2023年*安徽省学术和技术带头人后备人选科研活动经费支持项目(2018H170)**通信作者L形地铁换乘车站超深基坑支护结构设计优化分析*金平1王涛1蔡海兵2**龚永旺1黄军1(1.中铁四局集团有限公司城市轨道交通工程分公司,230022,合肥;2.安徽理工大学土木建筑学院,232001,淮南∥第一作者,高级工程师)摘要以福州地铁洪塘路换乘车站L形超深基坑为工程背景,采用MidasGTS有限元软件模拟了超深基坑的开挖和支护过程,对换乘节点处围护结构的水平位移、内支撑轴力和地面沉降进行了综合分析。模拟结果表明,在换乘节点处,将原设计的7道内支撑优化为5道内支撑的支护方案切实可行。将数值模拟结果与工程应用过程中的现场实测数据进行了对比分析。结果表明:换乘车站超深基坑采用分区隔断+5道内支撑的支护方案是安全可行的,其地下连续墙的水平位移值、内支撑轴力值和地面位移值均满足规范要求。关键词地铁;换乘车站;超深基坑;支护结构中图分类号TU473.2DOI:10.16037/j.1007-869x.2023.01.012DesignOptimizationAnalysisofUltra-deepFoun-dationPitSupportingStructureforL-shapedMetroInterchangeStationJINPing,WANGTao,CAIHaibing,GONGYong-wang,HUANGJunAbstractTakingtheL-shapedultra-deepfoundationpitofHongtangRoadinterchangestationofFuzhouMetroastheen-gineeringbackground,theexcavationandsupportingprocessoftheultra-deepfoundationpitissimulatedbyMidasGTSfiniteelementsoftware,andthehorizontaldisplacement,internalsupportaxialforceandlandsubsidenceoftheenclosurestructureattheinterchangenodearecomprehensivelyanalyzed.Simulationresultsshowthatitisfeasibletooptimizetheoriginal7-laneinternalsupportto5-laneinternalsupportattheinterchangenode.Thenumericalsimulationresultsandthefieldmeasureddatafromtheengineeringapplicationprocessarecomparedandanalyzed.Researchresultsshowthatitissafeandfeasibletoadoptthesupportschemeofpartition+5-lanein-ternalsupportfortheultra-deepfoundationpitofinterchangestation,andthehorizontaldisplacementvalue,internalsupportaxialforcevalueandlandsubsidencevalueofthediaphragmwallallmeetthespecificationrequirements.Keywordsmetro;interchangestation;ultra-deepfoundationpit;supportingstructureFirst-author'saddressUrbanRailTr...