When the length of the pile under the bottom of the pit is the same, the deeper the excavation is, the larger the ultimate uplift capacity of pile is.
坑底以下有效桩长相同时，开挖深度越大，开挖后桩周土体超固结比越大，抗拔桩极限承载力也越大。
Reliability calculation example shows that: in multi-layer soil pile, the reliability of a long pile bearing capacity is impacted greatest by the length of the pile.
可靠度计算实例表明，在多层土长桩承载力可靠性受桩长影响最大。
The pile stiffness is reduced by the pile-pile interaction and the effective length of piles becomes longer.
桩桩相互作用降低了桩的刚度，并使群桩的有效桩长加大了。
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