地铁均布荷载引起地基土的沉降分析
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摘要
分析了地基土在地铁均布荷载作用下的沉降规律。结果表明:在单次列车运行期间内,地面的沉降较大,并且呈现波动现象;在双面加载过程中,隧道纵向中间部分的沉降较大;长期累积作用不可忽视;由于地基土沉降以不可恢复的塑性永久变形为主,因此,对于长期列车动载作用下地基的变形问题,采用塑性本构模型能较好地描述地基土变形的不可恢复性和长期累积性。
In this text,it has shown the regularity of foundation settlement under uniformly load of subway.It can be seen that: during the single train runtime,settlement of ground surface is larger,and fluctuated.Under the double uniformly load of subway,settlement is larger in the middle of longitudinal direction of tunnel.The effecti of long-term buildup can not be ignored.Because foudation settlement is mainly composed of unrecoverable plastic deformation,as to the problem of long-term dynamic loads of subway,plastic constitutive relation is more suitable.That will be better to describe the characteristic of unrecoverable and long-term buildup of foundation soil.
In this text,it has shown the regularity of foundation settlement under uniformly load of subway.It can be seen that: during the single train runtime,settlement of ground surface is larger,and fluctuated.Under the double uniformly load of subway,settlement is larger in the middle of longitudinal direction of tunnel.The effecti of long-term buildup can not be ignored.Because foudation settlement is mainly composed of unrecoverable plastic deformation,as to the problem of long-term dynamic loads of subway,plastic constitutive relation is more suitable.That will be better to describe the characteristic of unrecoverable and long-term buildup of foundation soil.
引文
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[5]刘明,黄茂松.地铁荷载作用下饱和软粘土的长期沉降分析[J].地下空间与工程学报.2006,2(5):813-817.
[6]李进军,黄茂松.交通荷载作用下软土地基累积塑性变形分析[J].中国公路学报,2006,19(1):1-5.
[7]郑永来,李美利.软土隧道渗漏对隧道及地面沉降影响研究[J].岩土工程学报,2005,27(2):243-247.
[8]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,1999,21(2):84-88.
[9]陈卫军.列车振动荷载作用下上下近距离交叠地铁区间隧道周围土体液化及振陷研究[D].上海:同济大学,2003.
[10]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,2007.
[11]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.
[2]Andersen L,Nielsen S R K,Iwankiewicz R.Vehicle Moving Along an Infinite Euler Beamwith Random Surface Irregularities on A KelvinFoundation[J].ASME J Appl Mech,2002,69:69-75.
[3]Kaynia A M.Madhus C,Zackrisson P.GroundVibration from High-speed Rains:Prediction andCountermeasure[J].Journal of GeotechnicalGeoenvironmental Engineering,2000,126(6):531-537.
[4]Hall L.Simulations and Analyses of Train-induced Ground Vibrations,a ComparativeStudy of Two-and Three-dimensionalCalculations with Actual Measurements[D].Sweden,Division of Soil and Rock Mechanics,Departments of Civil and EnvironmentalEngineering,Royal Institute of Technology,2000.
[5]刘明,黄茂松.地铁荷载作用下饱和软粘土的长期沉降分析[J].地下空间与工程学报.2006,2(5):813-817.
[6]李进军,黄茂松.交通荷载作用下软土地基累积塑性变形分析[J].中国公路学报,2006,19(1):1-5.
[7]郑永来,李美利.软土隧道渗漏对隧道及地面沉降影响研究[J].岩土工程学报,2005,27(2):243-247.
[8]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,1999,21(2):84-88.
[9]陈卫军.列车振动荷载作用下上下近距离交叠地铁区间隧道周围土体液化及振陷研究[D].上海:同济大学,2003.
[10]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,2007.
[11]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.
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