广州地铁西村站近接高架桥桩基影响分区及应用研究王明年1，崔光耀1，喻波2(1.西南交通大学土木工程学院，四川成都610031；2.中国中铁二院工程集团有限责任公司，四川成都610031)摘要：广州地铁西村站为暗挖法施工的隧道群，近接9组高架桥桩基，其中隧道与桩基XJ33最小净距仅2.30m。为保证高架桥的使用安全性，采用有限差分法和最小二乘法原理，对近接高架桥桩基进行近接影响分区研究，并根据分区结果对桩基进行分类，确定各类桩基沉降集中区，并对其提出可靠的加固方案；同时建立西村站近接桩基监控量测管理等级。研究结果表明：西村站隧道洞室开挖对近接高架桥桩基的影响可分为4个区，相应地把近接桩基分为4类；A类桩的桩基沉降集中区为掌子面前2.0D(D为隧道洞径)及掌子面后3.0D区段，B类桩为掌子面前1.0D及掌子面后3.0D区段，C类桩为掌子面前0.5D及掌子面后2.0D区段；西村站范围内的9组桩基均为A类桩基，其中危险桩基为XJ25，XJ32，XJ34。通过现场应用，有效地控制了西村站隧道群开挖对近接高架桥桩基的影响，保证了施工安全，积累了成功经验，可为相似工程施工提供参考。关键词：隧道工程；桩基影响分区；桩基沉降集中区；监控量测管理等级：U45；TU47文献标识码：A：1000–6915(2009)07–0000–09RESEARCHONINFLUENTIALPARTITIONANDAPPLICATIONOFADJACENTVIADUCTPILEFOUNDATIONSINXICUNSTATIONOFGuangzhouMetroWANGMingnian1，CUIGuangyao1，YUBo2(1.SchoolofCivilEngineering，Southwest激aotongUniversity，Chengdu，Sichuan610031，China；2.ChinaRailwayNo.2EngineeringGroupCo.，Ltd.，Chengdu，Sichuan610031，China)Abstract：NinegroupsofviaductpilefoundationsarelocatedinthevicinityofXicunstationofGuangzhoumetrowhichisconstructedbysubsurfaceexcavationmethod.Theminimumcleardistanceis2.30mbetweenthetunnelofXicunstationandpilefoundationXJ33.Toensuretheusesafetyoftheviaduct，theleastsquaresprincipleandfinitedifferencemethodareusedtostudytheinfluentialpartitionofthepilefoundations.Theoutcomeoftheinfluentialpartitionisusedforclassificationofpilefoundations.Andtheconcentratedareasofpilefoundationsettlementofthevarioustypesofpilefoundationsaredetermined.Theseresultsareappliedtopresenttheprogramofreinforcementandthemanagementlevelofmonitoringandmeasurementofthevarioustypesofpilefoundations.TheresultsshowthattheinfluentialpartitionoftheviaductpilefoundationisdividedintofourregionsbecauseofthetunnelexcavationofXicunstation.Accordingly，thepilefoundationsaredividedintofourcategories.TheconcentratedareaofpilefoundationsettlementofpiletypeAis2.0D(Disthediameteroftunnel)sectionbeforetunnelfaceand3.0Dsectionaftertunnelface，1.0Dsectionbeforetunnelfaceand3.0D---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---sectionaftertunnelfaceforpiletypeB，and0.5Dsectionbeforetunnelfaceand2.0DsectionaftertunnelfaceforpiletypeC.NinegroupsofviaductpilefoundationsbelongtotypeAinthevicinityofXicunstation.XJ25，XJ32andXJ34arethedangerouspilefoundation.TheseresultscaneffectivelycontroltheimpactoftunnelconstructioninXicunstationofGuangzhoumetroontheviaductpilefoundation，ensuretheconstructionsafetyandobtainsuccessfulexperience.Thiswillprovidereferencestoothersimilarprojects.Keywords：tunnellingengineering；influentialpartitionofpilefoundation；concentratedareaofpilefoundationsettlement；managementlevelofmonitoringandmeasurement1西村站地质条件及近接桩基概况1.1地质条件西村站所处地段为河流冲积平原，地形较平坦，地面标高8.21～12.78m。地层走向呈NE向展布，倾向NW，倾角约为45°，为白垩系上统大塱山组黄花岗段地层。主要岩性为红褐色泥质粉砂岩和粉砂质泥岩，局部夹砾岩、含砾粉砂岩。第四系覆盖层主要为海...