列车荷载长期作用下隧道地基固结变形的数值分析
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摘要
研究目的:分析地基在不同加载次数下的动力反应和沉降规律。数值分析方法中建立三维有限元模型,采用与不平顺管理标准相应的激振力来模拟列车动荷载,采用摩尔-库仑塑性本构模型描述地基土体的受力特性。研究结论:在列车初次运行期间内,地面沿轴向的差异沉降较大,沉降变化是不稳定的;隧道衬砌底部、顶部沉降的变化趋势一致。随着埋深的减少,地基沉降逐渐增加。多次加载过程中,隧道中部的沉降较大并向两端减少;随着运行次数的增多,隧道中部沉降的增加趋势逐渐减弱但其长期累积作用不可忽视;因此,对于长期列车动载作用下地基的变形问题而言,采用塑性本构模型可以合理反应地基土变形的长期累积性。
Research purposes: The analysis is made for the dynamic response and deformation law of the foundation under the different loading quantities of train.The spatial FEM model is established in the numerical analysis.The exciting force corresponding to the irregularity management standard is adopted to simulate the train load and the M-C plastic constitutive model is used to present the load bearing characteristics of the tunnel foundation. Research conclusions:During the the initial running of the train,the ground differential deformation along axial direction is big and the deformation change is variable.The settlements on the bottom and top of the tunnel lining trends to consistent.With the decrease of the buried depth of the tunnel,the foundation deformation increases.During loading of some times,the deformation on the middle part is big and decreases gradually along the longitudinal direction to the two ends.After long time running of the train,the deformation on the middle part increases,but its long-term effect should not ignored.Application of the plastic constitutive model can reasonably present the accumulation of foundation deformation under the effect of long-term load of the train.
Research purposes: The analysis is made for the dynamic response and deformation law of the foundation under the different loading quantities of train.The spatial FEM model is established in the numerical analysis.The exciting force corresponding to the irregularity management standard is adopted to simulate the train load and the M-C plastic constitutive model is used to present the load bearing characteristics of the tunnel foundation. Research conclusions:During the the initial running of the train,the ground differential deformation along axial direction is big and the deformation change is variable.The settlements on the bottom and top of the tunnel lining trends to consistent.With the decrease of the buried depth of the tunnel,the foundation deformation increases.During loading of some times,the deformation on the middle part is big and decreases gradually along the longitudinal direction to the two ends.After long time running of the train,the deformation on the middle part increases,but its long-term effect should not ignored.Application of the plastic constitutive model can reasonably present the accumulation of foundation deformation under the effect of long-term load of the train.
引文
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[2]Monismith C L,Ogawa N and Freeme C R.PermanentDeformation Characteristics of Subgrade Soils due toRepeated Loading[C]//Transp.Res.Rec.No.537.Transportation Research Board.Washington,D.C.,1975.
[3]Kaynia A M.Madhus C.Zackrisson P.GroundVibration from High-speed Rains:Prediction andCountermeasure[J].Journal of GeotechnicalGeoenvironmental Engineering,2000(6):531-537.
[4]梁波,蔡英.不平顺条件下高速铁路路基的动力分析[J].铁道学报,1999(2):84-88.Liang Bo,Cai Ying.Dynamic Analysis on Subgrade ofHigh Speed Railways in Geometric Irregular Condition[J].Journal of the China Railway Society,1999(2):84-88.
[5]孔戈.盾构隧道地震响应分析及抗减震措施研究[D].上海:同济大学,2007Kong Ge.Study on Seismic Response Analysis andShock Absorption Measures of Shield Tunnel[D].Shanghai:Tongji University,2007.
[6]王国波.软土地铁车站结构三维地震响应计算理论与方法的研究[D].上海:同济大学,2007.Wang Guobo.Study on Calculation Theory and Methodof Three Dimensional Seismic Response of SubwayStation Structures in Soft Soil[D].Shanghai:TongjiUniversity,2007.
[7]黄腾,孙景领,陶建岳,等.地铁隧道结构沉降监测及分析[J].东南大学学报(自然科学版),2006(2):262-266.Huang Teng,Sun Jingling,Tao Jianyue,etc.Subsidence Monitoring and Analyzing in Subway TunnelConstruction[J].Journal of Southeast University(Natural Science Edition),2006(2):262-266.
[8]张会刚,姜志玲,章玉伟.深圳地铁隧道邻接施工沉降数值模拟研究[J].铁道工程学报,2009(10):55-58.Zhang Huigang,Jiang Zhiling,Zhang Yuwei.Researchon the Numerical Simulation of Subsidence of ExistingTunnel Caused by AdjacentM etro TunnelConstructionin Shenzhen[J].Journal of Railway EngineeringSociety,2009(10):55-58.
[9]吴波,刘维宁,索晓明,等.地铁施工近邻桥基加固效果三维数值分析[J].铁道工程学报,2005(5):48-52.Wu Bo,Liu Weining,Suo Xiaoming,etc.Research onthe Reinforcing Effect of Adjacent Short Pile BridgeFoundation in Metro Station Construction[J].Journalof Railway Engineering Society,2005(5):48-52.
[10]楼晓明,郑俊杰,章荣军.隧道施工引起的地表变形数值模拟[J].铁道工程学报,2007(9):62-66.Lou Xiaoming,Zheng Junjie,Zhang Rongjun.Simulation of Numerical Values of Surface DeformationCaused by Tunne Construction[J].Journal of RailwayEngineering Society,2007(9):62-66.
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