方云飞，孙宏伟，闫莹

（北京市建筑设计研究院有限公司, 北京 100045）

 

［摘要］针对《建筑桩基技术规范》（JGJ 94—2008）所采用的单桩水平承载力特征值Rha的计算方法，分析了不同计算参数对Rha计算值的敏感性。结果表明各计算参数均对Rha计算值有较大影响，尤其是桩侧土水平抗力系数的比例系数m。根据两个工程实例，分别对桩顶铰接（或自由）和固接两种情况进行了计算，并与实测结果进行了对比分析。结果表明在桩顶铰接（或自由）情况下，单桩水平承载力特征值计算公式相对适中；桩顶固接情况下，该计算公式相对偏于不安全。

［关键词］桩基；单桩水平承载力特征值；敏感性分析；实例分析

中图分类号：TU473.1        文献标识码：A        文章编号：1002-848X(2013)01-0095-05

 

Fang Yunfei, Sun Hongwei, Yan Ying

(Beijing Institute of Architectural Design, Beijing 100045, China)

 

Abstract: According to the calculation method of characteristic value(Rha) of the horizontal bearing capacity for a single pile by Technical code for building pile foundations (JGJ 94—2008), the sensitivities of different parameters on the calculated values of Rha were analyzed. The results show that Rha will be influenced by the calculation parameters, especially the proportional coefficient(m) of the horizontal resistance coefficient of the soil. According to two engineering examples, two cases of the pile top connected with fixed and hinged(or free) were calculated, and comparative analysis of calculation results and measured data was done. The results show that calculation results of Rha for the pile top connected with hinged(or free) are relatively moderate, but calculation results of Rha for the pile top connected with fixed are relatively unsafe.

Keywords: pile foundation; characteristic value of the horizontal bearing capacity for a single pile; sensitivity analysis; example analysis

作者简介：方云飞，硕士，工程师，注册土木（岩土）工程师，Email：fangyunfei@126.com