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三 分析 1.轨枕的位移量和道床横向阻力 可以认为,达到上述道床横向阻力最终值所必须的轨枕位移量是与道床形状和轨枕尺寸有关。 即对道床(1)和(3)来说,道床阻力就是轨枕表面与道床间的摩擦力。所以,仅以较小的位移就达到了道床阻力的最终值。而对道床(2)和(4)来说,除了上述摩擦阻力外,还受到相当于轨枕端面道床被动土压阻力
Three Analysis 1. Sleeper displacement and horizontal resistance of the track bed It can be considered that the amount of rail displacement required to achieve the above ultimate value of the horizontal resistance of the track bed is related to the shape of the track bed and the size of the sleeper. That is, for the ballast beds (1) and (3), the ballast resistance is the friction between the sleeper surface and the ballast bed. Therefore, the final value of bed resistance is reached with only a small displacement. On the track bed (2) and (4), in addition to the above frictional resistance, but also by the equivalent of rail pillow rail bed passive earth pressure resistance