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时间:2019-05-31
《地铁重叠隧道上覆地层变形的数值模拟》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第24卷第12期岩石力学与工程学报Vol.24No.122005年6月ChineseJournalofRockMechanicsandEngineeringJune,2005地铁重叠隧道上覆地层变形的数值模拟黄俊,张顶立(北京交通大学隧道及地下工程试验研究中心,北京100044)3D摘要:以在建的深圳地铁I期工程重叠隧道为例,采用FLAC非线性大变形程序对重叠隧道暗挖四步台阶法施工引起的地层三维变形规律进行了数值模拟研究。结合现场试验断面的实测数据对比分析,得到隧道开挖过程中开挖引起的地层变形和失水引起的地层变形量值,并区分一般地层和含水、含
2、砂地层的环境控制标准,明确了深圳一般软土地层地表沉降最大值为60mm,含水、含砂地层地表沉降最大值为120mm。同时指出,对沉降控制要求较高的地段,可采用造价较高的地表垂直旋喷等辅助施工措施减小地层变形,这已在实际工程中取得了成功。研究结果对深圳地铁后期建设和同类地层地铁施工环境控制有借鉴和参考价值,对浅埋暗挖法在富水软土地层中的推广应用提供部分理论依据。3D关键词:隧道工程;重叠隧道;地层变形;浅埋暗挖法;FLAC;数值模拟;中图分类号:TD824.2文献标识码:A文章编号:1000–6915(2005)12–2176–07NUMERICA
3、LSIMULATIONOFSTRATUMDEFORMATIONABOVEOVERLAPPINGMETROTUNNELHUANGJun,ZHANGDing-li(ResearchCenterofTunnelingandUndergroundEngineering,BeijingJiaotongUniversity,Beijing100044,China)3DAbstract:TakingtheoverlappingtunnelofShenzhenMetroPhaseIprojectforexample,theFLAC(fastLagrangia
4、nanalysisofcontinua)codeswasadoptedtomodelthestratum3Ddeformationregularitycausedbyfour-stepshallowtunnelconstructionmethod(STCM).Bycomparingwiththein-situmonitordataofthetestsection,thevalueofstratumdeformationcausedbytunnelexcavationorseepageofgroundwaterwasobtained,andth
5、eenvironmentcontrolstandardofgeneralstratumisdifferentiatedfromthatofaqueoussandstratum.Accordingtothestandard,themaximumvalueofgroundsettlementofgeneralsoftstratumofShenzhenMetrois60mmandthatofaqueoussandstratumis120mm.Forsomepositionwithhighstandardofgroundsettlementcontr
6、olrequirement,secondreinforcementmeasuresaretakentodecreasestratumdeformation,suchasgroundverticaljetgroutingreinforcementwhichcostsmorethanthegeneralreinforcementmeasures.ThetechniquehasbeenappliedsuccessfullyinShenzhenMetroPhaseIproject.Theresearchresultwillprovidereferen
7、ceforcontrollingtheconstructionenvironmentoftheconstructionofShenzhenMetroandtheprojectwiththesimilarstratum.Itwillalsooffertheoreticalreferencefortheapplicationofshallowtunnelconstructionmethod(STCM)toaqueoussoftsandstratum.Keywords:tunnelingengineering;overlappingtunnel;s
8、tratumdeformation;shallowtunnelconstruction3Dmethod(STCM);FLAC;numericalsimulation
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