列车对周围地面及建筑物振动影响的试验研究

Experimental Study of Train-induced Vibrations of Ground and Nearby Buildings

通过铁路桥梁和铁路线路附近的两次现场试验,研究列车对周围地面和邻近建筑物的振动影响。实验结果表明,无论是作为桥墩的点振源,还是作为线路的线振源,铁路附近地面环境和建筑物地板的振动均随列车速度的提高而增大,随距线路的距离增加而减小,但在距线路一定的距离存在着一个振动放大区。对于多层建筑物,较高楼层的振动大,轴重大的列车引起的振动较大;实测铁路附近的楼房地板振动很大,已经超过了我国环境振动控制标准的规定。

In this paper, the vibrations of ground and nearby buildings induced by moving trains are studied through field experiments. The experiments are carried out at a bridge site and two buildings near railway tracks which are regarded as the point and line vibration sources. The measured results show that the vibration levels of the environmental ground and building floors increase with the train speed, while attenuating with the distance to the railway tracks; there exists a vibration amplifying zone in a certain distance to the railway track. For multi-story buildings, higher floors vibrate more strongly than lower ones; heavier trains induce greater vibration than lighter trains. The measured vibration levels of buildings near railway tracks are so big that they have greatly exceeded the allowances given by the Chinese Code for Urban Environmental Vibrations.