地铁引起的结构振动与噪声及其相关性分析

Measurement and Correlation Analysis of Ground-borne Vibration and Noise Induced by Underground Railway

针对上海市轨道交通地下线沿线居民噪声与振动投诉较为集中的22个敏感点,对地铁列车运行时产生的结构振动与结构噪声进行了实测,以分析地铁引起的结构振动与结构噪声影响情况,并将测试所得的最大振级与最大声级进行相关性分析。从实测及分析可见,各测点结构振动最大振级在55dB^92dB左右,振动频率主要集中在40Hz^120Hz左右;不同线路的二次结构噪声最大值差异较大,在25~300Hz的中低频段范围内增量较大;结构振动及结构噪声在线路两侧15m范围内衰减较快;结构噪声是由结构振动激发而产生的,两者之间存在一定的相关性,但因建筑结构的不同等因素影响,相关性存在很大差异。

The ground-borne vibration and noise induced by underground railway of 22 sensitive residential points was measured,where there is much complaint about the vibration and noise,so as to analyze the influence and correlation of underground railway＇s ground-borne vibration and noise.According to the measured results and subsequent analysis,1）the maximum ground-borne vibration level（VL Zmax）of above measuring points is about 55dB^92dB,the frequency is concentrated between 40Hz^120Hz;2）the maximum ground-borne noise level（L Amax）varies among different metro lines,and the increment is bigger within the range from 25Hz to 300Hz;3）the attenuation of the ground-borne vibration and noise is fast within the bounds of 15 meters;4）although the ground-borne noise is induced by the vibration,the correlation between vibration and noise is not so good,and the correlation coefficient changes with the difference of building structure,etc.