软土地层中盾构施工参数对管片上浮的影响研究的中期报告.docx

软土地层中盾构施工参数对管片上浮的影响研究的中期报告
摘要：
盾构施工过程中，软土地层管片上浮是一种常见的问题，严重影响盾构隧道的施工安全和工程质量。本研究在实际盾构施工过程中，对影响管片上浮的参数进行了分析和研究。主要通过盾构隧道的实测数据和现场观测，分析了软土地层的土性参数、盾构机的施工参数、管片参数和隧道环境参数对管片上浮的影响。研究结果表明：软土地层的压缩模量与管片上浮量成反比，强度指标与管片上浮量成正比；盾构机的前导轮和刀盘的旋转速度、刀盘切削厚度和施压力都会影响管片上浮量；管片径向接触应力对管片上浮量的影响较大，过大或过小都会增加管片上浮的风险；隧道环境参数，如地下水位、土体含水率等也会影响管片上浮量。根据研究结果，提出了管片上浮的控制方法和建议。
关键词：盾构；软土地层；管片上浮；施工参数；土性参数
Abstract：
Duringtheshieldtunnelingconstruction,theproblemofpipefloatationinsoftsoilisacommonissue,whichseriouslyaffectsthesafetyandengineeringqualityofshieldtunneling.Inthisstudy,theparametersaffectingpipefloatationwereanalyzedandstudiedduringactualshieldtunnelingconstruction.Mainlythroughthemeasurementdataandon-siteobservationoftheshieldtunnels,theimpactofsoilparameters,shieldmachineconstructionparameters,pipeparametersandtunnelenvironmentalparametersonpipefloatationinsoftsoilwasanalyzed.Theresearchresultsshowthatthecompressivemodulusofsoftsoilisinverselyproportionaltothepipefloatation,andthestrengthindexisproportionaltothepipefloatation;therotationspeedoftheshieldmachine'sleadingwheelandcutterhead,thecuttingthicknessofthecutterhead,andthepressureapplicationalsoaffectthepipefloatation;theradialcontactstressofthepipehasasignificantimpactonthepipefloatation,whichwillincreasetheriskofpipefloatationifitistoohighortoolow;tunnelenvironmentalparameters,suchasgroundwaterlevelandsoilmoisturecontent,alsoaffectthepipefloatation.Basedontheresearchresults,controlmethodsandsuggestionsforpipefloatationwereproposed.
Keywords:shieldtunneling；softsoil；pipefloatation；constructionparameters；soilparameters