铁路道床振动的理论模拟与试验研究

Theoretical Simulation and Field Experiment on Vibration of Railway Ballast

铁路道床的振动是引起轨道几何变形和养护维修费用增长的关键因素 ,国内外有关连续散粒体道床的振动分析方法与测量方法至今未得到很好解决。作者在前人研究基础上 ,基于道床锥体受荷假设 ,并引入道床剪切刚度和剪切阻尼的概念 ,建立了分析道床振动的五参数模型 ;在铁路线路上对道床振动进行了现场实测 ,试验结果与理论分析结果相吻合 。

Vibration of railway ballast is a key factor of causing track geometry change an d the increase of track maintenance costs. So far the methods for analyzing and testin g the vibration of granular ballast have not been well developed. In this paper, a five parameter model for analysis of ballast vibration is established on the ba sis of the hypothesis that the transmission of the load from a sleeper to the ba llast approximately coincides with a cone distribution. The concepts of shear st iffness and shear damping of the ballast are introduced in the model to consider the vibrating influence of adjacent ballast mass. A full scale field experim ent is carried out to measure the ballast acceleration. Theoretical simulation results agree well with the test results. Hence the proposed ballast vibration m odel has been validated.