摘要
以重庆某地铁上盖开发工程为背景,基于车辆-轨道耦合动力学理论,建立了地铁列车-轨道相互作用力学模型及包含隧道与土体的有限元模型。结合现场实测数据,分析了地铁运营引发TOD建筑群的振动特性(主频集中在63Hz)及二次噪声传播规律。研究结果表明,租赁区因邻近线路,其振动水平超出国家标准限值。为此提出了减振降噪措施:将车辆段库内及咽喉区普通扣件替换为弹性扣件;在咽喉区上盖办公楼区设置弹簧隔振支座;在租赁住宅侧墙增设隔振垫。实施后各功能区振动及二次噪声指标均降至国家标准范围内。其中,最大Z振级衰减达4~8.9dB(A),最大声压级衰减达6.2~9.6dB(A),证明项目采取的减隔振措施对振动和结构二次噪声具有良好的控制效果。
Taking the development project over a subway line in Chongqing as the background,this study established a mechanical model of train-track interaction and a finite element model incorporating tunnels and soil based on the vehicle-track coupled dynamics theory.By combining field measurement data,the vibration characteristics(with a dominant frequency concentrated at 63Hz)and secondary noise propagation patterns in the TOD building cluster caused by subway operations were analyzed.The findings indicate that the vibration levels in the leasing area,due to its proximity to the tracks,exceeded national standard limits.To address this,vibration and noise reduction measures were proposed that replacing conventional fastenings with elastic fastenings in the depot and throat areas,installing spring vibration isolation bearings in the office building area above the throat section,and adding vibration isolation pads to the side walls of leased residential units.After implementation,the vibration and secondary noise indicators in all functional zones fell within the national standard range.The maximum Z-weighted vibration level attenuation reached 4~8.9dB(A),while the maximum sound pressure level attenuation achieved 6.2~9.6dB(A),demonstrating that the vibration and secondary noise mitigation measures adopted in the project effectively controlled both vibration and structural secondary noise.
作者
王良山
WANG Liangshan(The Sixth Engineering Co.,Ltd.of China Railway 20th Bureau Group Co.,Ltd.,Xi’an,Shaanxi 710032,China)
出处
《施工技术(中英文)》
2025年第22期6-11,60,共7页
Construction Technology
基金
陕西省重点研发计划(2024SF-YBXM-650)。
关键词
地铁
TOD
振动
监测
二次噪声
减隔振
subways
transit-oriented development(TOD)
vibration
monitoring
secondary noise
vibration reduction and isolation
