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列车相向运行对双线无砟轨道高速铁路路基动应力响应分析

Keywords: 高速铁路,路基,等效应力,相向运行

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Abstract:

为了研究在不同高速列车相向运行速度组合作用下双线铁路路基结构的动应力响应,运用ABAQUS软件,建立了列车相向高速运行的双线高速铁路车辆-轨道-路基系统的动力有限元模型.结果表明:在两列动车组相向运行作用下,基床表层及底层表面沿线路横向动应力分布不对称,路基本体表面动应力分布相对对称;动应力在距基床表层表面2.7m范围内呈线性衰减,动应力降至路基最大应力的50%左右;在2.7~7.2m范围内,等效应力幅值衰减速度有所减缓,7.2m至更深的范围内,动应力衰减最为缓慢;在深度为4.5m左右至更深的范围内动车组相向运行速度越快等效应力幅值越低;基床表层动应力随动车组纵向间距的变化呈双驼峰形分布,分别在2列动车组的一位和二位转向架横向同轴时达到驼峰;随着动车组相向运行速度的提高,列车荷载所引起的动应力振幅增大,对基床表层的影响更持久、损伤更大.

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