The characteristics of negative skin friction (NSF) with working load on pile top were analyzed.
分析了在桩顶荷载作用下的负摩阻力特性。
When the load on pile top is small, the later friction undertake mainly the load. With the increase of load on pile top, the resistance of pile tip develops gradually.
桩端力发挥的程度与桩顶荷载的大小相关，桩顶压力较小时，桩顶荷载主要由桩侧摩阻力承担，随桩顶压力的增大，桩端力将逐渐发挥。
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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