文章编号:1007-2993(2023)04-0408-07Mindlin解在复合地层盾构隧道施工地表沉降计算中的应用陈俊生1,2徐承凯1高强1(1.华南理工大学土木与交通学院亚热带建筑科学国家重点实验室,广东广州510640;2.华南岩土工程研究院,广东广州510640)【摘要】在我国华南、东南及华北沿海地区隧道工程中,隧道围岩常为“上软下硬”的复合地层,即洞身上部是软弱的土层、下部为强度很高的硬岩地层,在该类地层中进行盾构施工引起的地面沉降问题目前还鲜见研究报道。针对此现状,延续采用Mindlin解求解地表沉降的思路,为了克服扩展Mindlin解面对非均匀地层时的局限性,引入层面状态向量,利用积分变换和矩阵推导解决了位移与应力在不同层面之间的传递问题,建立了适用于复合地层的扩展Mindlin解。对比了Mindlin解及扩展Mindlin解对复合地层中盾构隧道地表沉降问题的适应性,并与背景工程监测数据对比。推导过程表明,运用Mindlin解或扩展Mindlin解来求解地表沉降都面临困境,需要进行一定的简化。而工程监测数据则表明,采用Mindlin解计算结果偏大,可作为工程设计的参考;扩展Mindlin解计算地表沉降的方法有一定的准确性。【关键词】上软下硬地层;地表沉降;Mindlin解;扩展Mindlin解【中图分类号】TU433【文献标识码】Adoi:10.3969/j.issn.1007-2993.2023.04.006ApplicationofMindlinSolutioninCalculationofGroundSettlementinCompositeStratumShieldTunnelConstructionChenJunsheng1,2XuChengkai1GaoQiang1(1.StateKeyLaboratoryofSubtropicalBuildingScience,SchoolofCivilEngineeringandTransportation,SouthChinaUniversityofTechnology,,Guangzhou510640,Guangdong,China;2.SouthChinaInstituteofGeotechnicalEngineering,Guangzhou510640,Guangdong,China)【Abstract】InthecoastalareasofSouthChina,SoutheastChinaandNorthChina,itiscommonthattheupperpartofthetunnelbodyisasoftsoillayer,andthelowerpartisahardrockstratumwithhighstrength.Theproblemoflandsubsidencecausedbyshieldtunnelinghasnotbeenstudiedatpresent.Toaddressthissituation,theideaofusingMindlinsolutiontosolveforsurfacesubsidencewascontinued.InordertoovercomethelimitationsofextendedMindlinsolutionfornon-uniformstrata,thelayerstatevectorwasin-troduced,andtheintegraltransformationandmatrixderivationwereusedtosolvetherelationshipbetweendisplace...