考虑接触面侧摩阻力的地铁基坑抗承压水稳定性分级设计原则

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中图分类号：P641.2；TU46+3 文献标志码：A 文章编号：2095-1329（2025）02-0054-11

Abstract：Thisstudyresolves thediscrepanciesbetweenstabityanalysisresultsderived fromcurentdewateringdesignstandardsfor foundationpitsndactualcofd-wateriducedaentsByerentiatigbetwnlcaleakpointsatitefaceandoalpit riskcharacterstics，wesstematicallalyemergencysposeapabilisundervangstabiliteentsagaistfdate therebyestablishigafourtedesigframeworkfoconfiedwatercontrolinmetofoundationpits.ForTeIVciteria（aquiferbrial depth ≥25m and stabilitycoefficient >0.8 ），we investigate pit scale characteristics and propose a stabilitycriterion incorporating interface side friction resistance. Comparative analysis of historical metro excavation surge cases reveals prediction deviations of -33% and 42% （20 forconventionalpresurebalaneandsearstrengthmethods，respectively.Theproposedsimplifeddiscriminantreducesdeviatiot within 8% ，significantlyimprovingfailurepredictionaccuracy.Engineringvalidationunder15-daysustainedexcavationwithastability coefcientof086（ondewateringonions）emostratednosafetyicidnts，yieldngamodifedstabilitycocientof9.is confirmsthemethod'sefectivenessandreliabilityinconfined-waterstabilityanalysis.Iplementationofthisframeworkeduces constructionsgotidntbbiltdtalctsmoatigantftoa economic，nderomentaldmensionsesearchprovidsciticalteoeticalfoundtiosndthicalpardigmsforalogous geotechnical engineering applications.

Keywords：condwaterotrol;excavatiosurg;stabilityeietagaistofdwater;otactsuface;sidefrtioistae shear strength

软土地区深基坑建设过程中，承压水控制不当往往是导致基坑安全和环境安全事故的关键因素之一[I-I]。（剩余12975字）