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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。
Static probe is more and more widely used in marine geotechnical engineering. With the widespread application of large-diameter super-long piles in offshore engineering, excessive pile weight makes slip-piling frequently occur during pile-sinking. Therefore, for the piling control, it is very necessary to judge the pitch interval reasonably. Aiming at the problem that the calculation method of pile end resistance and pile side friction resistance currently used in the API specification is not suitable for the large-diameter extra-long pile, the process and mechanism of slip pile are discussed with the actual project. Data are presented to calculate the soil resistance under the conditions of slippery pile: the pile tip resistance is calculated by the method of LCPC (Lateral Pace and Chaussées), and the zoning method of pile-side frictional resistance suitable for the soil conditions in the South China Sea is proposed. The existing methods are combined with the sensitivity The friction of pile side is calculated, and the slip pile problem in the process of pile foundation construction of a platform in the South China Sea is studied and calculated, which proves the feasibility of the proposed method and provides reference and basis for pile foundation design.