基于桩顶沉降的桩基竖向承载力和位移分析

基于按桩顶沉降分析桩基承载力和位移的思想 ,提出了一种改进的竖向受荷桩荷载传递计算方法。该方法以桩身压缩量为迭代变量 ,根据桩身的轴向变形与桩侧土变形协调关系 ,通过编制的计算程序 ,可按桩顶沉降直接计算桩顶荷载、桩身轴力分布以及桩身各点的位移 ,特别适用于对桩顶沉降有严格控制要求的桩基设计。结合某工程试桩实测数据进行了分析 ,理论计算与实测结果吻合较好。

ANALYSIS OF VERTICAL BEARING CAPACITY AND DISPLACEMENT BY THE SETTLEMENT OF PILE TOP

Based on the idea to determine the pile′s vertical bearing capacity and deformation by the settlement of pile top, a modified load-transfer method is proposed for analyzing axially loaded piles. According to the deformation coordination of shaft and soil, a calculating program is designed. In the program, the compression of shaft is required as the only iterative variable. The vertical bearing capacity of pile top, axial force and the deformation of the shaft can be calculated through the program. The suggested method is especially suitable for pile foundation design with strict requirement of the settlement of pile top. Finally, the method is analyzed by the measured data on test piles for a project, and the calculated results agree well with the in-situ data.