砂土地區(qū)盾構(gòu)下穿鐵路股道變形影響分析

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中圖分類號：U455.43 文獻標(biāo)志碼：A 文章編號：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

隨著地鐵網(wǎng)絡(luò)的快速發(fā)展，新建地鐵穿越既有構(gòu)（建）筑物的情況常有發(fā)生，盾構(gòu)施工時下穿既有鐵路路基就是其中一種。（剩余8379字）