【摘要】 基于Abaqus软件64CPU并行计算集群平台,建立了车辆-轨道-高架桥-基础-地基耦合的三维有限元分析模型。得到了不同工况下列车运行时引起的地表振动特征,对地表振动振级随着与桥墩距离增大而衰减的规律进行了参数化分析,结果表明,随着列车车速的增大,地表振动振级明显增大;与空载时相比,列车乘客满载时仅靠近桥墩处的地表振级略微增大,对远处几乎无影响;列车车厢数量对地表振动振级的影响不明显;列车双线运行时引起的地表振动振级比单线运行时有明显的增大。扣件刚度的增大会略微减小地表振动振级。随着桩长的增加,地表振动振级有较大幅度的减小;增加桥墩的跨度能减小地表振动振级,但增加到一定值时再增加也不会有明显的减振效果;桥墩高度对地表振动振级无明显影响。随着场地土层剪切波速的增加,地表振动振级呈逐渐减小的趋势。更多还原

【Abstract】 Based on the Abaqus software 64 CPU parallel computing cluster platform,a three-dimensional finite element model of train-track-viaduct-foundation-soil coupling is established.Ground surface vibration characters caused by trains running under different conditions are obtained;and the law about that ground surface vibration level decreases with the increased distance between the ground surface and the viaduct pier is parametrically analyzed.Then the main conclusions are drawn as follows.With the increased train speed,ground surface vibration level increases obviously.The fully loaded train capacity only slightly increases ground surface vibration level of the site near pier,having little effect on the site away from pier.The number of carriages has no obvious effect on ground surface vibration level.Ground surface vibration level under train running in double line is much greater than it under train running in single line.The increase of fastener stiffness could slightly decrease ground surface vibration level.With the increase of pile length,ground surface vibration level decreases much.The increase of pier span could decrease ground surface vibration level,however,when pier span increases to a certain value,there isn’t apparent effect on vibration reduction.Pier height has no apparent effect on ground surface vibration level.The ground surface vibration level tends to gradually decrease with the increase of shear wave velocity of soil.更多还原