地铁隧道内碎石道床轨道结构减振特性分析  

Analysis on vibration reduction characteristics of ballast bed structure in subway tunnel

作　　者：彭华[1] 刘麦 蔡小培[1] 汤雪扬 PENG Hua;LIU Mai;CAI Xiaopei;TANG Xueyang(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2022年第3期88-94,共7页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：北京市科技计划(Z191100002519010);国家自然科学基金(51778050)。

摘　　要：针对目前地铁隧道内碎石道床减振性能不明确的问题,建立了车辆-碎石道床-隧道-土体空间耦合动力学模型,分析了碎石道床对隧道振动特性的影响,并与传统隧道内整体道床结构进行了对比.研究结果表明:相较于整体道床,碎石道床隧道壁1.5 m处振动加速度可减小31.4%,最大减振量为4.29 dB;随道床厚度的增加,道床及隧道壁加速度均不断降低,综合考虑减振需求、隧道限界及养护维修要求,建议地铁隧道内碎石道床厚度取350 mm;单独采用轨枕垫时,隧道壁1.5 m处加速度降低45.35%,最大减振量可达8.51 dB,对应中心频率80 Hz;单独采用道砟垫时,隧道壁1.5 m处加速度降低49.19%,最大减振量可达10.52 dB.地铁隧道内采用碎石道床轨道结构,具有良好的减振效果,可作为地铁隧道内减振轨道使用.To solve the problem that the vibration reduction performance of ballast bed in subway tun⁃nel is unclear,this paper establishes the spatial coupling dynamic model of vehicle-ballast bed tracktunnel-soil,analyzes the influence of ballast bed on vibration reduction performance in the tunnel,and compares it with the traditional integral ballast bed structure.The results show that compared with the integral ballast bed,the acceleration at 1.5 m from the tunnel wall decreases by 31.4%,and the maxi⁃mum vibration reduction is 4.29 dB.With the increase of ballast bed thickness,the accelerations of bal⁃last bed and tunnel wall decrease continuously.Considering the requirements of vibration reduction,tunnel boundary and maintenance requirements,it is suggested that the thickness of ballast bed in sub⁃way tunnel should be 350 mm.When the sleeper pad is used alone,the acceleration at 1.5 m from the tunnel wall decrease by 45.35%and the maximum vibration reduction can reach 8.51 dB,correspond⁃ing to the center frequency of 80 Hz.When the ballast pad is used alone,the acceleration at 1.5 m from the tunnel wall decreases by 49.19%and the maximum vibration reduction can reach 10.52 dB.The ballast bed structure is adopted in the subway tunnel,which shows good vibration reduction per⁃formance and can be used for vibration reduction.

关 键 词：地铁隧道 碎石道床 振动模型 减振垫 减振性能 

分 类 号：U213.9[交通运输工程—道路与铁道工程]