不同土质地段地铁列车振动加速度响应分析  

Vibration acceleration response analysis of subway train in different soil areas

作　　者：张鹏 Zhang Peng(China Academy of Railway Sciences(Shenzhen)Research and Design Institute Co.,Ltd,Shenzhen,Guangdong,518100,China)

机构地区：[1]铁科院(深圳)研究设计院有限公司,广东深圳518000

出　　处：《湖南城市学院学报（自然科学版）》2023年第5期15-20,共6页Journal of Hunan City University:Natural Science

摘　　要：为了比较地铁在不同土质地段运行时对周围环境的影响,选取了4种不同的隧道介质环境(软土、砂土、碎石土和硬质岩石),通过地铁列车-整体式道床耦合动力学模型计算得到轮轨相互作用力,并将其作为外部激励施加到轨道-隧道-土体有限元模型中进行动力学计算,从而分析轨道结构和土体的动力响应﹒研究结果表明:随着地铁隧道介质弹性模量和密度的增大,道床和隧道壁的位移和加速度均逐渐减小;沿隧道顶部垂直至地表面方向,距隧道中心3.35~10m的位置,软土、砂土、碎石土和硬质岩石地段对应的振动加速度依次减小了79.2%、71.85%、62.98%和26.64%;沿隧道中心线正上方地面位置的横向方向,距隧道中心12.5~26 m的位置,软土、砂土、碎石土和硬质岩石的振动加速度依次减小了68.14%、62.96%、49.06%和46.49%;对于不同的隧道介质环境,道床和隧道壁的振动加速度主频均主要集中在40~80Hz.In order to compare the influence of subway running in different soil areas on the surrounding environment,by selecting four different tunnel medium environments(soft soil,sandy soil,gravel soil and hard rock),the coupling dynamics model of subway train-integral track bed is used to calculate the wheel-rail interaction force.It is applied as an external excitation to the rail-tunnel-soil finite element model for dynamic calculation,and the dynamic response of rail structure and soil is analyzed.The results show that with the increase of elastic modulus and density of subway tunnel medium,the displacement and acceleration of tunnel bed and tunnel wall decrease gradually.Along the vertical direction from the top of the tunnel to the ground surface,from 3.35 to 10 m from the tunnel center,the corresponding vibration acceleration of soft soil,sandy soil,gravel soil and hard rock decreases by 79.2%,71.85%,62.98%and 26.64%respectively.Along the transverse direction of the ground position directly above the tunnel center line,from 12.5 to 26 m away from the tunnel center,the vibration acceleration of soft soil,sandy soil,gravel soil,hard rock decreases by 68.14%,62.96%,49.06%and 46.49%respectively.In addition,for different tunnel environments,the main frequency of vibration acceleration of tunnel bed and tunnel wall is mainly concentrated between 40 to 80 Hz.

关 键 词：地铁振动 动力学分析 加速度衰减 车辆-轨道耦合动力学 

分 类 号：TU921[建筑科学—建筑设计及理论]