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1、锦屏二级水电站深埋特大引水隧洞关键技术（英文）张春生周垂一刘宁中国电建集团华东勘测设计研究院有限公司摘要：锦屏二级水电站布置7条穿越锦屏山的隧洞群总长约120km,其屮4条引水隧洞单洞均长16.67km,开挖洞径12.4J4.6m,隧洞沿线一般埋深15002000m,最大埋深2525m,最高外水压力超过10MPa,具有洞线长、埋深大和洞径大等特点，是国内乃至世界上己建、在建总体规模最大、综合难度最高的地下洞室群工程。引水隧洞沿线水文地质条件复杂，地形条件特殊，在建设过程中遭遇高地应力岩爆、岩溶地下突涌水和承载结构等诸多难题挑战，围绕上述难题开展了大量的开创性研究工作，成功解决了深埋特
2、大水工隧洞关键技术问题，保证了隧洞的安全快速掘进和稳定运行，电站于2014年全部投产发电，工程处于安全稳定运行状态。关键词：锦屏二级水电站;引水隧洞;深埋；高地应力;特大隧洞;作者简介：ZHOUChuiyi,E-mai1:zhou_cy@ecidi.com.KeyTechnologiesforExtremely-LargeDeep-buriedHeadraceTunnel:ACaseStudyofJinpingIIHydropowerStationZHANGChunshengZHOUChuiyiLIUNingPowerChirmHuadongEngineeringCorporatio
3、nLimited;Abstract：SeventunnelsacrossJinpingMountainarearrangedforJinpingIIHydropowerStation,withatotallengthofabout120km.Amongthem,fourheadracetunnelshavealengthof16.67km,anexcavateddiameterof12.4-14.6m,andacoverdepthof1500-2000mingeneral.Themaximumcoverdcpthis2525m,andthemaximumexternalwaterpr
4、essureismorethan10MPa.Thetunnelsarefeaturedbygreatlength,greatdepthandlargediameter.Itisthelargestandmostdifficultamongtheundergroundtunnelgroupsbui11orunderconstructioninChinaandeventheworld.Withcomplexhydrogeologicalconditionsandspecialtopographicalconditionsalongthetunnels,manychallengingpro
5、blems,suchasrockburstunderhighinsitustresses,groundwaterinrushinkarststrataandfailureofloadingbearingstructure,wereencoimteredduringconstruction.Agreatamountofgroundbreakingstudieswerecarriedoutregardingtheseproblems.Thekeytechnicalproblemsduringconstruetionofextremclylargeanddeeptunnelsweresol
6、vedsuccessfully.Safeandrapidtunnelconstructionandstableoperationwereachieved.Thehydropowerstationstartedoperationin2014andhasbeeninasafeandstableoperationstate.Thesuccessfulconstruct!onofheadracetunnelsofJinpingIIHydropowerStationcanprovidesomeexperiencesandreferencefordeeptunnelprojectsinthewo
7、rld.Keyword：JinpingIIHydropowerStation;headracetunnel;deep-buriedturmel;highinsitustress;extremely-largeturmel;0IntroductionTunnelengineeringisanimportanttechnicalmeansfornationaleconomicdevelopment,andplaysasignificantroleincommu
