王泽根，  石小帆

(西南石油大学土木工程与建筑学院，成都 610500)

 

[摘要] 通过对现行《建筑桩基技术规范》(JGJ 94-2008)和《建筑地基基础设计规范》(GB 50007-2011)中估算单桩竖向承载力特征值计算方法的对比分析，认为于预制桩、钢管桩及大直径灌注桩（清底干净）的情况取2为安全系数是适合的。但是，对于其他成桩工艺或特殊桩周土的情况，由于单桩极限承载力及其特征值的对应关系发生变化，笼统地用安全系数2进行设计计算并不恰当，提出用特征值分项系数y’来代替安全系数2，结合工程实例分析验证了所提方法的合理性。

[关键词] 单桩竖向极限承载力；特征值；静载试验法；负摩阻力

中图分类号：TU470+．3    文献标识码：A    文章编号：1002-848X(2012) S2-0504-03

 

Wang Zegen, Shi Xiaofan

(School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China)

 

Abstract: By the comparative analysis of a calculation method about the single pile vertical load capacity in the existing Technical code for building pile foundations (JGJ 94-2008)  and Code for design of building foundation( GB 50007-2011),  we think in precast piles and steel pipe and piles oflarge diameter( clean bottom clean)  take 2 for safety coefficient is suitable. For other piling technology or special pile soil condition, because the corresponding relationship between the vertical load capacity of single pile and its eigenvalue has changed, in general terms, it is not appropriate to design and calculate with safety coefficient 2.Put forward by the partial factor of eigenvalue y’  to replace safety coefficient 2, and combined with the engineering examples to verify the rationality of the proposed method.

Keywords: vertical load capacity of single pile; eigenvalue; static load test method; negative friction resistance