高速铁路隔振沟隔振效果的现场测试与分析

In-situ Test and Analysis of Isolation Effect of Vibration Isolating Trench for High Speed Railways

对沪宁城际铁路高架桥段旁一条为农业灌溉而挖的沟渠在CRH动车组运行时引起的地面振动隔振效果进行了测试与分析。结果表明:随着列车车速的降低,引起的地面竖向振动速度峰值变小、地面竖向振动主频变高;沟渠对地面振动具有低通滤波作用;车速越慢,隔振效果越好,但沟前地面振动变大的现象也越明显;当沟的长度远大于列车长度时,列车车厢数量对沟的隔振效果影响不大。建议修建铁路时,加强与当地居民及农业部门的协调,对沟的长度、深度、宽度以及离轨道的距离进行合理的设计,使沟渠除了满足农业灌溉的需要外,也能起到很好的隔振效果。

One trench for agricultural irrigation next to the Hu-Ning Intercity Railway viaduct section were tested and analyzed in order to achieve the effect of ground vibration isolation when CRH trains run on.The result shows that with decrease of train speed,the peak value of ground vibration velocity decreases and the main frequency of ground vibration heightens.The trench has lowpass filtering effect on ground surface vibration.The slower the train speed,the more apparent the effect of isolation,but the phenomenon that ground surface vibration increases before trench is more remarkable.When the length of trench is much greater than the length of train,the number of carriages has little effect on vibration isolation effect of the trench.When the railways are built,the department concerned should facilitate the coordination with nearby residents and department of agriculture,and the trench＇s length,depth,breadth and the distance to railway should be designed reasonably.And then the trench in addition to meet the need of irrigation,but also has marked effect on vibration isolation.