%0 Journal Article %T 重载列车作用下CRTSⅢ型板式轨道结构力学特性试验研究<br>Experimental study on the mechanical characteristics of CRTSⅢ slab ballastless track under heavy-haul train %A 曾志平 %A %A %A 何贤丰 %A 余志武 %A %A 魏炜< %A br> %A ZENG Zhiping %A %A %A HE Xianfeng %A YU Zhiwu %A %A WEI Wei %J 铁道科学与工程学报 %D 2018 %X 通过建立CRTSⅢ型板式无砟轨道结构1:1足尺试验模型，开展30 t轴重列车作用下轨道结构力学特性试验，获得800万次疲劳试验后轨道结构力学性能演化特征。研究结果表明：疲劳荷载作用下，CRTSⅢ型板式无砟轨道各层动力响应基本呈逐渐增加之势；800万次疲劳荷载作用后，扣件竖向动、静刚度分别增加24.77%和23.94%，竖向动静刚度比变化不明显；隔离层竖向动、静刚度分别增加152.27%和136.11%，动静刚度比减小6.4%；底座竖向加速度最大值增加67.4%；底座混凝土板中处拉、压应力最大值分别增加55.6%和26.3%。研究成果对于开展重载铁路CRTSⅢ型板式无砟轨道结构研究具有参考价值。<br>Heavy haul railway is the development direction of international railway freight transportation. In this paper, the 1:1 full scale test model of CRTSⅢ slab ballastless track structure was established, and experiment study on mechanical characteristics of the track structure under 30-ton axle load was carried out. The mechanical characteristics of the track structure were obtained after 8 million fatigue load tests. The results show that: The dynamic responses of different layers in CRTS Ⅲ slab ballastless track structure increase gradually under the action of fatigue load. After 8 million times of fatigue load tests, the vertical dynamic stiffness and static stiffness of rail fastener increases 24.77% and 23.94% respectively, and the change of vertical dynamic and static stiffness ratio is not obvious, meanwhile, the vertical dynamic and static stiffness of isolation layer increases 152.27% and 136.11% respectively, and the vertical dynamic and static stiffness ratio reduces 6.4%, moreover, the maximum of vertical acceleration of concrete base increases 67.4% and the maximum tensile stress and compressive stress in the middle of the concrete base increases 55.6% and 26.3% respectively. The research results would guide the research of CRTSⅢ slab ballastless track structure in heavy-haul railway %K 重载列车 %K CRTSⅢ型板式无砟轨道 %K 试验 %K 力学特性< %K br> %K heavy-haul train %K CRTSⅢ slab ballastless track %K experiment %K mechanical characteristics %U http://www.jrse.cn/paper/paperView.aspx?id=paper_317620