城市地铁地下轨道振动对周边建筑的影响分析

结合实际地铁运营期间普通整体道床、纵向轨枕减振道床的钢轨、道床、隧道壁监测点及周边建筑物在轨道不同距离监测点的典型时域波形图和频率域谱图,首先依据实际监测数据计算普通整体道床轨道与纵向轨枕轨道之间各个监测点的铅垂向计权网络最大Z振级(VLZmax),分析普通整体道床轨道与纵向轨枕轨道之间钢轨、道床、隧道壁各测点的振动最大振级差值,充分阐述纵向轨枕轨道的减震效果;然后对普通整体道床周边建筑物不同监测点的最大Z振级进行计算,确定最大Z振级范围,判定其值是否已经超过规范要求及与地铁运营轨道振动的相关性,提出减震措施建议;最后对采用纵向轨枕减振道床减震措施处理后的周边建筑物监测点进行二次监测,得到的最大Z振级监测数据均在规范允许范围以内,认识到轨枕减振道床减震技术对于易发生共振的临近建筑物减震效果最为明显。

Analysis of Influence of Underground Rail Vibration on Surrounding Buildings in Urban Subway

Combined with the typical time domain waveform and frequency domain spectrum of the rail,track bed,tunnel wall monitoring points of the common monolithic track bed and longitudinal sleeper damping track bed and the monitoring points of the surrounding buildings at different distances of the track during the actual metro operation,firstly we calculate the maximum Z-vibration level(VLZmax)of the vertical weighted network of each monitoring point between the common monorail bed track and the longitudinal sleeper track based on the actual monitoring data,and analyze the measuring points of the rail,track bed and tunnel wall between the common monolithic track and the longitudinal sleeper track and also fully expoundthe damping effect of the longitudinal sleeper track.Secondly 5 we calculate the maximum Z vibration level of different monitoring points of the buildings around the ordinary integrated track bed to determine the maximum Z vibration level range,and whether the value has exceeded the specification requirements,and propose the relevant damping measures.Finally,we monitor the surrounding building monitoring points after the longitudinal sleeper damping track bed damping measures are processed?and the maximum Z-magnitude monitoring data obtained are within the allowable range of the specification.It is obvious that the sleeper damping track bed damping technology has the most shock absorption effect on buildings that are prone to resonance.