轨道结构参数对地铁引起地面环境振动特性的影响分析

摘要

The effect of track parameters on ground-vibration characteristics induced by metro-train in the condi-tion of rail roughness was studied by FEM and on-site experiments.The results show that the ground vibration from metro train mainly is caused by roughness with wavelength of 0.3 -1.0 m.The decreasing fastener stiff-ness and increasing the mass of sleeper can reduce the ground vibration level in the range of 50-100 Hz and 30-100 Hz respectively.The decreasing supporting stiffness of slab can effectively reduce the ground vibration level in the range of 20-100 Hz with about 13.5 dB,but will cause ground-vibration increase in certain fre-quency.%分别采用有限元和现场试验方法，研究了在短波不平顺条件下，轨道结构参数变化对地铁列车引起地面环境振动特性的影响。结果表明：地铁列车引起的地面环境振动总体上由波长为0.3～1.0m的短波不平顺所引起，减小扣件刚度和增大轨枕质量可以分别在50～100 Hz和30～100 Hz范围内减小地面振动水平，减小道床支承刚度可在20～100 Hz范围内有效减小地面环境振动水平约13.5 dB，但会导致地面环境振动水平在某些频率上出现增大。