桩底后压浆钻孔灌注桩侧阻力变化对竖向承载力影响的讨论

在对侧摩阻力提高机理的探讨和总结的基础上，重点研究桩底压浆对桩基竖向承载力的贡献。尤其是桩侧摩阻力的变化——能够显著提高桩侧竖向承栽极限摩阻力。同时，基于压浆液对桩底上抬作用的理论研究，推导出桩顸上抬位移与上抬力关系的解析式。并对桩底后压浆桩的极限承载力计算提出建议性修正。可为相关领域的工程研究人员提供一定的借鉴。

Influence of Shaft Friction on Vertical Bearing Properties of Base-grouting Bored Cast-in-place Pile

Through the discussion of the improvement mechanism shaft friction resistances, the bearing capacity of pile can be improved greatly by base-grouting, especially the change of shaft friction can evidently increase vertical bearing limit shaft friction. The effect of upward press on the bottom from basegrouting is researched, and a relational equation of pile top displacement and upward press is derived. Some reference corrections to the ultimate bearing capacity of base-grouting pile are presented at last. They can provide some reference for the researchers and technicians in the related field.