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1、第28卷第3期巖土力學(xué)Vo1.28No.32007年3月RockandSoilMechanicsMar.2007文章編號(hào):1000-7598一(2007)03-0609-05地鐵隧道施工引起地層位移規(guī)律的探討韓煊‘,“,李寧’,JamieR.STANDING(1西安理工大學(xué)巖土工程研究所,西安710048;2.北京市勘察設(shè)計(jì)研究院,北京100038;3英國帝國理工學(xué)院,英國倫敦SW72AZ)摘要:目前對(duì)城市隧道開挖所引起的地表以下地層的位移規(guī)律的認(rèn)識(shí)還很不充分,長期以來只有定性地認(rèn)識(shí)。英國學(xué)者M(jìn)air等人(1993年)
2、根據(jù)在豁土中的有限實(shí)測資料,基于預(yù)測地表位移的Peck公式,考慮了沉降槽寬度隨深度變化,從而提出了地表以下的位移計(jì)算公式。他們的研究成果被廣泛引用,但是由于其僅適用于勃性土,且假定地表處沉降槽寬度參數(shù)為0.5,因此在應(yīng)用上受到很大的限制。在Mair公式的基礎(chǔ)上,著重討論了沉降槽寬度參數(shù)隨地層深度的變化趨勢,并提出了修正計(jì)算公式,不僅可以考慮地表沉降槽寬度參數(shù)與0.5相差較大的情況,還適用于砂類土地層,因此比Mair公式具有更廣泛的適用性。關(guān)鍵詞:隧道;地鐵;地層位移;變形預(yù)測;沉降槽;沉降槽寬度參數(shù)中圖分類號(hào):U451
3、文獻(xiàn)標(biāo)識(shí)碼:AStudyonsubsurfacegroundmovementcausedbyurbantunnelingHANXuanl'2,LINingl,JamieR.STANDINGS(1.GeotechnicalResearchInstitute,Xi'anUniversityofTechnology,Xi'an710048,China;2.BeijingGeotechnicalInstitute,Beijing100038,China;3.ImperialCollegeofScience,Technology
4、andMedicine,London,UK,SW72AZ)Abstract:Theresearchonsubsurfacegroundmovementhasagreatimportanceintermsoftheevaluationoftheriskstothesubsurfacestructuresandpipelinesinfluencedbytunneling.However,thisisatopicaboutwhichislittleknown.AccordingtotheresearchbyMairetal(
5、1993)whoanalyzedthesubsurfacedatafromvarioustunnelingprojectsandcentrifugetestsinclays,subsurfacesettlementprofilescouldalsobereasonablyapproximatedbytheformofaGaussiandistributioninthesamewayassurfacesettlementprofiles.Theirequationbasedonthisobservationiswidel
6、yused.However,afixedvalueforsurfacesettlementtrough-widthparametersKisusedforclayintheequation,whichcausesconsiderableerrorsfordifferentgeologicalconditions.Also,becauseofthedatatheyused,Mairequationisonlyapplicabletoclays.Basedonfielddataanalysis,anormalizedrat
7、io丫issuggestedinthispapertoaccountforthedifferentgeologicalconditions;andamodifiedMairequationisestablishedwhichisnotonlysuitableforthecasessurfacesettlementtroughwithdifferentwidthparameters,butalsocanbeusedforsands.Thusthismodifiedgeneralexpressioncanbeusedtop
8、redictthesubsurfacegroundmovementwithabroaderadaptabilitycomparedwiththeoriginalMairequation.Keywords:tunnel;subway;subsurfacegroundmovement;deformationprediction;set