摘要
为研究高速铁路桥梁跨度、桩基长度对环境振动特性的影响,文中以京张高速铁路某桥梁段为研究对象开展了现场实测,并基于FLAC3D建立了箱梁-桥墩-桩基三维数值仿真模型。结果表明现场实测振级值均小于80 dB,随距线路中心线距离增加呈指数衰减;数值仿真计算与实测振级曲线较吻合,验证了模型的合理性;随着桥梁跨度的增加,振级逐渐增大,当桥梁跨度为20 m时,减振效果尤为显著;当桩基长度大于15 m时,随着桩基长度的增加,对振动的削弱效果更加显著,在距线路45 m范围内减振效果最为明显。研究可为高速铁路桥梁段减隔振设计提供参数优化依据。
To investigate the effects of high-speed railway bridge span and pile foundation length on environmental vibration characteristics,field measurements were conducted on a section of the Jingzhang high-speed railway bridge.A three-dimensional numerical simulation model of the box girder-pier-pile foundation system was estab⁃lished using FLAC3D software.The results show that the measured vibration levels were all below 80 dB and exhibit⁃ed exponential attenuation with increasing distance from the track centerline.The numerical simulation results agreed well with the measured vibration level curves,validating the accuracy of the model.As the bridge span in⁃creased,the vibration level also increased;when the span was 20 meters,a significant vibration reduction effect was observed.When the pile foundation length exceeded 15 meters,its vibration attenuation effect became more pro⁃nounced,with the most noticeable reduction observed within 45 meters from the track.This study provides a basis for parameter optimization in vibration mitigation design for high-speed railway bridge sections.
作者
董浩
魏春松
王健成
程琴辉
DONG Hao;WEI Chunsong;WANG Jiancheng;CHENG Qinhui(Hebei University of Architecture,Hebei Zhangjiakou 075000,China;China Northeast Architectural Design&Reserch Institute,Shenyang 110001,China)
出处
《低温建筑技术》
2025年第6期40-44,共5页
Low Temperature Architecture Technology
基金
张家口市基础研究专项(2322003A)。
关键词
高速铁路
环境振动
桥梁跨度
轨道结构
减隔振
high-speed railway
environmental vibration
bridge span
track structure
vibration reduction and iso⁃lation
作者简介
董浩(1999-),男,石家庄人,硕士研究生,研究方向:轨道交通环境振动。
