重载铁路桥墩基础冲刷对车-轨-桥系统动力响应影响  

Influence of Pier Foundation Scour on the Dynamic Response of Vehicle-track-bridge Systems in Heavy Haul Tracks

作　　者：陈松[1,2] 龚凯[2] 黄群杰[1] 梁展维[2] 王成 余翠英 CHEN Song;GONG Kai;HUANG Qunjie;LIANG Zhanwei;WANG Cheng;YU Cuiying(Department of Architecture and Civil Engineering,Jiangxi V&T College of Communications,Nanchang 330013,China;Engineering Research Center of Railway Environmental Vibration and Noise,Ministry of Education,East China Jiaotong University,Nanchang 330013,China;School of Science,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]江西交通职业技术学院建筑工程系,南昌330013 [2]华东交通大学铁路环境振动与噪声教育部工程研究中心,南昌330013 [3]华东交通大学理学院,南昌330013

出　　处：《噪声与振动控制》2022年第5期29-34,共6页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(52068028);国家自然科学基金委员会与神华集团有限公司联合资助项目(U1261113)。

摘　　要：为分析基础冲刷对车-轨-桥系统动力响应的影响规律,基于货物列车-轨道-桥梁系统(简称“FTTB系统”)空间振动计算模型,采用等效刚度模拟基础冲刷,建立基础冲刷条件下的FTTB系统空间振动计算模型;根据《铁路桥涵地基和基础设计规范》中的m法,计算不同冲刷深度下的等效刚度并编制计算软件;将等效刚度输入模型,计算并分析不同车速下基础冲刷对FTTB系统动力响应影响。研究结果表明:冲刷对基础横向等效刚度的影响大于竖向刚度;车速≥70 km/h且冲刷外露至桩基时轮重减载幅度增大,建议适当减速;桩基外露2 m时对梁体跨中横向振幅及墩顶横向振幅影响显著,建议对桥墩基础进行加固。上述结论可为重载铁路桥墩基础的养护维修提供参考。The influence of foundation scour on dynamic responses of vehicle-track-bridge systems in heavy haul tracks is analyzed. The spatial vibration calculation model of a freight train-track-bridge(FTTB) system under the foundation scour condition is established using equivalent stiffness to simulate the foundation scouring. According to the m method of the code for design of subsoil and foundation of railway bridge and culvert, the equivalent stiffness under different scouring depths is calculated. The calculation program for analyzing the dynamic response of the FTTB system is written and compiled with the equivalent stiffness as the input. Then, the influence of foundation scour on the dynamic response of the FTTB system at different train speeds is calculated and analyzed. Results show that the effect of foundation scour on lateral equivalent stiffness is greater than that on vertical stiffness. When the train speed is great than or equal to 70 km/h and the scour is exposed to the pile foundation, the vertical wheel load decreases. Thus, it is suggested in this case to slow down the train speed appropriately. At the same time, when the pile foundation is exposed by 2 m, the amplitudes of transverse vibration of the beam and the pier top are significantly larger, which implies that the reinforcing of the pier foundation is necessary. The above conclusions can provide a reference for the maintenance and repair of pier foundation of heavy haul tracks.

关 键 词：振动与波 铁道工程 重载铁路桥梁 基础冲刷 等效刚度 动力响应 

分 类 号：U213.2[交通运输工程—道路与铁道工程]