北京地下直径线橡胶浮置板道床动力仿真计算及适应性分析

针对北京地下直径线两处小半径大坡道地段环境振动敏感点,进行铺设橡胶浮置板道床的适应性分析,为国内干线铁路环境敏感点减振轨道选型及振动控制提供理论基础。利用有限元软件,建立列车-橡胶浮置板轨道-隧道基础三维动力分析模型,对其传递特性进行分析,对最不利工况进行动力计算及适应性分析。研究结论:(1)得出橡胶浮置板道床固有频率为16.75 Hz,并在27.3 Hz之后能明显起到隔振作用;(2)通过对动车组和SS9型机车通过直线段和曲线段的全过程进行动力仿真计算,橡胶浮置板道床的行车舒适性、安全性都满足规范要求。

Dynamic Simulation Calculation and Adaptability Analysis of Rubber Floating Slab Track of Beijing Underground Transit Line

The adaptability analysis is performed at two environmental vibration sensitive points of Beijing underground transit line located in the small radius and large gradient sections. To provide a theoretical basis for the selection of vibration damping track structures near the environmental vibration sensitive points and the vibration control of the main line railway. Based on the finite element software,the three-dimensional dynamic analysis model for rain-rubber floating slab track-tunnel foundation is established to analyze the transfer characteristics,the dynamic calculation and adaptability of the most unfavorable working conditions. Research results show that( 1) the natural frequency of rubber floating slab track is 16. 75 Hz,and its vibration isolation effect becomes obvious beyond 27. 3 Hz;( 2) dynamic simulation calculation of rubber floating slab track is performed under EMU and SS9 locomotive load on both tangent and curve lines,and it is concluded that the riding comfort and the security of the rubber floating slab track meet the requirements of relevant standards and codes.