建筑施工·第45卷·第1期15复杂环境下的深基坑变形控制施工技术季标路笑笑中亿丰建设集团股份有限公司江苏苏州215131摘要:为解决深基坑在施工过程中变形超过控制值的问题,以苏州市某工程为案例,针对周边邻近轨交、老建筑、地下管线及河道等复杂环境特征,在基坑施工过程中对支护及开挖重难点采取了优化顺序等质量控制措施,以减少基坑变形和对周边环境的影响。通过基坑监测结果分析,变形值在各阶段均未超过控制值,证明了变形控制措施的有效性,具体措施可供类似项目参考。关键词:深基坑;复杂环境;弱变形;技术措施中图分类号:TU753文献标志码:A文章编号:1004-1001(2023)01-0015-03DOI:10.14144/j.cnki.jzsg.2023.01.004ConstructionTechnologyofDeformationControlofDeepFoundationPitUnderComplexEnvironmentJIBiaoLUXiaoxiaoZhongyifengConstructionGroupCo.,Ltd.,Suzhou215131,Jiangsu,ChinaAbstract:Inordertosolvetheproblemofdeformationexceedingthecontrolvalueduringtheconstructionofdeepfoundationpit,takingaprojectinSuzhouasacase,inviewofthesurroundingcomplexenvironmentalcharacteristicssuchasrailtransit,oldbuildings,undergroundpipelinesandrivercourses,qualitycontrolmeasuressuchasoptimizingthesequenceofkeyanddifficultpointsinsupportandexcavationweretakenduringtheconstructionoffoundationpittoreducethedeformationoffoundationpitandtheimpactonthesurroundingenvironment.Throughtheanalysisofthemonitoringresultsofthefoundationpit,thedeformationvaluedoesnotexceedthecontrolvalueineachstage,whichprovestheeffectivenessofthedeformationcontrolmeasures.Thespecificmeasurescanbeusedforreferenceinsimilarprojects.Keywords:deepfoundationpit;complexenvironment;weakdeformation;technicalmeasures积约42500m2,基坑开挖深度最大为18.9m。邻近6层老建筑的地下影院区域挖深18.9m,面积3000m2,临边长度70m。本基坑采取分坑施工,共分为①、②、③这3个分坑区域。1区主要采用钻孔灌注桩+CSM/TRD止水+3道钢筋混凝土支撑;②、③临轨分区采用地下连续墙+4道支撑。非邻近地铁侧一般剖面(图1)为:坑外地面标高-0.95m,坑底标高-18.40m,挖深17.45m;地下影院区域坑位标高-0.30m,基底深19.2m,基坑挖深18.9m;基坑等厚度水泥土止水墙深35.55~41.05m,水泥掺量20%。围护桩有4种:⌀...