地铁沿线建筑物室内振动与噪声特性测试与分析

随着城市轨道交通的快速发展,地铁运行时产生的振动所引起沿线建筑物室内振动与二次结构噪声问题引起人们的广泛关注。基于某城市轨道交通沿线6层居民楼1楼现场测试,对不同扣件工况下地铁沿线敏感建筑物的室内振动与二次结构噪声问题进行测试与分析。研究表明:地铁沿线建筑物室内各振动、噪声测点峰值频率基本一致,在扣件A工况下峰值频率约为63 Hz,替换为刚度较低的扣件B后,峰值频率在40 Hz~50 Hz左右;采用刚度较小的扣件有利于室内振动与二次结构噪声的降低;虽然所测得的不同测点峰值频率一致,但振级和声压级大小有所不同,基本呈现出振级与声压级随着与地铁线路距离的增加而减小的规律。

Measurement and Analysis of Indoor Vibration and Noise Characteristics of Buildings near the Subway

With the rapid development of urban rail transit,people pay more and more attention to the indoor vibration and secondary structure noise of buildings near subways.Based on the field test of the first floor of a six-story residential building near an urban rail transit line,the indoor vibration and secondary structure noise of sensitive buildings near the subway line with different fasteners were tested and analyzed.The research shows that the peak frequencies of the indoor vibration and noise at different measurement points of the buildings along the subway are basically the same.Under the condition of fastener A,the peak frequency is about 63 Hz.After it is replaced by fastener B with lower stiffness,the peak frequency is about 40 Hz-50 Hz.The fastener with smaller rigidity is favorable to the reduction of indoor vibration and secondary structure noise.Although the peak frequencies at different measurement points are the same,the vibration level and sound pressure level are different.The vibration level and sound pressure level decrease with the increase of distance away from metro line.