双块式无砟轨道轨枕伤损对轨道结构性能的影响

Influence of Sleeper Damage on Structural Performance of Double⁃block Ballastless Track

为探明双块式无砟轨道轨枕伤损对轨道结构动力响应以及高速列车行车性能的影响,建立考虑局部轨枕伤损的车辆-双块式无砟轨道系统动力学耦合模型,分别对直线地段和曲线地段的轨枕伤损模式、伤损范围等因素进行仿真分析。结果表明:轨枕伤损导致单个扣件锚固性能失效对轮轨相互作用力和行车安全性指标影响较小,而连续3个扣件锚固性能失效使得轮轨垂向力、轮重减载率、钢轨垂向位移与振动加速度显著增加;轨枕挡肩失效对轮轨相互作用力影响不大,主要导致钢轨横向变形和横向振动加速度增大;曲线地段单侧轨枕失效主要对失效一侧的轮轨力产生不利作用,轮轨横向力增幅明显,从而导致脱轨系数增大。为保障高速列车行车安全,双块式无砟轨道轨枕锚固或挡肩连续失效个数不宜超过3个。

To investigate the impact of double-block ballastless track sleeper damage on the dynamic response of the track structure and the performance of high speed trains,a vehicle-double block ballastless track system dynamic coupling model considering local sleeper damage was established.Simulation analysis were conducted on factors such as sleeper damage modes and damage ranges in straight and curved sections.The results show that the failure of single fastener anchoring performance caused by sleeper damage has little impact on the wheel rail interaction force and driving safety indicators,while the failure of three consecutive fastener anchoring performance significantly increases the vertical force of the wheel rail,wheel load reduction rate,rail vertical displacement and vibration acceleration.The failure of the sleeper shoulder has little effect on the wheel rail interaction force,mainly leading to lateral deformation of the rail and an increase in lateral vibration acceleration.The failure of unilateral sleepers in curved sections mainly has an adverse effect on the wheel rail force on the failed side,with a significant increase in the lateral force of the wheel rail,resulting in an increase in the derailment coefficient.To ensure the safety of high speed trains,the number of consecutive failures in the anchorage or shoulder of double-block ballastless track sleepers should not exceed 3.