(1中国建筑科学研究院地基基础研究所， 北京  100013； 2 建筑安全与环境国家重点实验室， 北京  100013；  3 北京市地基基础与地下空间开发利用工程技术研究中心， 北京  100013)

［摘要］桩身轴力传递自上而下逐渐减弱，桩身压缩也随之由大变小。对于长桩，大量实测结果表明，在工作荷载下，中下部桩身侧摩阻力较难发挥，桩身也不会发生压缩变形。基于桩侧摩阻力分布概化结果计算桩身压缩量，采用综合系数法，将实际桩侧摩阻力分布的形式按不同桩侧摩阻力概化模式进行概化，概化后分解为基本的矩形和三角形单元分别计算，并与实际工程的试桩实测桩身压缩量进行对比。结果表明，采用的桩身压缩量计算方法计算结果与实测值较为接近，说明采用的桩身压缩量计算方法可靠，可为类似工程提供参考。

［关键词］桩侧摩阻力； 端阻力； 概化模式； 超长桩； 桩身压缩量

中图分类号：TU473文献标识码：A文章编号：1002-848X(2019)17-0130-06

Calculation of  pile body compression based on pile shaft resistance conceptualization mode

Wang Tao1,2,3, Chu Zhuo1,2,3, Liu Jinli1,2,3, Wang Xu1,2,3

(1 China Academy of Building Research Foundation Institute, Beijing 100013, China; 2 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 3 Beijing Engineering Technology Research Center of Foundation and City Underground Space Development and Utilization, Beijing 100013, China)

Abstract:The axial force transmission of pile body gradually weakens from top to bottom, and the compression of pile body also decreases from large to small. For long piles, a large number of measured results show that under normal working load, the shaft resistance of the middle and lower part of the pile body is difficult to play, and the pile body will not undergo compression deformation. Based on the conceptualized results of pile shaft resistance distribution, the compression of pile body was calculated. The actual distribution of pile shaft resistance was conceptualized according to different conceptualization mode of pile shaft resistance. After generalization, it was decomposed into basic rectangular and triangular elements, and compared with the measured compression of pile body in practical engineering. The results show that the calculated results of pile compression are close to the measured values, which indicates that the calculation method of pile compression is reliable and can provide reference for similar projects.

Keywords:pile shaft resistance; tip resistance; conceptualization mode; super-long pile; pile body compression