静力触探在大直径超长桩溜桩分析中的应用

发布时间：2018-04-17 11:07

本文选题：桩基础 + 大直径超长桩　；参考：《岩石力学与工程学报》2016年S1期

【摘要】：静力触探在海洋岩土工程中的应用越来越广泛。随着大直径超长桩在海洋工程中的普遍应用,过大的桩锤自重使得溜桩现象在沉桩过程中频繁发生。因此对于打桩控制而言,合理的判断溜桩区间是十分必要的。针对目前所使用的API规范中桩端阻力与桩侧摩阻的计算方法对大直径超长桩不适应的问题,结合实际工程对溜桩的过程和发生机制进行探讨;利用静力触探测试数据提出在溜桩状态下土阻力的计算方法:利用LCPC(Laboratoire Central des Ponts et Chaussées)法计算桩端阻力,提出适合南海土质条件的桩侧摩阻力的分区方法,使用已有方法与灵敏度结合计算桩侧摩阻力,针对南海某平台桩基施工过程中发生的溜桩问题进行研究计算,证实建议方法的可行性,为桩基设计提供参考与依据。
[Abstract]:Static penetration exploration is more and more widely used in marine geotechnical engineering.With the wide application of large diameter and super long pile in ocean engineering, excessive weight of pile hammer makes the phenomenon of sliding pile occur frequently in the process of piling.Therefore, it is very necessary for pile driving control to judge the slip pile interval reasonably.Aiming at the problem that the calculation method of pile tip resistance and pile side friction in API code is not suitable for large diameter and super long pile, the process and occurrence mechanism of slide pile are discussed in combination with actual engineering.Based on the static penetration test data, the calculation method of soil resistance under the condition of sliding pile is put forward: the method of LCPC(Laboratoire Central des Ponts et Chauss 茅 es) is used to calculate the pile tip resistance, and the partition method of pile side friction resistance suitable for the soil condition in the South China Sea is put forward.By using the existing method and sensitivity to calculate the friction of pile side, this paper studies and calculates the problem of sliding pile during the construction of a platform pile foundation in the South China Sea, verifies the feasibility of the proposed method, and provides a reference and basis for the design of pile foundation.
【作者单位】：天津大学建工学院;天津大学天津市软土特性与工程环境重点实验室;海洋石油工程股份有限公司;
【基金】：国家自然科学基金资助项目(51279127,41372291) 天津市科技计划项目(15JCZDJC40600)~~
【分类号】：TU473.1

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