浅谈加筋水泥土挡墙型钢与水泥土作用机理研究

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1、天津大学硕士学位论文加筋水泥土挡墙型钢与水泥土作用机理研究姓名：陈静申请学位级别：硕士专业：结构工程指导教师：郑刚20070501中文摘要传统的SMW工法是基于深层搅拌桩施工方法发展起来的，主要以型钢等加强芯为主承担荷载和提供刚度，而对于水泥土的刚度仅作为安全储备。目前，对于一些开挖深度不大的基坑工程，SMW工法技术得到了进一步改进。本文所讨论的加筋水泥土墙就是在水泥土墙受拉区加入型钢，克服了水泥土抗拉刚度低的缺点，充分发挥水泥土刚度和型钢的受拉性能，从而可以大大地减少墙厚，节省材料，‘具有良好的经济效益。本文采用有限元软件Plaxis对加筋水泥土挡墙进行分析。按照平面应变问

2、题考虑，土体模型采用硬化土体模型，通过接触面的设置考虑土与水泥土挡墙及水泥土挡墙与型钢之间的相互作用。文中着重研究加筋水泥土挡墙这一支护结构在七种不同条件下(不同型钢厚度、不同型钢位置、不同型钢插入深度、不同水泥土刚度、不同水泥土墙体厚度、不同水泥土墙体插入深度、不同土体刚度)位移变化规律，水泥土截面应力分布规律，型钢应力变化规律及水泥土与型钢相互作用规律。关键词：基坑工程加筋水泥土受拉区有限元ABSTRACTThedevelopmentoftraditionalSMW(SoilMixingWall)methodisbasedontheconstractionmethodof

3、deep-seatedmixingwall，whoseloadandstiffnessmostlydependsonthereinforcedmaterialsuchasshapedsteel，thestiffessofcementedsoilonlyisregardedassafedeposit．PresentlySMWmethodisimpovedonforsomeexcavationwhosedepthisnottoodeep．Inthispaperthe&awedareaofreinforcedcementedsoilretainingwallisreinforced

4、byshapedsteel．Thisformcangetovertheshortcomingoflow&awedstiffnessofcementedsoil，andcanexertadequatelythestiffnessofcementedsoilandthedrawedstrengthofshapedsteel。Consequentlythethicknessofcementedsoilwallmaybeminishedconsumedlyandthematerialcanbeeconomized．Sothismethodhasawelleconomybenefit．

5、Inthispaper'theFEMsoftwarePlaxisisusedtoanalysethereinforcedcementedsoilretainingwallusingplanestrainassumption，andthehardening—soilmodelisemployedfortheconstitutiverelationshipofsoil，andaninteractionsurfaceissetnotonlybetweenthesoilandcementedsoilretainingwallbutalsobetweencementedsoilreta

6、iningwallandshapedsteel．Inthispaperthedisplacementofthereiningstructureandthestressdistributingofcementedsoilsection，thestresschangeofshapedsteel，theinteractionalrelationshipbetweencementedsoilandshapedsteelareanalysedinsevendifferentconditions(differentthicknessofshapedsteel，differentposit

7、ionofshapedsteel，differentlengthofshapedsteel，differentstrengthofcementedsoil，differentthicknessofretainingwall，differentlengthofretainingwall，differentstrengthofsoil)．KEYWORDS：Excavation，reinforcedcementedsoil，drawedarea，FEM独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的