高铁荷载下路堤和路堑段地面振动特性现场测试与数值分析  

On site testing and numerical analysis of ground vibration characteristics ofembankments and cutting sections under high-speed rail load

作　　者：毕俊伟 张继严 高广运[4] 汪益敏[1] BI Junwei;ZHANG Jiyan;GAO Guangyun;WANG Yimin(School of Civil Engineering&Transportation,South China University of Technology,Guangzhou 510641,China;School of Civil Engineering,North China University of Technology,Beijing 100144,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]华南理工大学土木与交通学院,广州510641 [2]北方工业大学土木工程学院,北京100144 [3]北京工业大学城市建设学部,北京100124 [4]同济大学土木工程学院,上海200092

出　　处：《振动与冲击》2024年第11期194-205,共12页Journal of Vibration and Shock

基　　金：国家自然科学基金自助项目(51978510;42277130);广东省科技计划项目(2017A050501005)。

摘　　要：对巴黎-布鲁塞尔高速铁路地面振动开展现场测试,对比分析了高铁运行引起的路堤和路堑段地面振动特性以及传播衰减规律。基于2.5维有限元法基本原理,推导并建立了高铁荷载下路堤和路堑段2.5维有限元动力计算模型,详细讨论了路堤和路堑设计参数对地面振动特性的影响。结果表明:距轨道较近处的地面振动幅值主要受列车轴重影响,而距轨道较远处则由中间车相邻转向架轮对的叠加效应主导。高铁运行引起的路堤和路堑段地面振动随与轨道距离增加而减小,中高频成分振动的衰减速率显著大于其他频段。路堤和路堑段地面振动1阶主频主要由列车荷载的基频f_1主导,随车速提高逐渐向高频方向移动。路堤和路堑对地面振动的衰减规律有重要影响,路堤段地面振动随与轨道间距的衰减过程可分为两个阶段,而路堑段地面振动衰减过程则可分为三个阶段,且振动在堑顶处有较为明显的局部放大现象。当与路堤段轨道间距≥19.0 m(路堑段≥23.0 m)后,地面振动Z振级VL_Z均小于80.0 dB。同时,高铁荷载下地面振动随路堤高度或路堑深度的增加而减小,当超过某一限值时,继续增加路堤高度或路堑深度难以有效减小地面振动。路堤段地面振动随路堤弹性模量的增大而减小。此外,在确保稳定性的前提下,较陡的路堑边坡更有利于减小高铁运行引起的地面振动。Here,on site testing was conducted for ground vibration of Paris-Brussels high-speed railway,and ground vibration characteristics and propagation decay laws of embankments and cutting sections caused by high-speed train operation were analyzed contrastively.Based on the basic principle of 2.5-dimensional finite element method,a 2.5-dimensional finite element dynamic calculation model for embankment and cutting section under high-speed rail load was derived and established.Effects of embankment and cutting design parameters on ground vibration characteristics were discussed in detail.The results showed that ground vibration amplitude near track is mainly affected by train axle load,while the superposition effect of adjacent bogie wheelsets of middle cars is dominant at farer away from track;ground vibration of embankments and cutting sections caused by high-speed train operation decreases with increase in distance from track,and decay rates of medium-high frequency vibration components are significantly higher than those of other frequency band vibration components;the 1st order main frequency of ground vibration of embankment and cutting section is mainly dominated by the fundamental frequency f1 of train load,and it gradually moves towards higher frequency direction when train speed increasing;embankment and cutting have a significant impact on the decay law of ground vibration,the decay process of ground vibration of embankment sections with variation of the distance between it and track can be divided into 2 stages,while the decay process of ground vibration of cutting sections can be divided into 3 stages,and there is a more obvious local amplification phenomenon of ground vibration at cutting top;when the distance between track and embankment is≥19.0 m(for cutting section,this distance is≥23.0 m),ground vibration Z direction’s vibration level VL Z is less than 80.0 dB;at the same time,ground vibration under high-speed rail load decreases with increase in embankment height or cutting depth,when embankme

关 键 词：高速铁路 地面振动 路堤 路堑 现场测试 2.5维有限元法 

分 类 号：TU435[建筑科学—岩土工程]