扣件刚度对轨道及饱和地基振动响应的影响

The Influence of Rail Fastenings Stiffness on Track-Ground System Vibration

研究目的:修建于我国沿海软土地区的铁路受地基特性的影响在列车高速运行时会产生较大振动,控制列车运行引起的轨道系统及地基振动响应能够有效提高列车的平稳性、舒适性,并减少对周边环境的影响。本文采用轨道系统-饱和地基耦合模型研究饱和地基上轨道系统的振动特性,探讨扣件刚度的选取对轨道振动响应的影响。研究结论:(1)扣件刚度对钢轨位移和加速度响应均有明显影响;(2)增大扣件刚度能够有效减少钢轨的位移响应;(3)增大扣件刚度能够降低低速列车的钢轨加速度响应,但高速列车引起的钢轨加速度响应随扣件刚度的增大有所增加;(4)本研究结论可为认识交通活动中振动现象的本质、解决饱和软土地区列车和环境振动问题、优化轨道系统设计和施工提供理论指导。

Research purposes： The high-speed train could produce significant vibrations to railways built on saturated soft clay foundation in coastal area. The track system and ground vibration response could improve the comfort of trains and reduce the influence on the surrounding environment. This paper studied the vibration characteristics of track system on saturated subgrade by using the coupling model of the track system-saturated foundation,and discussed the effect of rail fastenings stiffness on track vibration response.Research conclusions：(1） The displacement and acceleration responses were considerably affected by the fastenings stiffness.(2） Increasing the fastenings stiffness can effectively control the rail displacement response.(3） Increasing the fastenings stiffness can also reduce the acceleration responses due to low-speed trains,but the rail acceleration responses caused by high-speed train increases with the increase of fastenings stiffness.(4） The results could offer guidance for understanding the essence of the vibration phenomenon in traffic activities and provide theoretical guidance for reducing the vehicle vibration and optimizing track design and construction.