第5卷第1期地基处理Vol.5No.12023年1月JournalofGroundImprovementJan.2023紧邻大直径盾构隧道的基坑开挖实测分析杨子凡1，陈韩鑫2，罗敏敏2*（1.中海兴业（西安）有限公司，陕西西安710061；2.浙江大学建筑设计研究院有限公司，浙江杭州310028）摘要：基于杭州某紧邻大直径盾构隧道的基坑工程，通过实测数据分析了基坑开挖过程中的变形性状规律。结果表明，基坑开挖过程中深层土体侧移曲线呈弓形分布，且侧移量的大小具有长边与空间效应，开挖影响程度沿远离基坑坑角的方向逐渐衰减；开挖工后周围地层流变和支撑应力松弛具有明显的时间效应，扰动影响不容忽视；周围地表沉降沿基坑向外和沿基坑长边方向均呈“凹槽”分布模式，且基坑长边中部距基坑1.0倍开挖深度范围的地表变形沉降最大；基坑开挖卸荷，导致坑底土体隆起变形，带动围护结构上移，建议尽量缩短基坑开挖过程中的暴露时间，尤其是深层土体，尽快架设支撑以及浇筑底板，可有效抑制隆起与侧向变形。关键词：基坑；隧道；变形性状；实测分析；时空效应；扰动中图分类号：TU94文献标识码：A文章编号：2096–7195(2023)01–0067–09Analysisofthemeasurementsofexcavationadjacenttolarge-diametershieldtunnelYANGZi-fan1,CHENHan-xin2,LUOMin-min2*（1.ZhonghaiXingye(Xi’an)Co.,Ltd.,Xi’an710061,Shaanxi,China;2.TheArchitecturalDesignandResearchInstituteofZhejiangUniversityCo.,Ltd.,Hangzhou310028,Zhejiang,China）Abstract:Basedonafoundationpitprojectadjacenttoalarge-diametershieldtunnelinHangzhou,thedeformationbehavioroftheexcavationisanalyzedthroughmeasureddata.Theresultsshowthatthelateraldisplacementcurveofthedeepsoilisinabow-shapeddistributionduringtheexcavation.Moreover,theamountofthelateraldisplacementhaslong-sideandspatialeffects,andduringexcavationtheinfluencegraduallydecreasesalongthedirectionawayfromthecornerofthefoundationpit.Aftertheexcavation,therheologyofthesurroundingformationandtherelaxationofthesupportingstresshaveobvioustimeeffects,andduringexactiontheinfluenceofdisturbancecannotbeignored.Thesurroundinggroundsettlementhasa‘groove’distributionpatternalongtheoutwarddirectionandalongthelongsideofthefoundationpit.Andthegroundsettlementinthemiddlepartofthelongsideoftheexcavationisthela...
