北京地铁列车运行引起建筑室内振动污染特征与评价

以分频最大振级(VL max)和最大Z振级(VL Z max)作为评价量,结合相关标准,监测与评价北京市地铁列车运行引起的临近建筑室内振动。结果表明:北京市2条地铁线路的振动特征频率分别为25 Hz、31.5 Hz、40 Hz和63 Hz,以40 Hz为主;特征频率上振动加速度级(VAL)增量明显;VL max、VL Z max的大小既与频率计权因子不统一有关,也与地铁对建筑室内振动的影响程度及振动能量在不同中心频率上的分布差异直接相关;地铁隧道埋深较水平距离对地铁振动衰减作用显著;地铁振动监测与评价的频率范围可统一为对人体影响较大的1 Hz^80 Hz,并统一频率计权因子。

Pollution Characteristics and Evaluation of Subway Induced Indoor Ground borne Vibration in Beijing

According to relevant standards,using frequency division maximum vibration level(VL max)and maximum z-vibration level(VL Z max)as evaluation indexes,the indoor ground-borne vibration induced by subway in the nearby buildings in Beijing was monitored and evaluated.The results showed that the characteristics frequency of indoor ground-borne vibration of two subway lines in Beijing were 25 Hz,31.5 Hz,40 Hz and 63 Hz respectively,40 Hz was the main frequency.The vibration acceleration level(VAL)increased obviously.The size of VL max and VL Z max were not only related to non-uniform frequency weight factors,but also the influence of subway on indoor vibration and the distribution difference of vibration energy in different center frequencies.Compared with horizontal distance,the burial depth of subway tunnel had a significant effect on vibration attenuation.The frequency range should be unified into 1 Hz^80 Hz which greatly affected human body in vibration monitoring and evaluation,and the frequency weight factors should be unified.