温度力作用下单元板式无砟轨道钢轨横向变形研究

为了研究无砟轨道钢轨横向稳定性,以曲线上单元板式无砟轨道无缝线路为对象,建立包括钢轨、扣件、轨道板和限位部件的无砟轨道钢轨横向变形计算模型,结合不同轨道板长度分析钢轨在温度力作用下的横向变形特性,讨论不同、限位部件弹性和初始弯曲半波长对钢轨横向变形幅值和扣件横向抗力的影响。计算表明,巨大温度力可导致钢轨沿线路纵向产生以轨道板为波长的周期横向不平顺,在小半径曲线地段,应采用刚度较大且塑性变形小的弹性限位垫层材料,重视半波长过小的初始弯曲的治理,并加强对钢轨横向位移和板端扣件使用状态的监测。

Study on Lateral Deformation of Rails in Unit Slab Ballastless Track under Temperature Force

In order to study the rail lateral stability of the ballastless track,CWR unit slab ballastless track on the curve is analyzed to establish a calculation mode for lateral deformation of the rail in ballastless track including rail,fastener,track slab and spacing parts. With reference to different lengths of track slab and the lateral deformation characteristics of the rail under temperature force,this paper addresses the effect of different elasticity of limiting parts and initial bending half-wavelength on lateral deformation amplitude value of the rail and on lateral resistance of fasteners. The calculation shows that periodic transverse irregularities of the rail are caused by significant temperature force in longitudinal direction of the line and along the length of track slab. Therefore,the underlay spacing materials with larger rigidity and smaller plastic deformation shall be used on curved sections of small radius. Treatmentof initial bending with undersized half wavelength shall be emphasized and monitoring of transverse displacement of the rail and the fasteners at the ends of slab shall be reinforced.