长大坡道上梯形轨道稳定性研究

根据梯形轨道的结构特点,建立梯形轨道在长大坡道上的叠合梁计算模型。长大坡道上梯形轨道在制动力作用下其沿线路方向的荷载增加,垂向荷载相应减少,对梯形轨道纵向稳定性而言,是不利的。分析长大坡道上梯形轨道的纵向力传递机理,扣件的纵向阻力、凸挡台的抗剪强度、凸挡台侧壁缓冲垫的刚度是梯形轨道纵向力传递的控制因素。采取控制变量的方法,研究三者参数变化对轨道的内力和位移的影响。结果表明:在外在荷载作用下,长大坡道上梯形轨道钢轨爬行大于水平线路,凸挡台抗剪强度满足要求,并提供不同扣件纵向阻力和缓冲垫刚度对结构的影响。

Stability Study of Ladder Track on Long Steep Grade

According to the structural characteristics of the ladder track,a composite beam model of the ladder track on long steep grade is established. Under the braking force,the load along the track line is increased and the vertical load is reduced accordingly,which is disadvantageous for the longitudinal stability of the ladder track. The analysis of the transfer mechanism of the longitudinal load indicates that the longitudinal resistance of fasteners,the shear strength of convex block and the stiffness of cushion in the sidewall of convex block are the controlling factors in the transfer of the longitudinal load of the ladder track. With the method of controlling a variable,the influence of internal forces and the displacement of the ladder track caused by diversification of the three parameters are studied. The results show that the rail creep of the ladder track on long steep grade is greater than that on the level line and the shear strength of convex block meets the mandates. The influence of longitudinal resistance of fasteners and stiffness of cushion on the structure is addressed.