【摘要】 为了评价提速线路路桥过渡段对于轨道结构动力响应的改善程度,本文对京九线过渡段的设计及轨道动力响应测试进行了研究,过渡段的设计采用20m的级配碎石填筑,轨道动力响应测试参数为钢轨垂直力、钢轨加速度、轨枕加速度。测试表明,当路桥连接处设了轨道过渡段时,列车从低刚度轨道到高刚度轨道时,钢轨垂直力、钢轨加速度、轨枕加速度是由小逐渐增大的,没有突变;当列车从高刚度轨道到低刚度轨道时,钢轨垂直力、钢轨加速度、轨枕加速度是由大逐渐减小,没有突变。当路桥连接处没有设置轨道过渡段时,列车从高刚度轨道到低刚度轨道运行时,其动力响应突然减小,有突变。通过对设有过渡段及没有设过渡段的路桥连接处实测分析可知,当列车速度小于200 km／h时,采用长度为20 m的级配碎石填筑轨道过渡段,对减小过渡段轨道动力响应非常有利。更多还原

【Abstract】 In order to evaluate the improvement level of track structure dynamic response by the transition zone between railraod and bridge of speed-raise railway, the research is made on the design and test of track dynamic response of transition zone of Beijing-Kowloon Line in this paper. The transition zone was filled by 20m gradation crushed stones and the test parameters to track dynamic response were rail vertical force, rail acceleration and tie acceleration. The test shows if there is a transition zone at junction location between railroad and bridge, when train runs from the rail of low rigidity to the rail of high rigidity, the rail vertical force, rail acceleration and tie acceleration gradually change from small to large without sudden change. When train runs from the rail of high rigidity to the rail of low rigidity, the rail vertical force, rail acceleration and tie acceleration gradually change from large to small. If there is no transition zone at junction location between railroad and bridge, when train runs from the rail of high rigidity to the rail of low rigidity, the dynamic response becomes small suddenly with sudden change. It is known from the analysis of the tests to the junction location with transition zone and without transition zone, when the train’s speed is less than 200km/h, the transition zone filled by 20m graduation crushed stones can assist reducing track dynamic response of transition zone.更多还原