双线重载铁路隧道仰拱与填充层动力响应分析
Journal of Hebei Institute of Architectural Engineering（2021）
Abstract
随着交通运输结构的升级和完善,重载铁路在不断发展,对于重载铁路隧道的研究也引起了更多的关注.论文中以建立的单洞双线隧道三维模型为基础,运用激振力函数来模拟列车的振动荷载,分别对仰拱和填充层的动力响应规律进行了分析,结果表明:填充层中最大拉应力值出现在填充层上部的中线部位,最大压应力值主要分布在填充层两端和底部,两条线路的中线附近区域为填充层结构的最不利区域;双线隧道在同种列车荷载作用下,仰拱结构所受拉应力远大于所受压应力,破坏受抗拉强度控制,两线路中线位置的仰拱竖向动应力峰值比单侧轨道下方的仰拱动应力峰值高出了约58％,加速度比单侧轨道下方高出了约1.5倍,受到的拉应力和剪应力相较于仰拱其他部位为最大,双线隧道的仰拱中心处应适当增大配筋率并加强安全支护设计;不同列车轴重下的仰拱和填充层动力响应规律基本相同,随着轴重的增大,仰拱及填充层的应力、加速度、竖直方向的动应力都有明显的增加.
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