PHC管桩的单桩竖向承载力下限解研究

单桩竖向承载力是影响桩基设计的核心内容之一。根据现场静载荷试验得到PHC管桩单桩竖向承载力，运用灰色关联理论对PHC管桩竖向承载力数据进行相关性分析，发现影响单桩竖向承载力的主要控制因素是桩长。根据夏皮洛-威尔克（Shapiro-Wilk）检验方法探究单桩竖向承载力的分布特征，发现单桩竖向承载力R在随桩长l线性拟合预测值两侧呈正态分布，得到在95 %保证率条件下单桩竖向承载力下限解方程。

Study on the Lower Limit Solution of Vertical Bearing Capacity of Single PHC Pipe Pile

The vertical bearing capacity of single pile is one of the core contents that affect the design of pile foundation. The vertical bearing capacity of single PHC pipe pile is obtained according to the field static load test, and the correlation analysis of the vertical bearing capacity data of PHC pipe pile is carried out by using the grey correlation theory. It is found that the main control factor affecting the vertical bearing capacity of single pile is the length of pile. According to the Shapiro-Wilk test method, the distribution characteristics of the vertical bearing capacity of single pile are tested. It is found that the vertical bearing capacity R of a single pile is normally distributed on both sides of the linear fitting prediction value along with the pile length L. the lower limit solution equation of the vertical bearing capacity of a single pile under the condition of 95 % assurance rate is obtained.