海洋平台桩基础竖向承载力的可靠度分析

Reliability Analysis on the Vertical Capacity of Pile Foundations of Platforms

应用可靠度理论对渤海某油田平台桩基础的竖向承载能力进行了可靠度分析。首先根据搜集的渤海海域土的钻孔资料及设计资料建立了数据库,然后利用其统计结果,并选取一个平台应用改进的一次二阶矩法进行可靠度计算并进行相关的分析。阐明了各个设计参数的重要程度及其变化对分项系数及可靠度指标的影响规律,并将分折结果与API规范中规定的分项系数进行比较,从而证明其对渤海油田桩基础设计的适用性。

The reliability of the vertical capacity of the pile foundations of platforms is analyzed. First, a database including plenty of soil data in Bohai Sea is developed. Then via its statistical calculation, the reliability analysis on the vertical capacity of the pile foundation of a platform is implemented by the improved first-order second-moment method. The sensitivity of the reliability index to the variance of load and soil properties are analyzed. Furthermore, the calculated partial factors are satisfied with the requirements in API specifications.