This paper centered on the slab ballastless track widely used in China high-speed railway, using ABAQUS finite element software, establishes double-track high-speed railway vehicles-track-roadbed system secondary vertical coupling dynamic finite element model, and systematically analyzes the temporal-spatial distribution of subgrade bed vertical displacement in the situation that China Railways High-speed 3(CRH_3) train run in opposite direction. The result shows that when the distance of two trains running in opposite directions is more than 35m, vertical displacement in middle section of bedding is zero, which means that train load has no effect on the bed in the middle of longitudinal spacing. When the distance decreases from -20m to -120m, the vertical displacement decreases in oscillation type and gradually tends to 0 finally. The vertical displacement peaks at center of single line. There exists an inflection point where vertical displacement significantly decreases at 4.11m away from centerline of double-track subgrade. Bedding bottom vertical displacement transverse distributions along the route tend to be more even and basin-shape. Within the scope of 7.2m from the bedding surface, the increase of vertical displacement along the depth basically decays linearly. In the range of 7.2m to deeper, the attenuation of vertical displacement is relatively slow.
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