大直径超长钢管桩溜桩机理及计算方法研究

发布时间：2018-10-13 09:24

【摘要】：海洋桩基平台经常采用大直径超长桩,因为桩和锤的重量很大,在沉桩过程中经常发生溜桩现象。为了便于打桩控制,判断溜桩的深度是非常必要的。该文结合实际工程对溜桩的过程和发生机理进行了探讨;提出了在溜桩状态下土阻力的计算方法:采用土的重塑指标计算桩侧摩阻力,采用别列柴策夫模式来计算砂土对桩端部环状基础的地基极限承载力;在此基础上,建立了判断溜桩范围的分析计算方法。针对南海某平台桩基沉桩过程中的溜桩问题进行了分析计算,验证了所提出的方法的合理性可供桩基设计以及沉桩施工参考。
[Abstract]:The large diameter super-long pile is often used in offshore pile foundation platform because of the heavy weight of pile and hammer the phenomenon of sliding pile often occurs in the process of piling. In order to facilitate piling control, it is necessary to judge the depth of slide pile. In this paper, the process and occurrence mechanism of pile slide are discussed, and the calculation method of soil resistance under sliding pile condition is put forward: the soil remolding index is used to calculate pile side friction, The ultimate bearing capacity of sand to the annular foundation at the end of pile is calculated by using the Pile-Chaiziff model, and the analytical calculation method for judging the range of sliding pile is set up on the basis of the calculation of the ultimate bearing capacity of sand on the circular foundation at the end of the pile. This paper analyzes and calculates the problem of pile slip in the course of piling on a certain platform in the South China Sea, and verifies that the rationality of the proposed method can be used as a reference for pile foundation design and piling construction.
【作者单位】：天津大学建工学院;海洋工程股份有限公司;
【基金】：国家自然科学基金项目(51322904,51279127)
【分类号】：TU476

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