中美欧规范钢管桩抗拔承载力设计对比

Comparative between Chinese,American,and European codes for design of uplift bearing capacity of steel pipepiles

海洋工程中,钢管桩是最广泛应用的桩型,钢管桩抗拔承载力的计算是桩基设计的一项重要内容,海外基桩抗拔承载力设计主要参照美国石油协会API RP 2A-WSD规范和欧洲规范EN1997-1。系统阐述了这两个规范与中国建筑桩基技术规范、码头结构设计规范抗拔承载力计算方法的异同,并结合实际工程计算钢管桩的抗拔承载力。对比各种方法的计算结果发现:1)在以黏性土为主的地层中,建筑桩基技术规范的计算桩侧阻力值与实测值偏差最小。2)在以黏性土、砂土为主的地层中,建筑桩基技术规范、API规范的计算值与实测值偏差最小。3)单桩抗拔承载力设计值参照EN规范的计算值最小。4)可参考《建筑桩基技术规范》、Michael Tomlinson所述方法进行软岩侧阻取值。

In marine engineering,steel pipe pile is the most widely used pile type,and the calculation of the uplift bearing capacity of steel pipe pile is an important content for pile foundation design. The API RP 2 AWSD code and European code EN 1997-1 are the main references for the design of pile capacity in foreign engineering. In this paper,the similarities and differences between these codes,the technical code for building pile foundation and the design codes for wharf structure are systematically described,and the uplift bearing capacity of steel pipe pile is calculated combined with practical engineering. Compared with the calculation results of various methods,it is found that: 1) In the stratum dominated by cohesive soil,the deviation between the calculated pile side resistance value and the measured value in the technical code for building pile foundation is the smallest. 2) In the stratum dominated by cohesive soil and sandy soil,the calculated results by the technical code for building pile foundations and API code have the smallest deviation from the measured result. 3) The design value of uplift bearing capacity calculated by EN code is the smallest. 4) The shaft resistance values of soft rock can be obtained from the technical code for building pile foundations or the method described by Michael Tomlinson.