海洋桩基平台钢管桩自由站立深度分析与问题探讨  

Analysis and Discussion on the Free Penetration Depth of Steel Pipe Piles of the Offshore Pile Foundation Platform

作　　者：刘双双[1] 

机构地区：[1]中海油田服务股份有限公司,天津塘沽300459

出　　处：《海岸工程》2017年第3期37-45,共9页Coastal Engineering

摘　　要：钢管桩基础是海洋导管架平台比较常用的一种基础形式,对钢管桩自由站立深度的准确预测是导管架平台安装项目中的一项重要工作。如果自由入泥深度评估不准确,现场施工时可能会导致钢管桩发生变形损坏,进而可能影响到整个油气田的生产运营。基于实际生产项目,讨论了钢管桩自由站立深度实际结果与预测值之间的关系,分析了造成实际结果的原因,论证了除自身结构性质外,钢管桩自由站立深度的影响因素主要包括海底地层性质和沉桩速度。海底浅部地层性质直接决定土对桩的承载力;沉桩速度决定土对桩的应力类型。实践表明,应用多种方法对钢管桩自由站立深度进行综合分析评价,能够考虑到多种影响因素,从而使评估工作更加全面,大大提高预测的准确度。Steel pipe pile foundation is one of the foundation forms more commonly used for the offshore jacket platform.Thus,the accurate prediction of the free penetration depth of the steel pipe piles is an important work in the jacket platform installation project.If the free penetration depth cannot be accurately predicted,the pipe piles might be deformed and damaged during the in-situ operation,and even the production and operation of the whole oil-gas field would be affected.Based on actual production projects,the relationship between the actual results of free penetration depth of steel pipe piles and their predicted values is discussed and the reasons producing the actual results are analyzed.Besides,the factors influencing the free penetration depth of the steel pipe piles are argued,which include chiefly the submarine stratum properties and the pile driving speed in addition to the structural characteristics of the piles.The properties of the shallow strata determine directly the bearing capacity of soil to pile and the pile driving speed determines the stress types of soil to pile.The practice shows that a variety of influencing factors can be considered if comprehensive analysis and evaluation of the free penetration depth of the steel pipe piles are carried out by using multiple methods,and then the evaluation work would be more complete and the prediction accuracy would be improved greatly.

关 键 词：钢管桩 自由站立深度 地层性质 沉桩速度 

分 类 号：TE42[石油与天然气工程—油气田开发工程]