The vertical load did not help to reduce the lateral displacement at the pile top anymore when it was applied after the lateral load.
先施加水平荷载再施加竖向荷载时，竖向荷载不再起到减小水平荷载作用下桩顶侧移的作用。
The weaker the soil, the greater the effect of the vertical load on the lateral displacement at the pile top.
在土质条件较好的情况下竖向荷载对桩顶侧移的有利影响不如土质条件较差时那样明显。
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