砂土地区盾构下穿铁路股道变形影响分析

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中图分类号：U455.43 文献标志码：A 文章编号：1005-8249（2025）02-0124-07

DOI：10.19860/j.cnki.issn1005-8249.2025.02.021

Abstract：Whentheshieldtunnelisconstructedundertherailway，itwillcausecertaindisturbancetothesoil，resultinginthe setlementoftherailwayroadbedandafectingthesafeoperationoftrains.Inordertoinvestigatethedeformationandselement lawofrailwaystrandinsandysoil stratumdoublelinetunel excavation，thispapertakesNanjing MetroLine11projectasan example，basedon Abaqus finiteelement software，establishes an integrated three-dimensional model oftunnel strand group， analysesthesetlementinfluencelawofthestrandroadbedintheprocesofconstruction，carresoutthesensitivityanalysisof theexcavationparametersandconductsacomparativeanalysis of thereinforcementscheme.Theresearchresultsshowthat：the maximum settlement of the roadbed of typical strand crossing is located in the centre of the two - lane tunnel，and the maximum settlement value is greater than the control value.The tunnel is reinforced with deep holes，and the maximum settement valueof theroadbed meets the control standardaftercalculation when theradial reinforcementrange isabout Palm surfacepressureandgrouting presurearethekeyfactorsaffectingthesetlementof theroadbed，andtheappropratepalm surface pressure and grouting pressure can effectively control the settlement and deformation of the roadbed. Key words： shield construction； underpassing railroad； roadbed setlement； numerical simulation

0 引言

随着地铁网络的快速发展，新建地铁穿越既有构（建）筑物的情况常有发生，盾构施工时下穿既有铁路路基就是其中一种。（剩余8379字）