第18卷第10期2023年10月中国科技论文CHINASCIENCEPAPERVol.18No.10Oct.2023矩形隧道支护压力不均对地层稳定影响分析俞淼1,刘维1,杨超2,严佳佳3(1.苏州大学轨道交通学院,江苏苏州215000;2.北京住总集团有限责任公司,北京100101;3.中国电建集团华东勘测设计研究院有限公司,杭州311122)摘要:针对矩形隧道施工中难以保持土仓压力,以及矩形隧道掘进机配置的多刀头和双螺旋输送机或三螺旋输送机造成的压力波动会增大隧道面不稳定风险的问题,考虑掘进面未被完全支护的情况,基于筒仓-楔形体模型,通过极限平衡法对地层稳定性进行分析,并引入强度折减法,得出了稳定性安全系数计算式。对土体抗剪强度、隧道埋深和无支护区域大小等因素进行参数分析,结果表明:土体强度参数和隧道几何参数对安全系数影响较大;当未支护比率大于0.75、土体有效内摩擦角小于20°时,安全系数小于1,易发生失稳破坏。最后通过苏州某矩形隧道工程案例,讨论本文解的适用性。关键词:矩形隧道;极限平衡;强度折减;地层稳定中图分类号:TU43;U455.47文献标志码:A文章编号:20952783(2023)10110508开放科学(资源服务)标识码(OSID):Effectsofnon-uniformsupportpressureonthestabilityofboxtunnelworkingfaceYUMiao1,LIUWei1,YANGChao2,YANJiajia3(1.SchoolofRailTransportation,SoochowUniversity,Suzhou,Jiangsu215000,China;2.BeijingUni.-ConstructionGroupCo.,Ltd.,Beijing100101,China;3.PowerchinaHuadongEngineeringCorporationLimited,Hangzhou311122,China)Abstract:Inboxtunneling,maintainingsupportpressureintheworkingchamberisachallenge.Moreover,thepressurefluctu-atesduetotheboxtunnelmachineconfigurationswithmultiplecutterheadsanddoubleortriblescrewconveyors.Asaresult,thefluctuationofsupportpressureenhancestheriskoftunnelfaceinstability.Inthispaper,atypicalsituationthatthegroundwasnotfullysupportedagainstbythepressureatthefacewasconsideredandthesilo-wedgemodelwasappliedtoinvestigatethegroundstability.Thestabilitywasanalyzedthroughlimitequilibriumanalysisandthestrengthreductionmethodwasintroducedtoderivethesolutionofsafetyfactorofthegroundstability.Theparametricanalysiswasperformedtoexploretheinfluencesoffactorssuchassoilshearstrength,coverdepthandunsupportedareaonthegroundstability.Theresultsindicatethatthestabil...
