无锡地铁运行引起上马墩站振动的现场试验研究

In-situ Experimental Study of Metro Operation-induced Vibration of Shangmadun Station in Wuxi

高频次的地铁运营引发的超量振动对于周边生活和工作造成了明显的负面影响,为了获取地铁诱发振动的传播规律,在无锡地区进行从车站到上盖物业的现场振动实测。在上马墩站搭建整套加速度信号振动测试系统,获取各测点3个方向时域加速度信号,分析结构在时域和频域的基本特征,对地铁运行造成上马墩站振动影响进行评价。研究发现:1)垂向振动在通常情况下明显占优,横向、纵向振动相当; 2)上盖物业振动主要集中为25～50 Hz; 3)车站的Z振级接近规范规定白天限值,超出了夜间限值,有必要采取结构优化或减振措施对地铁运行引起的振动进行控制。

The frequently passing trains would induce excessive vibrations to the surrounding environment. Hence, insitu vibration monitoring is carried out for Shangmadun Metro Station and properties above to learn the propagation rules of metro operation-induced vibration. And then, the three directional accelerations are acquired to analyze their timedomain and frequency-domain characteristics and evaluate the influence of vibration on the station. The results show that:(1) The vertical vibration is significantly more obvious than transverse and horizontal ones.(2) The vibration frequency of properties above the station mainly ranges from 25 Hz to 50 Hz.(3) The Level Z vibration of the station is within daytime limit and exceeds night limit, as a result, structural optimization and vibration reduction measures should be adopted to control the vibration.