High-speed Railway 论文推荐|翘曲变形下CRTSⅢ型板式无砟轨道层间动态接触关系

翘曲变形下CRTSⅢ型板式无砟轨道层间动态接触关系

Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track

论文二维码：

https://www.sciencedirect.com/science/article/pii/S2949867824000540

赵磊，中国铁道科学研究院集团有限公司铁道建筑研究所

赵国堂，中国国家铁路集团有限公司

杨国涛，中国国家铁路集团有限公司

金浩，东南大学交通学院

李晨曦，北京交通大学交通运输学院

L.zhao, G.T.Zhao, G.T.Yang,et al., Study on the dynamic contact relationship between layers under temperature gradients in CRTSⅢ ballastless track, High-speed Railway,2024，2（1）：133-142

中文摘要：

大温差地区CRTSⅢ型板式无砟轨道因白天受日照等影响轨道板内温度分布极不均匀，导致轨道板翘曲变形，诱发轨面不平顺，增加高速列车轮轨冲击响应，加速轨道结构损伤，有必要对高速行车过程中复合板与底座层间动态接触关系进行研究。结果表明：1）温度梯度影响下，复合板呈椭球形变形趋势，正温度梯度时板中部向上鼓起，四角支承，负温度梯度时板四角翘起，板中支承。2）温度梯度会导致复合板与底座间产生不同程度离缝，板下接触面积减小，高速行车时层间接触面积逐渐增加，但离缝不会完全闭合。3）温度梯度对轨道结构垂向振动加速度影响较小，对垂向位移的影响较大，温度梯度越大，轨道垂向位移越大，正温度梯度增加板中处垂向位移逐渐增加，负温度梯度增加板端处垂向位移增加。4）正温度梯度下侧边位置处自密实混凝土受力显著增加，正温度梯度由0增加至90℃·m^-1自密实混凝土竖向应力增加了2.7倍。

图1 无砟轨道周期性不平顺模型

图2 转向架位于板上不同位置时层间压力峰值

图3 板下接触面积时程曲线

图4 板下最大离缝量对比

图5 轨道板垂向位移对比

图6 自密实混凝土竖向应力时程对比

图7 钢轨振动加速度时程对比

图8 轨道板振动加速度时程对比

图9 转向架位于板上不同位置处层间压力分布图

创新点：

In areas with large temperature differences, the uneven distribution of temperatures in the CRTS III ballastless track slab due to daytime sunlight can cause warpage deformation, leading to periodic rail irregularities that increase the wheel-rail impact of high-speed vehicles and accelerate track structure damage. Therefore, it is necessary to study the dynamic contact relationship between the composite slab and the base plate during vehicle running. The results of the study show that: 1) Under the influence of temperature gradients, the composite slab tends to deform elliptically. With a positive temperature gradient, the middle part of the track slab bulges upward, causing the slab to be supported by its four corners. Conversely, with a negative temperature gradient, the four corners of the track slab bulge upward, resulting in the slab being supported by its center. 2) Temperature gradients can lead to separation between the composite slab and the base plate, reducing the contact area between layers. During vehicle running, the contact area between layers gradually increases, but the separation cannot be completely closed. 3) The temperature gradient significantly affects the vertical displacement of the track. The vertical displacement in the middle of the slab increases with a positive temperature gradient. In contrast, the vertical displacement at the ends of the slab increases with a negative temperature gradient. 4) The stress of self-compacting concrete at the side position significantly increases under a positive temperature gradient, with the vertical stress increasing by 2.7 times when the temperature gradient increases from 0 to 90 ℃/m.