With the thickness of ballast increasing, the subgrade dynamic stress reduces linearly, but dynamic displacement and acceleration have a negligible change.
道床厚度增加，路基动应力线性减少，但路基动位移和加速度变化不明显。
With the thickness of ballast increasing, the subgrade dynamic stress reduces linearly, but dynamic displacement and acceleration have a negligible change.
道床厚度增加，路基动应力线性减少，但路基动位移和加速度变化不明显。
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