武广高铁某涵路过渡段动力特征分析
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摘要
以武广高铁密集涵洞过渡段为例,建立了列车-轨道耦合的三维动力学分析模型,分析了350km/h高速行车条件下过渡段路基的动力响应特性。分析表明:①过渡段路基基床表层、底层的竖向振动的位移、速度、加速度均在涵洞顶最小,在涵洞侧面出现较快速增长;动应力的变化趋势则与之相反,在涵洞顶最大,涵洞两侧逐渐降低。②动响应沿路基深度呈指数函数形式衰减,基床表层至基床底层衰减较快,路基面下1m左右动响应幅值衰减渐趋于平缓,路基面下3m动响应衰减基本趋于稳定。其中振动加速度衰减最为明显,动位移、振动速度、动应力衰减则相对较缓。现场实车试验测试值与仿真计算值较为接近,表明采用的仿真分析方法较为可靠。
This paper presents the three dimensional dynamic analysis of train-track system in a transition zone over culverts in the Wuhan-Guangzhou high speed rail project.The dynamic response of the subgrade of the transition zone under an operational train speed of 350km/h is studied.The following results are observed:1)The dynamic displacement,vibration velocity and acceleration of the soils particles in the vertical direction at both the top and the bottom of the subgrade have minimum values at the crown of culverts.A rapid increase of these values can be found at the culvert sides.The dynamic stress distributions are at the opposite of the trend:It reaches the maximum value at the crown of culverts and creases towards the sides.2):The degradation of the dynamic stress has an exponential relationship with depth and a plat pattern can be found at a depth of one meter below the ground.At a depth of three meters below the ground,the dynamic stress approaches a constant value.A rapid decease in the vibration acceleration can be found and the dynamic displacement,vibration velocity and dynamic stress have flatter reduction.The in-situ monitoring results are similar to the numerical analysis results.
This paper presents the three dimensional dynamic analysis of train-track system in a transition zone over culverts in the Wuhan-Guangzhou high speed rail project.The dynamic response of the subgrade of the transition zone under an operational train speed of 350km/h is studied.The following results are observed:1)The dynamic displacement,vibration velocity and acceleration of the soils particles in the vertical direction at both the top and the bottom of the subgrade have minimum values at the crown of culverts.A rapid increase of these values can be found at the culvert sides.The dynamic stress distributions are at the opposite of the trend:It reaches the maximum value at the crown of culverts and creases towards the sides.2):The degradation of the dynamic stress has an exponential relationship with depth and a plat pattern can be found at a depth of one meter below the ground.At a depth of three meters below the ground,the dynamic stress approaches a constant value.A rapid decease in the vibration acceleration can be found and the dynamic displacement,vibration velocity and dynamic stress have flatter reduction.The in-situ monitoring results are similar to the numerical analysis results.
引文
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[3]李献民,王永和,倪宏革,等.动力分散型机车在路涵过渡段的动应力-应变研究[J].岩土力学,2004,25(7):1167-1170.
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[7]郭建湖.高速铁路碎石类A、B组填料的动力特性研究[J].土工基础,2012,26(5):116-120.
[8]中铁第四勘察设计院集团有限公司.客运专线无砟轨道过渡段路基理论分析与数值仿真计算研究分报告[R].武汉:中铁第四勘察设计院集团有限公司,2009,11.
[9]Luo,Z.,Ku,C.S.,Bu,L.Probabilistic model for long-term deformation of subgrade bed soil in upgrading-speed railway lines[J].International Journal of Pavement Research and Technology,2011,4(1):34-40.
[10]张占荣,武广高铁红黏土地基沉降计算方法研究[J].铁道工程学报,2011,4:9-14,87.
[11]王文娟,曾良才,蒋俊等.轨道路基动力响应液压激振系统仿真[J].机床与液压,2011,39(21):138-141.
[2]郭建湖.高低不平顺条件下高速铁路桥—隧过渡段路基的动力特性[J].铁道科学与工程学报,2008,5(4):7-13.
[3]李献民,王永和,倪宏革,等.动力分散型机车在路涵过渡段的动应力-应变研究[J].岩土力学,2004,25(7):1167-1170.
[4]宫全美,罗喆,袁建议.提速铁路基床长期累积沉降及等效循环荷载试验研究[J].铁道学报,2009,31(2):88-93.
[5]Leykauf Gunther,Mattner Lothar.Elastisches Verformungs ver-Halten des Eisenbahnoberbaus.Eisenbahnigenieur,1990,4l(3):111-119.
[6]徐红星.高速铁路桥路过渡段动应力测试与分析[J].铁道工程学报,2012,8:1-5.
[7]郭建湖.高速铁路碎石类A、B组填料的动力特性研究[J].土工基础,2012,26(5):116-120.
[8]中铁第四勘察设计院集团有限公司.客运专线无砟轨道过渡段路基理论分析与数值仿真计算研究分报告[R].武汉:中铁第四勘察设计院集团有限公司,2009,11.
[9]Luo,Z.,Ku,C.S.,Bu,L.Probabilistic model for long-term deformation of subgrade bed soil in upgrading-speed railway lines[J].International Journal of Pavement Research and Technology,2011,4(1):34-40.
[10]张占荣,武广高铁红黏土地基沉降计算方法研究[J].铁道工程学报,2011,4:9-14,87.
[11]王文娟,曾良才,蒋俊等.轨道路基动力响应液压激振系统仿真[J].机床与液压,2011,39(21):138-141.