通过对同一场地不同桩长的桩的荷载与沉降实测资料的对比分析，得出：对于入持力层为中等风化岩以上的桩，其承载力与桩的长度关系不大，桩长变化时，桩的承载力变化不大，长桩反而会引起桩顶沉降大，呈摩擦桩性状；短桩则呈端承桩性状，桩端阻力大，桩顶沉降小。 By comparison and analysis of the actual load and settlement data of piles with different pile lengths on the same site, it is concluded that for piles with medium or more weathered rock, the bearing capacity is not related to the length of piles, and the pile length changes. The bearing capacity of the pile does not change much. Instead, the long pile will cause large settlement of the pile top and show the characteristics of friction piles. The short piles will be characterized by end-loading piles, large pile tip resistance, and small pile top settlement.