NO.3(Ser.294)JOURNALOFRAILWAYENGINEERINGSOCIETY第3期(总294)Mar2023程报道铁学2023年3月文章编号:1006-2106(2023)03-0064-07超大断面矩形顶管土体扰动分析及沉降控制姜留涛李宏波2**(1.陕西铁路工程职业技术学院,渭南714000;2.盾构及掘进技术国家重点实验室,郑州450001)摘要:研究目的:超大断面顶管施工土体扰动及沉降控制对整个工程风险控制至关重要,为探究超大断面矩形土压平衡顶管土体扰动规律及沉降控制方法,以郑州红专路下穿中州大道顶管工程为依托,通过顶管模型及土体沉降数值解分析,深入分析顶管过程参数对土体变形影响规律。研究结论:(1)矩形顶管不同因素作用下土体沉降影响数值解同实测数值较一致,验证了数值模型解的准确性;(2)通过对土体扰动影响因素进行分析,泥皮套摩阻系数对地层沉降影响较小,推力、注浆压力适当增大可抑制地表沉降,建议推力略大于1倍掌子面中心土压力,注浆压力控制在2倍上覆土层压力以内;(3)装备防背土设计、管节涂蜡、触变泥浆、渣土改良、注浆减摩等手段综合应用对减少大断面顶管土体扰动及沉降控制效果显著;(4)本研究成果可为超大断面矩形土压平衡顶管工程提供参考或借鉴。关键词:隧道;超大断面;矩形顶管;土体扰动;沉降控制中图分类号:U45文献标识码:ASoilDisturbanceAnalysisandSettlementControlofRectangularPipeJackingwithSuperLargeSectionJIANGLiutao',LIHongbo?(1.ShaanxiRailwayInstitute,Weinan,Shaanxi714000,China;2.StateKeyLaboratoryofShieldMachineandBoringTechnology,Zhengzhou,Henan450001,China)Abstract:Researchpurposes:Thesoildisturbanceandsettlementcontrolintheconstructionofsuper-largesectionpipejackingisveryimportanttotheriskcontrolofthewholeproject.Inordertoexplorethesoildisturbancelawandsettlementcontrolmethodofsuper-largesectionrectangularearthpressurebalancepipejacking,basedonthepipejackingprojectofZhengzhouHongzhuanRoadcrossingZhongzhouAvenue,throughthepipejackingmodelandnumericalsolutionanalysisofsoilsettlement,theinfluencelawofpipejackingprocessparametersonsoildeformationisdeeplyanalyzed.Researchconclusions:(1)Thenumericalsolutionofsoilsettlementunderdifferentfactorsofrectangularpipejackingisconsistentwiththemeasuredvalue,whichverifiestheaccuracyofthenumericalmodelsolution....