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《盾構(gòu)動態(tài)掘進(jìn)中圍巖變形特性的數(shù)值實(shí)驗(yàn)研究.pdf》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004-9665/2015/23(6)107207DOI:10.13544/j.cnki.jeg.2015.06.006盾構(gòu)動態(tài)掘進(jìn)中圍巖變形特性的數(shù)值實(shí)驗(yàn)研究①②②②②商擁輝商麗方前程趙瑩(①中南大學(xué)土木工程學(xué)院長沙410075)(②黃淮學(xué)院建筑工程學(xué)院駐馬店463000)摘要為了解軟弱土層盾構(gòu)隧道圍巖的變形特性,結(jié)合某市地鐵盾構(gòu)下穿既有橋梁結(jié)構(gòu)工程實(shí)例,建立每個(gè)分析步下盾構(gòu)動態(tài)掘進(jìn)三維數(shù)值模型。模型建立在庫侖屈服準(zhǔn)則和孔隙水達(dá)西定律推導(dǎo)的固結(jié)有限元方程上,綜合考慮刀盤扭矩、推進(jìn)力、土倉壓力、橋基荷
2、載及孔隙水壓力等影響盾構(gòu)施工質(zhì)量的諸多因素,結(jié)合室內(nèi)三軸實(shí)驗(yàn)和現(xiàn)場實(shí)測數(shù)據(jù),對盾構(gòu)動態(tài)掘進(jìn)過程建模原理、模型合理性、圍巖變形特性及橋梁結(jié)構(gòu)安全等問題進(jìn)行研究。研究結(jié)果表明:盾構(gòu)掘進(jìn)對圍巖變形影響表現(xiàn)為接近、穿越和遠(yuǎn)離3個(gè)階段;盾構(gòu)接近斷面時(shí),受刀盤扭矩、推進(jìn)力和土倉壓力的影響,前方地表出現(xiàn)拱起;盾構(gòu)穿過、遠(yuǎn)離斷面后,圍巖發(fā)生沉降、向隧道內(nèi)和向前運(yùn)動趨勢,變形主要集中洞口上方,呈“槽”型;地表/橋基沉降計(jì)算和實(shí)測值吻合,圍巖變形能夠滿足盾構(gòu)隧道施工安全。關(guān)鍵詞盾構(gòu)動態(tài)掘進(jìn)圍巖變形模型中圖分類號:P642文獻(xiàn)標(biāo)識碼:ANUMERICALEXPERIMENTALRESEARCHO
3、FDEFORMATIONCHARACTERISTICSOFSURROUNDINGROCKDUETOSHIELDTUNNELING①②②②②SHANGYonghuiSHANGLiFANGQianchengZHAOYing(①SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075)(②InstituteofArchitectureandEngineering,HuanghuaiUniversity,Zhumadian463000)AbstractThispaperaimstounderstandthedef
4、ormationcharacteristicsofshieldtunnelwallrockinsoftsoil.Itbuildsathreedimensionalnumericalmodelofeverystepofanalyzingtunnelingshielddynamic.Themodeliscombinedwiththeengineeringexampleofonecitysubwayshieldtunnelundertheexistingbridgestructure.Themodelisbasedontheconsolidationfiniteelemente
5、quation,CoulombyieldcriterionandDarcyslawofporewater.Itconsidersmanyfactorsthataffectthequalityofshieldconstruction.Thefactorsincludecuttertorque,propulsion,soilpressure,bridgefoundationload,porewaterpressure.Themodeliscombinedwithtriaxialexperimentsandfielddata.Issuesindynamicprocessofsh
6、ieldtunnelingincludingtheprincipleofmodeling,themodelrationality,thedeformationcharacteristicsofwallrock,andthesafetyofbridgestructure,arestudiedinthemodel.Theresultsshowthefollows.Theprocessthatshieldtunnelingaffectsthedeformationofwallrockshouldbedividedintothreestages,approaching,passin
7、gthroughandleaving.Whentheshieldtunnelingapproachesthesection,thefront收稿日期:2014-09-26;收到修改稿日期:2015-04-13.基金項(xiàng)目:湖南省自然科學(xué)基金項(xiàng)目(11JJ3051),湖南省教育廳科研項(xiàng)目(13C308)資助.第一作者簡介:商擁輝(1985-),男,博士生,主要從事地下結(jié)構(gòu)、軌道交通及地質(zhì)災(zāi)害風(fēng)險(xiǎn)評估方面的研究.Email:mlpeter@163.com通訊作者簡介:方前程(1982-),男,博士,講師,主要從事土木工