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1、第38卷,第4期公路工程Vo1.38,No.42013年8月HighwayEngineeringAug.,2013淺埋偏壓小凈距隧道洞口段施工異常分析及處治黃欣(湖南省交通規(guī)劃勘察設(shè)計院,湖南長沙410008)[摘要】以湖南省汝城至郴州高速公路上的黃毛嶺隧道工程為依托,結(jié)合現(xiàn)場監(jiān)測和數(shù)值計算,對淺埋偏壓小凈距隧道洞口段施工異常及其處治對策進行了研究。分析了隧道洞口施工異常段各監(jiān)測指標(biāo)的變化趨勢,并對其變形和開裂原因進行了綜合分析。基于有限元理論,建立了淺埋偏壓小凈距隧道洞口段施工數(shù)值模型,比較分析了
2、3種不同施工方法所呈現(xiàn)的力學(xué)特性,指出采用CD法施工可有效控制圍巖變形,保證后續(xù)施工安全。最后,結(jié)合上述研究結(jié)果,提出了一系列的有針對性的淺埋偏壓小凈距隧道洞口段施工異常處治對策,實踐證明其是可靠的。可為日后類似工程的設(shè)計、施工提供重要參考。[關(guān)鍵詞]隧道工程;淺埋;偏壓;洞口段;施工異常;處治對策[中圖分類號】U455.4[文獻標(biāo)識碼】A[文章編號]1674—0610(2013)04—0147—06AnalyzingandHandlingoftheAbnormalConditiononPortal
3、SectionofShallowBuriBiasTunnelswithSmallSpanHUANGXin(HunanProvinceCommunicationsPlanning,Survey&DesignInstitute,Changsha,Hunan410008,China)[Abstract]TakingtheHuangmaolingtunnelonRucheng—ChenzhouexpresswayinHunanprovinceChinaasbackground,theanalyzingand
4、handlingoftheabnormalconditiononportalsectionofshallowburiedbiastunnelswithsmallspanwasstudiedbymeansofmonitoringin—situandnumericalsimulation.First,thevariationtrendofeachmonitoringindicatorsontheabnormalconditionsectionwerestudiedconcretely,andtheabn
5、ormaldeformationandcrackingreasonswereanalyzedcomprehensively.Andthen,onbasisoffiniteelementtheory,numerica1modelsofportalsectionofshallowburiedbiastunnelswithsmallspanwasestablished,andthemechanicalcharacteristicsof3kindsofconstructionmethodswascompar
6、isonanalyzed,theresultsindicatesthattheCDmethodisoptimal,whichcanbettercontrolthedeformationofsurroundingrock,andmakesurethesafetyconstructioninnextprocedure.Atlast,accordingtotheaforementionedachivements,aseriestreatmentmeasuresfordealingwiththeabnorm
7、alconditiononportalsectionofshallowburiedbiastunnelswithsmallspanwereadvancedandapplied,thepracticeprovedthatthesetreatmentmeasureswerereliable,whichcanbesignificantreferenceforsimi-larityengineeringinthefuture.[Keywords]tunnelengineering;shallowburied
8、;bias;portalsection;abnormalcondition;treat-mentmeastures因特殊地質(zhì)及地形條件、線路走向、線形要求和0引言工程造價等因素的限制,雙洞隧道左右線間距往往當(dāng)前我國基礎(chǔ)設(shè)施建設(shè)正處高速發(fā)展階段,據(jù)出現(xiàn)難以滿足規(guī)范要求的情況,于是,小凈距隧道結(jié)統(tǒng)計,截止2007年底,不包括香港、澳門特別行政區(qū)構(gòu)型式應(yīng)運而生。相對于常規(guī)的分離式雙洞隧道,和臺灣,全國共有公路隧道4673座,累計長度小凈距隧道一定程度上能很好地滿足特殊地質(zhì)及