半硬半软岩隧道塌方的力学特性及处理方法分析

JournalofEngineeringGeology工程地质学报1004-9665/2009/17(2)026305*喻军刘松玉童立元(210096),,,,,,,,;,,,,,,,,,,:U452.1+1:AMECHANICALCHARACTERISTICSANDTREATMENTMETHODOFCOLLAPSEOFTUNNELWITHHALF-HARDANDHALF-SOFTROCKSALONGITSTRANSVERSESECTIONYUJunLIUSongyuTONGLiyuan(InstituteofGeotechnicalEngineering,TransportationCollege,SoutheastUniversity,Nanjing210096)AbstractTheJiaolingtunnelinconstructionencounteredtwotypesofrocksalongitstransversesection.Halfofthetunnelsectionishard-rockwhiletheotherhalfissoftrock.Thehardrockisintactandhasa40MPacompressivestrength.Thesoftrockisweatheredandfracturedandhasacompressivestrength5MPa.Collapseatthesideofsoftrocktookplaceduringtheconstruction.Mechanicalcharacteristicsforthehardandsoftrocksandthecollapsereasonswereanalyzedattheportalofthelefttunnelline..Thencounterpartcollapsetreatmentswereemployed.Forexample,surfacewithgroutingreinforcementandtube-groutingframewereexplained.Strengthofthetreatedsoftrockwasalmostequaltothatofhardrock.Bearingloopwasmadeupoftreatedsoftrockandhardrock.Atlastthetreatedzonewasmonitored.Itwasjudgedfrommonitoringdatathatthezonewasstablequickly.So,thistreatmentmethodisreasonableandeffective.Thebearinglooptheorycanbeusedtothehalf-hardandhalf-softrocktransverse-sectiontunne.lNewideainthepaperisthesuspensiontheoryapplicabletoboltingandgrouting-tubetreatmentofsoftrocktunne.lThistheorycanimprovetheeffectivenessofboltreinforcingsoftrocktunne.lThisconclusioninthepaperisusefulfordesignandconstructionoftunnelinhalf-hardandhalf-softrock.KeywordsHardrock,Softrock,Rocktunne,lCollapse,Tubeframe,Grouting,Surfacewithgroutingreinforcemen,tJiaoling*:2008-01-22;:2008-05-05.:,.Emai:[e-mail]1,,,,,,,,,[1,2],,,2(),,K82+420~K83+951.2,1531.2m;K82+300~K83+955,1655m,,,,,3100m,100m24.0%,59.6%,30.9%,48.5%,,,,,,,,,,,,,,,,,,,,,,,,ZK83+840~+970,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,40MPa,,,,5MPa,,(1)1Fig.1ThecrackofthesurfaceoftheexitcollapsesectofJiaolingtunnel3200516ZK83+883.5,11m,8m,6m,ZK83+867~+882,ZK83+835~+847ZK83+847~+86720m,,8~12m,,,90m2,360m2,,,3,6TY28,[3]ZK83+867~+88215m,I16,,,ZK83+832~+84715m,264JournalofEngineeringGeology工程地质学报2009,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4[3]4.1,,:(1):,;,,(2):,,,;,,,;,,,;,,,4.2,:(1):4;;,;(2):,;,,,;,,,,,,55.1,,,,,,,,,0.80~1.2m,,1~2m,[4]5.2[5~8]1~2m,,,,,,:30~40cm;18~20m,8~10,,,,,,,,5.3[9]ZK83+850~+90050m,7~9m,,,60cm,,50cm,10cmC10,,,26517(2)喻军等:半硬半软岩隧道塌方的力学特性及处理方法分析,,107mm,0.8m,4.0MPa6,,22Fig.2ThedistributionofmonitoringpointsoftheexitslopeofJiaolingtunnel3,P3,80mm,,5,P7,40mm,5P2P11,,5,P10P14,77,40mm,,,,,,,,:;;7(1)[10],,(2),,,,3Fig.3ThecurvesofthedisplacementchangewithtimeattheexitslopeofJiaolingtunnel(3),,(4),(5),,,(6),,8(1),:,;266JournalofEngineeringGeology工程地质学报2009,,;,(2),,,(3),,,,,,[1].[J].,2005,(12):36~37.ZhangJian.Preventionandtreatmentofcollapsebehindfaceduringtunnelconstruction.RailwayBuilding,2005,(12):36~37.[2],,.[J].,2006,5(1):158~161.ChenQiunan,ZhangYongxing,LiuXinrong,eta.l.IN-situmonitoringandFEMsimulationanalysisofconsolidationforacollapsedhighwaytunne.lChineseJournalofRockMechanicsandEngineering,2006,5(1):158~161.[3].[R],2005.ChinaRailwayNo.13dGroup.MethodofcollapsecureintheleftlineoftheexitofJiaolingtunne,l2005.[4].[M].:,1995.PanChangsh.iNumericalmechanicsandnumericalmethod.Beijing:ChinaRailwayPublishingHouse,1995.[5],,.[J].,1999,119(S0):39~40.JiChuanzhong,ZhaiGaokang,ZhuWe.iApplicationoftubeframeintunnelconstructioninsoftwallrocks.JournalofJiaotonguniversityofXian,1999,119(S0):39~40.[6].[J].,2005,25(4):15~16.SunLingwe.iApllicationoftube-framemethodforcollapsetreatmentintunne.lChinesehighwayengineering,2005,25(4):15~16.[7].[J].,2006,25(2):3976~3981.MaTao.Treatmentmethodforcollapsetreatmentofshallow-buriedtunne.lChineseJournalofRockMechanicsandEngineering,2006,25(2):3976~3981.[8],,.[J].,2003,22(4):589~595.WangLizhong,HuYayuan,WangBail,ieta.l.Stabilityanalysisandmonitoringfortunnelinloosesoilduringconstruction.ChineseJournalofRockMechanicsandEngineering,2003,22(4):589~595.[9].[J].,1998,31(5):65~72.JiangGognliang.Limitanalysisofthestabilityofshallowtunnelsinsoftground.JournalofCivilEngineering,1998,31(5):65~72.[10].[M].:,2002.LiXiaohong.NATMandin-situmonitoringtechnologyoftunneling.Beijing:ChinaScienceandTechnologyPress,2002.26717(2)喻军等:半硬半软岩隧道塌方的力学特性及处理方法分析