无砟道岔结构横移影响分析及病害整治

Analysis of Lateral Offset of Ballastless Turnout Structure and Its Disease Treatment

无砟道岔结构横移是高速铁路轨道出现的典型病害之一,导致了多处列车限速运行。本文以客运专线18号可动心轨道岔为例,运用多体动力学软件建立车辆-道岔耦合动力学模型,分析了无砟道岔结构横移量对车辆动力特性的影响,并对横移病害整治方法进行了研究。结果表明:无砟道岔结构横移会产生方向不平顺,导致轮轨横向力、脱轨系数及车体横向振动加速度大幅增加;直、逆向过岔时,辙叉区横移对车辆动力特性的影响大于转辙器部分,而转辙器部分横移会持续影响车体通过辙叉区的横向加速度;采用抬升推移法对岔区无砟轨道结构进行调整时,底座板与基床表层之间的黏结力对顶推力的影响大于轨道结构刚度。

The lateral offset of the ballastless turnout structure is one of the typical diseases in the high speed railway track, which leads to several speed limit operation of the trains. Taking No. 18 movable frog turnout of passenger dedicated railway as an example, the vehicle-turnout coupling dynamic model was set up by using multi-body dynamics software, the influence of ballasdess turnout structure lateral offset on vehicle dynamic characteristics was analyzed and the disease treatments for lateral offset were studied in this paper. The results show that lateral offset of ballastless turnout structure will produce track direction irregularity resulting in a significant increase of wheel rail lateral force, derailment coefficient and lateral vibration acceleration of train body, the influence of the frog lateral offset on the dynamic characteristics of vehicle is greater than the influence of the switch when the trains pass through the turnout directly and reversely, switch lateral offset has a continuous influence on the lateral acceleration when the train passes through the frog zone, the bonding force between base plate and surface of foundation bed has more effect on the jacking force than the influence of the track structure stiffness when the lifting and shifting method was used to adjust the ballasfless track structure of turnout zone.