克里比深水港工程钢管桩桩端结构选型

Selection of pile tip of steel tubular pile in Kribi deep sea port engineering

针对克里比深水港工程码头后方轨道梁部分钢管桩无法沉桩至设计桩端持力层,承载力无法满足设计要求这一工程难题,提出通过优化桩端结构来提高钢管桩在硬黏土层中的承载力。对3种桩端结构进行了现场试验,并通过贯入度观测、打桩监控、高应变动力测试和静载试验等方法,分析了开口、半闭口和闭口钢管桩在硬黏土层中的贯入度、桩身应力和极限承载力的变化情况。基于现场试验结果,最终选定闭口桩端结构作为本项目的优化方案。

Some steel tubular piles located at the rear crane rail of Kribi deep sea port can not be driven into the design bearing layer, and the ultimately bearing capacity of them can＇t meet the design requirements. So we propose a method of optimizing the pile tip, aiming to improve the ultimately bearing capacity of steel tubular pile driven in stiff clay layer. We also carry out a trial piling of three types of pile tip including open-end, semi-closed and closed on the sit and analyze the set, driving stress and bearing capacity according to the survey of set, driving monitoring, high strain dynamic test and the axial compression static test. Finally, the type of closed pile tip is recommended on the basis of the test results.