高架轨道交通列车对周围环境振动影响的试验研究

对北京地铁5号线高架桥上的运行列车引起周围地面振动的影响进行了实测，将测试得到的地面振动加速度数据在时域和频域内进行了分析。得到了以下结论：普通轨枕下的地面横向振级为58-100dB，竖向振级为55-91dB；梯形轨枕下的地面横向振级为62-85dB，竖向振级为60-83dB；地面横向振动随距离的衰减规律表现为先增大后减小，最大值出现在15m处的测点，衰减呈现出一定的波动性；竖向振动的衰减规律总的趋势是随着距离的增大而逐渐减小，但有一个明显的反弹区（本试验中为距离振源15m左右的范围处），且振动越大反弹越明显；梯形轨枕能够对一定频率范围内的振动起到减振效果，但是对另一频率范围的振动反而起到了放大作用，其原因是由于振动频率与梯形轨枕的自振频率产生共振而引起的；高频振动的衰减速度大于低频振动的衰减速度，远振源点的振动主要是由低频的振动引起的。

Test for environment vibration induced by trains on viaduct

Field measurements were carried out at Beijing No.5 Metro Line subjected to moving trains on viaduct to study the ground vibrations.Time-domain and frequency-domain analyses were performed to the measured ground acceleration data.It was found that the ground lateral vibration level during trains running on common tracks is 58-100dB,and the vertical vibration level is 55-91dB;however,the ground lateral vibration level during trains running on ladder tracks is 62-85dB,and the vertical vibration level is 60-83...