海洋工程中桩基水平向承载力可靠指标的影响因素分析

Reliability Analysis on Laterally Loaded Pile Foundation of Ocean Structure

桩基础水平向承载力的计算是海洋工程中桩基设计的重要组成部分。论文在搜集了大量平台建设资料的基础上 ,以现有的桩基水平向承载力的设计计算方法为依据 ,进行了水平向承载力的可靠度研究。对影响可靠指标的各个因素进行了灵敏度分析。

The reliability theory has been widely used in ocean engineering. With the rapid development of oil fields in Bohai gulf, the so called Load and Resistance Factor Design Method (LRFD) for platform foundation design will be adopted in China and worldwide, which is on the basis of the reliability approach. The pile foundations have to sustain random lateral forces induced by wine and wave. At the same time, the lateral bearing capacity of piles relay on the soil properties, which usually possess great uncertainty. Base on an established database of geological properties of subsoil , a procedure for risk analysis on lateral loaded piles of ocean structures foundation is presented. The stability of some existing platform pile foundations has been analyzed by performing the proposed approach. The reliability analyses show that when the variation of the load increases, the partial factors of the load will increase. On the other hand, when the variation of soil strength increases, its partial factor will decrease.