一种新的夯扩灌注桩单桩竖向极限承载力公式

针对设计与施工中遇到的单桩承载力问题，采用计算与统计分析方法，对近10年来所完成的数百项工程，将其打桩原始记录、地质勘察报告与单桩竖向静载试验得出的承载力相对比而得出了一种小误差的夯扩灌注桩单桩竖向极限承载力计算公式，与单桩竖向静载试验吻合很好，对夯扩灌注桩设计与施工具有重要参考意义。介绍了夯扩灌注桩单桩极限承载力的研究方法、研究成果及应用效果检验。

New formula of ultimate bearing capacity with small error for pile with rammed and enlarged base

Aiming at the bearing capacity for pile hammer in the design and construction, the paper adopts the calculation and statistics analysis method. A new calculation formula of the ultimate bearing capacity with small error for the pile is obtained according to the contrasts among the primitive piling records, geotechnical investigations reports and the ultimate bearing capacity for single pile from loading tests in hundreds of projects in the past decade. The formula tallies perfectly with the result of loading tests, and has important referring sense to the design & construction of piles with rammed and enlarged base. The research method, study result and application effect of the formula of the pile are introduced briefly in this paper.