论文部分内容阅读
在研究轨道振动荷载的产生机理基础上,归纳出一个能够涵盖速度、线路不平顺、轮重、轨枕对轮载的分散作用等因素在内的轨道荷载解析表达式,以此作为输入施加到土体模型上,利用ANSYS模拟地基土在轨道移动荷载作用下的三维瞬态弹塑性反应。通过计算得到土体不同位置位移和加速度时程曲线,并得出如下结论:荷载刚施加时地面位移会有一个突变,但是随着荷载的移动会达到一个稳定值,并随着水平面内远离轨道,该值逐渐衰减;荷载刚刚施加时加速度会有一个突变值,随着荷载的移动逐渐趋于零。轨道机车速度对竖向方向的位移和加速度影响不大。
On the basis of studying the generation mechanism of orbital vibration load, an analytical expression of orbital load, which can cover the factors of speed, line irregularity, wheel load, and the dispersion of the sleeper on the wheel load, is derived and applied as input to the soil On the body model, the three-dimensional transient elastoplastic response of subsoil under moving orbital load is simulated by ANSYS. The curves of displacement and acceleration at different positions of soil are obtained and the following conclusions are drawn: there is a sudden change in the ground displacement when the load is applied, but it will reach a stable value as the load moves, and as the horizontal plane moves away from the track , The value gradually decays; there is a sudden change in the acceleration just after the load is applied, and gradually becomes zero as the load moves. Rail locomotive speed has little effect on the vertical displacement and acceleration.