列车动荷载作用下软土深基坑结构变形时空效应数值模拟

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关键词：软土深基坑；结构变形；列车动荷载作用；时空效应；数值模拟；深基坑结构中图分类号：TU753 文献标志码：A 文章编号：1005-8249（2026）02-0107-05DOI：10.19860/j.cnki.issn1005-8249.2026.02.017

Numerical Simulation of Spatiotemporal Effects of Deformation in Soft Soil Deep Foundation Pit Structures under Dynamic Loads of Trains Passing Through Tracks

HUANG Yingpen

（Guangxi Nonferrous Survey & Design Institute Co.， Ltd.， Nanning 53OO31， China）

Abstract：Researchandanalysis areconductedonthe structuraldeformationof soft soildepfoundationpit structuresunderthe actionof traindynamicloads.Basedonactual engineering projects，collectandsurveyrelevantdata，andconstructanumerical modelof soft soildepexcavation structureinFLAC3Dsoftware.Constructdiferentialequations fortraindynamicloadsand simulate the actionof train dynamic loadsinnumerical models basedon thed’Aembert principle，inorderto simulateand analyzethedeformationstateof softsoildeepfoundationpitstructures.Theresultsshowthatundertheactionof traindynamic loads，thedeformationofsoftsoildeepfoundationpitstructuresismainlydividedinto transitionalrelaxationstage，stable relaxationstage，andaceleratedrelaxationstage.Indiferentstages，thesoftsoildeepfoundationpitstructuresexhibit diferentdeformationstates withdiferentlaws.Inthepracticalengineeringapplicationofsoftsoildeepexcavationstructures， maintenanceofthedeepexcavationresultsshouldbecariedoutbeforeacceleratingtherelaxationstage toensureitssafety.This research enablesthe designofmorerational construction parameterschemes fordeepexcavationsinsoftsoilin practical engineering projects.Itprovidesareferencebasisforsimilardeepexcavationconstructionanddesigninsoftsoil，fering theoretical and technical support forthe construction and safety management of deep excavations in soft soil.

Key words：soft soil deep foundation pit；structuraldeformation；train dynamic load efect；space-timeefect；numerical simulation； deep foundation pit structure

0 引言

在地铁工程等建设中，深基坑开挖是控制施工区土体位移与沉降、降低对周边道路及地下管线的关键环节[1]。（剩余5040字）