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1、第5卷第5期地下空間與工程學報Vo.l52009年10月ChineseJournalofUndergroundSpaceandEngineeringOct.2009*高壓富水巖溶隧道注漿機理及作用效果分析1121張成平,張頂立,葉英,駱建軍(1.北京交通大學隧道及地下工程教育部工程研究中心,北京100044;2.北京市市政工程研究院,北京100037)摘要:高壓富水巖溶隧道施工中存在很高的安全風險,常面臨涌突水防治、圍巖穩(wěn)定性控制和襯砌高水壓處理等技術難題,實施可靠的超前地質預報和有效的注漿是解決上述難題的關鍵?；诖┰礁邏焊凰畮r溶區(qū)的圓梁山隧道工程,采用綜合地
2、質預報技術準確探明了溶洞的形態(tài)及其充填物性質;通過理論分析揭示了巖溶隧道的注漿機理;利用數(shù)值模擬確定了合理的注漿參數(shù);通過復合注漿形成了可靠的注漿加固圈。監(jiān)測結果表明:注漿圈起到了加固圍巖、穩(wěn)定工作面、封堵地下水和降低襯砌外水壓力的綜合作用,隧道施工中工作面穩(wěn)定,圍巖變3-1-1形不大,堵水效果顯著,達到了5mmd的隧道限量排水控制標準,并實現(xiàn)了小排水量條件下有效降低襯砌外水壓力的目的。研究成果對高壓富水巖溶隧道建設具有借鑒意義。關鍵詞:巖溶隧道;高水壓;地質預報;注漿機理;注漿效果中圖分類號:U459.5文獻標識碼:A文章編號:1673-0836(2009)05-0996-0
3、7AnalysisofGroutingMechanismandItsEffectforKarstTunnelinginHighWaterPressureandWaterenrichedRegion1121ZHANGChengping,ZHANGDingli,YEYing,LUOJianjun(1.TunnelandUndergroundEngineeringResearchCenterofMinistryofEducation,BeijingJiaotongUniversity,Beijing100044,China;2.BeijingMunicipalEngineeringRe
4、searchInstitute,Beijing100037,China)Abstract:Karsttunnelswithhighwaterpressureandrichwaterhaveveryhighriskduringconstruction.Theyarecommonlyfacedwiththetechnicalproblemssuchaswaterburstprevention,surroundingrocksstabilitycontrolandtreatmentofhighwaterpressureonlining.Reliablegeologyforecastingand
5、effectivegroutingisthekeytosolvetheproblems.BasedontheprojectcaseofYuanliangshantunnellocatedathighwaterpressureandwaterrichregions,themethodsofexactlyforecastingthesite,shapeandfilingofkarstcaveswereintroduced;themechanismsofgroutingweresystemicallyanalyzed;andtheappropriategroutingparameterswe
6、redecidedaccordingtonumericalanalyasis.Bymultiplegroutingtheeffectivegroutingcirclewereformed.Themonitoringdatashowthatthegroutingcircleattainstheeffectsofreinforcingsurroundingrocks,stablizingtheworkingface,blockinggroundwaterandreducingwaterpressureontunnellining.Thesurroundingrockskeepstablea
7、ndtheirdeformationisverysmallduring3-1-1tunneling.Thedrainagecontrolstandardof5mmdisalsoachieved,andthewaterpressureontunnelliningisreducedremarkablywithlowdischarge.Theresearchresultcanprovidereferencesforsimilarkar
