大直径扩底桩承载力及变形计算

Method for Calculating Bearing Capacityand Settlement or Hand-Mined Cylinder Piles

本文通过对１０根置于不同持力层、具有不向桩身及扩大端直径的人工开挖大直径扩底桩的试验结果分析．提出了砂性及碎石类土中大直径扩底桩的变形计算机模式与参数；并根据变形函数，以变形量为极限承载力控制标准，给出了临界桩径承载力参数及大直径桩承载力折减系数。

Based on the forty measured load-settlement (p-s ) curves, this paper analyses the (p-s ) behavior and presents a method for calculating the bearing capacity and settlement of hand-mined castinsitu cylinder piles rested at different load bearing strata, with different pile diameters and belled--out ends. According to the (p-s) curves, the coefficients for the calculation formulas have been found through mathematical statistics method. The values of bearing capacity and settlement calculated by the method presented are in good agreement with the measurement results.