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1、隧洞破碎带围岩失稳破坏模式及控制措施研究邵帅1，杨兴国1，黄成2，黄康鑫3，周家文1*(1.四川大学水力学与山区河流开发保护国家重点实验室，四川成都610065；2.中国水利水电第七工程局有限公司，四川成都610081；3.四川大学水利水电学院，四川成都610065)摘要：为了解决在隧洞开挖过程中遇到节理带、断层等软弱破碎岩带时，发生大变形、塌方等围岩失稳破坏等问题，需提前或及时做好围岩支护措施，以确保洞室围岩的稳定及施工安全。本文以长河坝水电站泄洪洞工程为研究对象，通过对现场勘测资料、隧洞开挖施工方案及工程地质条件等的综合分
2、析，确定了软弱破碎带围岩稳定的主要影响因素，提出了隧洞破碎带围岩的典型失稳破坏模式。针对隧洞破碎带处围岩的潜在失稳问题，综合采用超前支护、开挖后及时进行喷锚+钢支撑+锚筋束联合支护，并通过有限元手段对隧洞围岩支护方案的加固效果进行了分析。有限元计算结果表明，隧洞破碎带处经及时加强支护后，围岩变形得到有效地控制，避免了洞室围岩失稳破坏现象的发生；现场监测数据及实施效果也表明及时加强支护措施对围岩稳定控制的有效性。关键词：隧洞工程；软弱破碎带；破坏模式；围岩稳定性控制；数值模拟中图分类号：TV65文献标识码：AFailuremod
3、esanalysisandcontrolmeasuresforsurroundingrockmassinfracturezoneoftunnelSHAOShuai1,YANGXing-guo1,HUANGCheng2,HUANGKang-xin3,ZHOUJia-wen1*(1.StateKeyLaboratoryofHydraulicsandMountainRiverEngineering,SichuanUniversity,Chengdu610065,China;2.Sinohydrobureau7CO.LTD,Cheng
4、du610081,China;3.CollegeofWaterResourceandHydropower,SichuanUniversity,Chengdu610065,China)Abstract:Tosolvetheproblemthatthefailuresofsurroundingrockmasses(suchaslargedeformationandcollapse)willbeeasilyhappenedwhenencounterofdevelopedjointfissures,faultorotherweakfr
5、acturedzoneduringthetunnelexcavationprocess,supportingmeasuresinadvanceortimelyarerequiredtoensurethestabilityofsurroundingrockandthesafetyofconstruction.FlooddischargetunnelattheChanghebaHydropowerStationwasselectedasacasestudyexample,aftercomprehensiveanalysesoffi
6、eldinvestigationresults,tunneldesignedschemesandengineeringgeologicalconditions,themainfactorseffectonthefailuresofsurroundingrockweredetermined,andthenthetypicalfailuremodesofsurroundingrockwereproposed.Forthepotentialinstabilityproblemsinfracturezoneoftunnel,advan
7、cesupportingmeasuresandsprayanchoring,steelsupporting,anchorwirebundlecombinedsupportingmeasureswereapplied,andreinforcementeffectofsupportingmeasuresforrockmasswasanalyzed.Theresultsshowedthatdeformationofsurroundingrockwascontrolledeffectivelyafterbeingsupportingt
8、imely,whichpreventedsurroundingrockfromfailure,moreover,thefieldmonitoringdataandapplicationeffectsprovedtheeffectivenessofreinforcingsupp
