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土木工程毕业论文.doc

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土木工程毕业论文.doc

土木工程毕业论文高速铁路路基沉降控制技术MethodologyofSettlementControlforHighSpeedRailwayEmbankment专业土木工程摘要高速铁路代表了世界铁路现代化发展的大趋势,是21世纪交通运输的重大成果,是人类的共同财富。随着经济的迅猛发展,交通运输需求激增,我国铁路客运专线建设已经进入一个高速发展的时期,由于高速铁路运行速度快、技术标准高、对路基的要求严格,控制路基变形沉降已经成为客运专线路基的最大特点。路基变形最明显、危害最大的问题是路基沉降。路基沉降控制是一个涉及因素较多、具有较大不确定性的工程难题。路基沉降包括路基施工沉降和工后沉降,工后沉降尤其发生几率大、危害严重。本论文从黄土的性质和特性,路基沉降的原因、危害,控制路基沉降的措施、路基工后沉降的机理,控制路基工后沉降的必要性、步骤、措施、各种措施的特点,路基沉降计算、监测等方面分析了路基沉降。关键字黄土路基工后沉降控制方式沉降计算监测AbstractHighspeedrailwayrepresentstherailwaymodernizationdevelopmenttrendinthe21stcentury,istheimportantachievementoftransportation,isthecommonwealthofmankind.Alongwiththerapiddevelopmentofeconomy,thetransportationdemand,ChinarailwayPDLsurgehasenteredarapiddevelopmentconstructionperiod,Duetothehighspeedrailwayrunningspeed,thetechnicalstandardofroadbed,strictcontrolofsubgradesettlementofdeformationandhasbecomethebiggestcharacteristicofPDLroadbed.Themostobviousharm,roadbeddeformationofthebiggestproblemsistheembankmentsettlement.Embankmentsettlementcontrolisonewhichinvolvesmanyfactors,haslargeuncertaintiesofengineeringproblems.Embankmentsettlementincludingsubgradeconstructionsettlementandpostconstructionsettlement,postconstructionsettlementrisk,particularlyseriousharm,Thispaperfromthenatureandcharacteristicsofloessembankmentsettlement,thereasonandharm,thecontrolmeasuresofembankmentsettlementandroadbedsettlementmechanism,Controlofsubgradesettlementafterthenecessity,stepsandmeasures,andthecharacteristicsofmeasures,embankmentsettlementcalculation,monitoringofembankmentsettlement.KEYWORDSsiennaembankmentsettlementcontrolmodesettlementcalculationdetectio目录第1章绪论.........................................................................................................................11.1选题背景及意义....................................................................................................11.2铁路路基................................................................................................................11.2.1我国铁路路基现状.....................................................................................21.2.2国外铁路路基现状.....................................................................................21.3黄土........................................................................................................................21.3.1黄土的颗粒组成会及结构.........................................................................31.3.2黄土的多孔性.............................................................................................31.3.3黄土的湿陷性与变形特性.........................................................................31.3.4黄土的结构性问题.....................................................................................41.3.5压实黄土的工程特性研究现状.................................................................5第2章路基沉降........................................................................................................................................................72.1路基沉降................................................................................................................72.1.1高速铁路路基沉降特性分析的研究现状.................................................72.1.2路基沉降的原因.........................................................................................72.2路基强度高且刚度大以及均匀性要求高............................................................92.3路基不均匀沉降的影响和危害............................................................................92.3.1路基不均匀沉降对铺轨施工的影响..........................................................92.3.2路基对称将对高铁运营的危害..................................................................92.4客运专线无砟轨道路基的填料要求....................................................................92.5客运专线无砟轨道路基填筑的压实标准..........................................................112.6客运专线无砟轨道路基沉降的控制理念..........................................................122.7客运专线无砟轨道路基沉降的控制要求..........................................................13第3章路基沉降的控制...................................................................................................153.1路基各种处理措施效果评价..............................................................................153.2影响路基沉降的因素..........................................................................................173.2.1影响沉降稳定的自然因素.........................................................................173.2.2影响沉降稳定的人为因素.........................................................................183.3湿陷性黄土路基处理方法及效果评价..............................................................183.3.1试验段工程地基处理方法.........................................................................183.3.2地基处理效果方法.....................................................................................193.3.3湿陷性黄土路基的沉降控制措施.............................................................193.4路基工后沉降......................................................................................................203.4.1路基工后沉降组成分析.............................................................................213.4.2工后沉降控制的重要性与特点.................................................................213.4.3工后沉降控制的必要性.............................................................................223.5控制工后沉降的主要途径..................................................................................223.5.1加强技术培训及明确控制标准.................................................................223.5.2重视黄土地质核查.....................................................................................223.6工后沉降的控制步骤..........................................................................................233.6.1施工前的控制措施.....................................................................................233.6.2施工过程中的控制措施.............................................................................233.6.3加强路基沉降分析与预测.........................................................................243.6.4做好路基沉降观测.....................................................................................243.7工后沉降控制的现有技术措施..........................................................................24第4章地基设计与沉降计算...........................................................................................264.1桩网地基设计......................................................................................................264.1.1CFG桩桩网复合地基....................................................................................274.1.2灰土桩桩网结构...........................................................................................334.2桩板结构..............................................................................................................354.2.1整体构造分析...............................................................................................354.2.2结构几何尺寸优化.......................................................................................364.2.3承台板设计...................................................................................................364.2.4托梁设计.......................................................................................................374.2.5桩基设计.......................................................................................................374.3DDC桩...................................................................................................................404.3.1适用性及沉降控制机理分析.......................................................................404.3.2沉降计算模式...............................................................................................414.3.3复合地基下部土体的沉降...........................................................................424.4水泥土挤密桩......................................................................................................434.4.1水泥土挤密桩在国内外的应用...................................................................444.4.2水泥土其它影响因素及有关性能研究.......................................................44

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