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。
The mean temperature of ballast is decreased with increase of its thickness.
碎石体的平均温度随碎石厚度增加而降低。
Such as track datum, ballast thickness, flatness of the track is not qualified, the tower crane swing or skew;
如轨道基准面、道渣厚度、轨道平直度等不合格，塔机运行晃动或歪斜；
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