双连拱公路隧道裂缝成因及防治措施

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1、第24卷第2期岩石力学与工程学报Vol.24No.22005年1月ChineseJournalofRockMechanicsandEngineeringJan.，2005双连拱公路隧道裂缝成因及防治措施1112王建秀，朱合华，唐益群，魏沅东(1.同济大学地下建筑与工程系，上海200092；2.中国建筑西南勘察设计研究院，上海201206)摘要：双连拱公路隧道施工工序复杂，会导致隧道围岩遭受多次扰动，不良地质条件以及不合理的施工工序都会导致衬砌裂缝的出现，裂缝的出现对隧道结构的整体受力以及隧道防水等都十分不利。以云南元磨高速公路三公箐隧道为

2、背景，结合隧道的裂缝监测工作，指出混凝土温度、不均匀沉降、偏压荷载、不合理的施工工序均是双连拱隧道裂缝的主要成因。对隧道结构影响较大的是不均匀沉降、偏压荷载和不合理施工工序诱发的裂缝。针对双连拱隧道施工中出现的裂缝，根据其不同成因，可分别采用严格混凝土配合比、加强振捣和养护、设置变形缝、地基补强、加强中隔墙中导洞的侧壁支撑、加固变形边坡、消除偏压、洞内注浆加固以及地表注浆加固等方法进行处理。关键词：隧道工程；双连拱公路隧道；衬砌裂缝；衬砌裂缝成因；裂缝防治措施中图分类号：U45文献标识码：A文章编号：1000–6915(2005)02–0

3、195–08CRACKINGINTWIN-ARCHIGHWAYTUNNELSANDITSPREVENTIONMEASURES1112WANGJian-xiu，ZHUHe-hua，TANGYi-qun，WEIYuan-dong(1.DepartmentofGeotechnicalEngineering，TongjiUniversity，Shanghai200092，China；2.ChinaSouthwestGeotechnicalInvestigationandBuildingDesignInstitute，Shanghai201206，

4、China)Abstract：Thecomplexconstructionprocedureoftwin-archighwaytunnelsoftenleadstorepeatedrockdisturbances.Unfavorablegeologicalconditionsandimproperworkingproceduresmayalsocausecrackingintunnellinings，thuscreatedifficultiesforgroundwaterinflowpreventionandstability.TheSa

5、ngongqingtunnelontheYuanjiang—MohehighwayinYunnanprovinceistakenasatypicalexampleandanalyzedforthemainfactorsofcrackingoftunnelliningbasedontheobservedmonitoringdata.Itisfoundthattheconcretetemperature，non-uniformsettlementofthetunnelfloor，unevenpressure，andimproperconstr

6、uctionsequence，arethemaincausesforthecracksoftwin-arctunnel.Amongthem，thenon-uniformsubsidenceofthetunnelfloor，theunevenpressure，andtheimproperconstructionsequence，arethemainfactorsinfluencingthestabilityofthetwin-arctunnels.Fortreatmentofcracksofthetwin-arctunnels，accord

7、ingtotheirdifferentcauses，differentmeasurescanbeadopted：(1)morestrictcontrolonthemixproportionofconcrete；(2)improvedquiveringandcureofconcrete；(3)usingartificiallyinstalleddeformationjointsinthelinings；(4)reinforcingthetunnelfloor；(5)improvedsupportofconnectionpassesinthe

8、separationpillar；(6)supportingthedeformingslopesoftunnelstoeliminateunevenpressures；(7)grouting(