【摘要】 研究目的:轨道板与自密实混凝土层之间的界面离缝是CRTSⅢ型板式无砟轨道常见的伤损之一。本文基于车辆-轨道耦合动力学,建立高速列车-CRTSⅢ型板式无砟轨道空间振动分析模型,通过未离缝工况和板边离缝工况的对比分析,揭示板边离缝对CRTSⅢ型板式无砟轨道结构动力特性的影响规律。研究结论:(1)无砟轨道结构各项动力响应指标随着列车速度、离缝深度的增加而增大,扣件垂向拉力、各部件(轨道板、自密实混凝土层、底座板)动力响应,以及各部件界面相互作用效应的增幅尤为明显;与未离缝工况相比,离缝深度为0.25 m和0.50 m时,扣件垂向拉力增幅分别可达5%和25%,轨道板加速度增幅分别可达30%和70%,底座板加速度增幅分别可达35%和60%;(2)离缝长度贯通板边时,轨道板与自密实混凝土层之间垂向向下相对加速度可达轨道板加速度的2倍以上,显著增加轨道板、自密实混凝土层、底座板之间的拍击作用,加快轨道各部件及其界面的损伤破坏速度;(3)CRTSⅢ型板式无砟轨道养护维修过程中,应严格控制离缝的深度和长度;(4)本研究成果对于指导CRTSⅢ型板式无砟轨道养护维修具有参考价值。更多还原

【Abstract】 Research purposes: The interface bond damage(IBD) between the slab and self-compaction concrete(SCC) is one of the most common damages of CRTS Ⅲ slab track.Based on the theory of vehicle-track coupling dynamics and the structural characteristics of CRTS Ⅲ slab track,a spatial vibration model for train-CRTS Ⅲ slab track interaction was established,and the influence law of IBD between the slab and SCC on the vibrations of CRTS Ⅲslab track was revealed,by comparing the conditions without IBD and those with IBD.Research conclusions:(1) The dynamic responses of CRTS Ⅲ slab track generally increase with the rising of train speed and the depth of IBD,especially for the vertical tension of the fastener,the dynamic responses of the slab,SCC and foundation,as well as the interaction of the interface.Compared with conditions without IBD,the increase amplitude of the vertical tension of the fastener may reach 5% and 25% respectively,the increase amplitude of the slab acceleration may reach 30% and 70% respectively,and the increase amplitude of the foundation acceleration may reach35% and 60% respectively,when the depths of IBD are equal to 0.25 m and 0.50 m respectively.(2) When the bond under the entire edge of the slab is damaged,the relative vertical acceleration between the slab and SCC may exceed2 times larger than the slab acceleration,and the patting between the slab,SCC,and foundation may increase greatly,which may lead to a faster damage of each part and the corresponding interface of CRTS Ⅲ slab track.(3) The depth and length of IBD should be strictly controlled during the maintenance of CRTS Ⅲ slab track.(4) The research results can provide useful references for the maintenance of CRTS Ⅲ slab track.更多还原