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为研究轨道交通振动产生地表局部放大现象原因,利用地表落锤试验和半空间位移格林函数解析解,分析了振源位于地面和地下两种情况下单频振动的地表响应传播规律。结果表明:1)当振源位于地面时,单一频率的地表振动响应幅值随距离呈现波浪形衰减,波动间隔与其自身频率相关。地表体波和瑞利波衰减速度不同而引起的振动叠加效应是造成上述现象的主要原因。2)当振源埋置于地下时,单一频率的地表振动响应将在距振源与埋深大致相当的近场处产生一个明显的波峰或波谷,在远场衰减规律与振源位于地面的情况近似。
In order to study the cause of local enlargement of surface caused by rail transit vibration, the surface response of the single frequency vibration was analyzed using surface drop test and half-space Green’s function analytic solution. The results show that: 1) When the vibration source is on the ground, the amplitude of surface vibration response of a single frequency declines with the distance, and the fluctuation interval is related to its own frequency. The superposition effect of vibration caused by the different attenuation of surface bulk wave and Rayleigh wave is the main reason for the above phenomenon. 2) When the vibration source is buried in the ground, the surface vibration response of a single frequency will produce a clear peak or valley in the near field far from the vibration source and depth, and the attenuation law in the far field and the vibration source are on the ground The situation is similar.