地铁列车-宽枕板式减振轨道系统竖向振动分析及减振效果评价

Analysis of Vertical Vibration of Metro Train-Wide Sleeper Damping Track System and Evaluation of Vibration Damping Effect

针对地铁轨道结构设计中不可避免地面临活动断裂带与轨道减振降噪地段重合的情形,建立了列车-宽枕板式减振轨道系统竖向振动分析模型,探讨了不同减振轨道结构的动力特性及减振性能。结果表明:以压缩型减振扣件替换普通扣件的轨道结构的减振效果值可达5.24 dB,满足中等减振轨道的需求,同时满足行车要求;宽枕板下黏贴减振垫可适用于高等减振地段,建议高等减振地段减振垫刚度≥0.030 N/mm^(3);道床底部铺设减振垫可适用于特殊减振地段,建议特殊减振地段减振垫刚度取值可放宽至0.018 N/mm^(3)。

Targeting that metro track structure design is inevitably faced with the situation where the active fault zone coincided with the track vibration reduction and noise reduction section,a vertical vibration analysis model of the train-wide sleeper damping track system is established to discuss the dynamic characteristics and vibration damping effect of different damping tracks.Results show that:the compression damping fastener can replace ordinary fasteners to achieve a damping effect value of 5.24 dB,which can meet the requirements of mode-rate vibration reduction and satisfy the driving requirements at the same time;adhesive damping pads under wide sleepers can be applied to higher vibration damping areas,suggesting that the stiffness of damping pads in high vibration damping areas is k≥0.030 N/mm;vibration damping pads at the bottom of the track bed can be applied to special vibration damping areas.It is suggested that the stiffness of the damping pad in special vibration damping area can be relaxed to 0.018 N/mm^(3).