重载铁路引起地面振动的试验与分析

Testing and Analysis of Ground Vibration Induced by Heavy-haul Railway Operation

对重载铁路沿线在货物列车通过时引起的地面振动进行现场试验,测试了距离铁路7.5 m、15 m、30 m、60m、90 m处的地面横向和垂向振动速度,分析了振动速度的幅值和频率特性,得到货物列车引起地面振动的振源特性、传播特性以及轴重、列车速度与振动的关系。分析表明:货物列车引起的地面振动在5 Hz^10 Hz的范围内峰值明显;随着距离的增加,高频成分的衰减比低频更快。地面峰值振动速度(PPV)随着距离的增加呈幂函数衰减,在7.5m^15 m距离内振动峰值衰减显著。在7.5 m处横向和垂向峰值振动速度数值接近;在15 m及更远距离处,横向振动速度衰减比垂向振动速度快。地面横向、垂向峰值振动速度(PPV)随行车速度、列车轴重提高呈增大趋势。

Field test of ground vibration induced by heavy-haul railway operation was conducted. The transverse andvertical velocities of ground vibration at the distance of 7.5 m, 15 m, 30 m, 60 m, 90 m away from the rail were measured respectively.The amplitude and frequency characteristics of the vibration velocity were analyzed, and the vibration sourcecharacteristics, propagation characteristics and attenuation laws of the ground vibration induced by the heavy-haul train wereobtained. The relation among the axle load, velocity of the train and the vibration was derived. Results show that the vibrationcomponents caused by the train have obvious peaks at each measuring point in 5-10 Hz frequency range. With the distancefrom the rail to the measurement point increasing, high frequency components of transverse and vertical velocities decayfaster than the low frequency components. The Peak Particle Velocity （PPV） of the ground decays as a power law. At thedistances of 7.5-15 m, the PPV decays significantly. At the distance of 7.5 m, the PPV values of transverse and vertical vibrationsare close to each other. At the distances beyond 15 m,The PPV of the transverse velocity decays faster than that of thevertical velocity. Vibration velocity increases as the train speed and axle load increasing.