgeologyandthemeasuredgeostresstheinitialstressfieldisobtainedbyinversion.ThenthecircumferentialstressafterexcavationiscalculatedbyFEM.Accordingtotheresultsandcombinedwithlaboratoryrocktestanddifferentjudgementcriteriaofrockbursttheconclusionisgotthatthelowmiddleclassofrockburstwilloccurinthesurveyanddesignplasesandsomecountermeasuresareproposed.Intheconstructionphaseforpredictionofrockburstwithmoreprecisionthegeneralrockburstconditionispredictedagaincombinedwiththerealsituationandtheresultshowsthatthelow-middleclassofrockburstdiminishescorrespondingly.Meanwhiletherockburst300500minfrontofthecuttingfaceispredictedbystagesaccordingtothemeasuredgeostressandtheLusencriterionisfoundtobeapplicable.KeywordstunnellingengineeringCanglingmountaintunnelrockburststressFEMcriteria1[1]•3966•20051018m456040m11.1m8.6m80km/h()7536m()7605m15141m2666m4a(J3C1)(J3C1)(πγ)V[2]1756m300756m22.1[35]()[1][6](1)1(1)(2)(4)CS1CS31Fig.1PlanandlongitudinalsectionofthegeologyinCanglingtunnel2421.•3967•1Table1Criteriaforrockburst(1)(2)Rb/σ1(3)(4)WETRb/σ1Rc/σ1σθ/Rc2.02.05.05.036314.514.55.55.52.52.50.20.20.30.30.550.55WETRbRcσ1σθ1σθσ2.2(0.70.8)Rc0.05RcspψstψWET[3]254[7]MTS815Teststar0.1mm/min70%ε/10421Fig.2Completestress-straincurvesofsampleNo.1ε/10432Fig.3Completestress-straincurvesofsampleNo.2ε/10443Fig.4Completestress-straincurvesofsampleNo.3ε/10454Fig.5Completestress-straincurvesofsampleNo.422ET2.2252Table2Predictionofrockburstbyenergycriterion/mWET120.52.26222.52.25120.42.22230.52.17σ/MPaσ/MPaσ/MPaσ/MPa•3968•20052.3CS1CS3[2]NWW[2](1)CS1K96+567m35.0m401.30m158.98mN62WN68WN76WN68W(SH)9.0218.57MPa(Sh)5.9511.92MPa(Sv)2.414.20MPa(2)CS2K100+380100m612.13m300.40mN58WN63WN70WN63W(SH)8.3218.78MPa(Sh)5.3212.78MPa(Sv)3.697.79MPa(3)CS3K102+20014.0m393.60m101.25mN38WN30WN72WN46W(SH)3.8615.05MPa(Sh)2.259.32MPa(Sv)0.702.63MPa3[3]2.41σθσRc180.8MPaRb169.0MPaRc160MPaRb150MPa[7]1σθσ121CS1CS3[89](xσyσ)(1σ3σθσ)[8]3(3)[7]34K98+060K100+055K95+430K98+060K100+055K10116333.13(1)[5](2)IIIIV[6]52421.•3969•3Table3PredictionofrockburstinCanglingtunnelRb/σ1Rb/MPaRc/MPaσ1/MPaσθ/MPaRb/σ1Rc/σ1σθ/RcK95+430K96+25015016028.016.95.355.710.11K96+250K96+43015016028.519.65.265.610.12K96+430K96+65015016035.319.94.254.530.12K96+650K97+03015016032.822.74.574.880.14K97+030K97+50015016035.727.64.204.480.17K97+500K98+06015016044.435.43.373.600.22K98+060K98+46015016053.243.42.823.010.27K98+460K99+68015016059.548.92.522.690.31K99+680K100+05515016051.642.02.913.100.26K100+055K100+44015016044.936.43.343.560.23K100+440K100+58515016041.333.53.633.870.21K100+585K100+79315016036.729.74.084.360.19K100+793K101+16315016031.525.34.765.080.16K101+163K101+80615016022.717.56.617.050.11K101+806K102+15015016019.712.17.618.120.084Table4Finalpredictionresultsofrockburst/mK95+430K96+0602630K98+060K100+0551995Rb/σ1K100+055K101+1631108K95+430K96+4301000K96+430K101+1634733K101+163K102+150987K97+500K98+460960K98+460K99+6801995K99+680K100+5859055Table5Designlengthsoftherockburst/mK96+740K98+0601320VK98+060K99+4001340VK99+670K100+055385VK100+055K100+160105VK96+610K98+0601450VK98+060K99+3981338VK99+668K100+055387VK100+055K100+158103V3.23.2.1[10](1)(2)(3)(4)3.2.2(1)4m3510min10m(2)φ50mm•3970•20053m1.5m@1.5m[10](3)φ6150mm150mm6cm(15cm)φ25mm52m50kN180kN[10].3.2.3(1)4m3050m5m(2)3510min10m(3)φ50mm3m1.5m1.5m[10](4)φ25mm2m50kN1m1m180kN[10](5)φ6150mm150mm100mm(20cm)[10]44.1[11](1)NATM(2)()(3)34.24.2.1200312282005518K97+415K97+360K100+292K100+394.+()4.2.2(6)6Table6Comparisonofthepredictionsectionindesignandconstructionphases/m/mK95+430K98+0602630K97+740K98+240550K98+060K100+0551995K98+240K99+5901350K100+055K101+1631108K99+590K100+2206306645m200500m[11](7)2421.•3971•7Table7Comparisonoftherockburstbymeasuredstressvaluein-situ/MPaσθ/σ1K97+210157.318.4/18.6K97+230157.327.0/27.4K100+400157.316.7/21.8K100+570157.322.0/23.97[11]300500m5(1)(2)(References)[1].[J].199910(1)2528.(FuWenxiRenGuangmingNieDexingetal.Discussiononthepredictionandcontrolofrockburstdeep-lyinglongtunnel[J].JournalofGeologicalHazardsEnvironmentPreservation199910(1)2528.(inChinese))[2].[R].2004.(ZhejiangProvincalPlanDesignandResearchInstituteofCommunications.ThereportofengineeringgeologyreconnaissanceinconstructiondetaildesignofCanglingtunnel[R].HangzhouZhejiangProvincalPlanDesignandResearchInstituteofCommunications2004.(inChinese))[3].[J].()200122(1)6063.(LiShulinFengXiatingWangYongjiaetal.Evaluationofrockburstprogressindeephardrockmine[J].JournalofNortheasternUniversity(NaturalScience)200122(1)6063(inChinese))[4].[J].199619(2)154156.(FanJianping.DiscussionontherockburstintheSipujiantunnelofShanxiProvince