盾构隧道同步注浆浆液压力时空分布规律

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1、盾构隧道同步注浆浆液压力时空分布规黄林冲中山大学工学院盾构隧道施工过程屮同步注浆浆液压力变化对邻近管片结构内力分布有较大影响，为实现对注浆压力的精细化控制，保证盾构安全掘进，研宂浆液压力的时空分布规律。在考虑浆液粘度和地层渗透系数时变性的基础上，统一了同步注浆过程中浆液填充、扩散与消散过程，得到了浆液压力沿管片环向与纵向分布的理论计算式。依托工程实例及浆液流变试验结果，建立数值模型，得到了浆液压力沿管片三维时空分布规律。研究表明：同步注浆过程屮浆液固结及注浆压力的衰减对浆液压力分布影响较大。浆液粘度增大，浆液流动性与地层滲透系数逐渐减小，使浆液压力沿管片扩散及消散幅度减小，进而影响管片内

2、力分布。考虑了浆液压力时空变化特性的计算模型使管片受力特征与现场实测结果更加接近。研宄成果为精细化分析施工阶段管片受力提供了计算依据。关键词：盾构隧道;同步注浆;浆液压力消散;浆液粘度时变性;管片受力;梁禹（1986一），男，，副研究员；黄林冲（1980—），男，副教授，生导师，hlinch@mail.sysu.edu.cn基金：国家自然科学某金资助项FI（51708564,51678578）Groutpressuredistributioncharacteristicsinspace-timedomainofshieldtunnelsduringsynchronousgroutingL

3、IANGYuHUANGLinchongSchoolofEngineering，SunYat-SenUniversity;Abstract：Thevariationofsynchronousgroutingpressurehasasignificanteffectontheinternalforcedistributionofadjacentsegments.Tocontrolofgroutingpressureaccuratelyandkeepsafetyduringshielddriving，thegroutpressuredistributionsinspace-timedomain

4、wereinvestigated.Byconsideringoftime-variationbehaviorofgroutviscosityandpermeability，theprocessofgroutfilling，diffusionanddissipationduringshieldbackfilledgroutingwereunited.Then,thetheoreticalformulasofgroutingpressuredistributionalongthecircularandlongitudinaldirectionofsegmentswerebuilt.Final

5、ly,agroutrheologicaltestandnumericalmodelswereconductedbasedontheengineeringcase,thetime-spacedistributionlawofgroutpressureactingontunnelsegmentswereobtainedandanalyzed.Theresultsshowthatthegroutconsolidationandpressuredissipationduringsynchronousgroutinghavenotableinfluenceondistributionofgrout

6、ingpressurealongsegments.Theincreaseofgroutviscosityanddecreaseofgroutliquidityandpermeabilityofsoillayersaffecttheextentofgroutingpressuredissipation，andthenaffectthedistributionofinternalforceoftunnelsegments.Themechanicalfeaturesofsegmentscalculatedfromnumericalmodelsareclosertofieldmeasuredda

7、tawhenconsideringthetime-varyingeffectofgroutviscosity.Theresearchresultsprovideaguidelineforfineanalysisofsegmentmechanicsduringconstruction.Keyword：shieldtunnel;synchronousgrouting;groutingpressuredissipation;variati