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中文摘要：
为深入探索轨道框架对道床非线性纵向阻力的影响,通过建立足尺模型,采用轨道框架法测试道床纵向阻力-位移关系曲线,从轨枕数量、屈服位移、屈服阻力等角度研究轨道框架纵向变形机理,获得轨道框架下道床纵向阻力非线性力学特征。在此基础上,建立轨排结构道床纵向阻力均值计算方法。结果表明：轨道框架道床纵向阻力值明显小于各轨枕阻力之和,且随着轨枕数量与屈服位移取值的增加,差异逐渐增大;当轨道框架沿纵向移动时,道砟颗粒呈现出不规则的运动规律,轨道框架中间位置处颗粒运动的不规则性相对两端较弱,且颗粒位移扩散角较小;轨排结构道床阻力均值计算方法可以较为合理的预估出阻力值的大小,且随着轨枕数量的增加,道床阻力均值趋于稳定。
英文摘要：
To explore the effect of track frame on nonlinear longitudinal resistance of the ballast bed, the longitudinal resistance-displacement curve of the ballast bed was tested using track frame method through the establishment of full-scale model. The longitudinal deformation mechanism of the track frame was analyzed from the perspective of the number of sleepers, yield displacement and yield resistance, to obtain the nonlinear mechanical characteristics of longitudinal resistance. On this basis, the calculation model of the mean value of longitudinal resistance of track frame was established. The results showed that the longitudinal resistance value of the track frame was significantly less than the sum of the resistance of all sleepers. With the increase of the number of sleepers and yield displacement values, the difference increased gradually. Ballast particles exhibited irregular movement with the track frame moving along the longitudinal direction. The irregularity of the motion of ballast particles in the middle of the track position was relatively weaker than that at both ends of the track frame, and the diffusion angle of the particle displacement was relatively smaller. The longitudinal resistance value of the track frame could be reasonably estimated by the calculation method of resistance means. With the increase of the number of sleepers, the mean value of resistance tended to be stable.
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