双桩靴贯入对临近钢圆筒稳定性影响的数值分析  

Numerical Analysis of the Effect of Double Spudcan Penetration on Adjacent Steel Cylinders

作　　者：姜瑛[1] 张迅 曹永[1] 王凤云[1] 亓振 王胤[2] JIANG Ying;ZHANG Xun;CAO Yong;WANG Fengyun;QI Zhen;WANG Yin(Offshore Oil Engineering Co.Ltd.,Tianjin 300451;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024)

机构地区：[1]海洋石油工程股份有限公司,天津300451 [2]大连理工大学海岸和近海工程国家重点实验室,大连116024

出　　处：《土工基础》2023年第6期992-997,1008,共7页Soil Engineering and Foundation

基　　金：海洋石油工程股份有限公司专项研究项目(Z2022SYFNT1009)。

摘　　要：水下石油生产系统通常布置于海床上,其保护措施对生产系统的工作稳定性与安全性十分重要。根据实际海洋环境条件与水面航道要求,目前有工程创新性地采用大直径钢圆筒嵌入海床面一下作为水下生产系统的保护结构。对于此类型防护结构与工程应用,邻近自升式钻井船进行桩靴插拔作业时会对钢圆筒稳定性造成影响,带来安全隐患。现采用耦合欧拉与拉格朗日有限元数值方法对双桩靴贯入产生的钢圆筒扰动问题进行数值模拟分析。研究桩靴贯入过程中土体和钢圆筒基础的变形和应力变化,从而分析钢圆筒保护结构的稳定性与安全性。结果表明,钢圆筒筒壁附加应力及位移在初期随桩靴贯入深度增加而增大,达到峰值后趋于稳定;桩靴贯入到一定深度后,桩靴上部土体发生回流现象,导致对钢圆筒的影响降低;双桩靴对钢圆筒的影响随筒靴间距增大而减弱,但其影响范围较于单桩靴贯入有明显扩大。可为水下石油生产系统保护措施的设计与现场应用提供有效的参考依据。The underwater oil production system is usually arranged on the seabed,and its protection measures are crucial for the working stability and safety of the production system.According to the actual marine environmental conditions and the requirements of water channels,there are currently projects that innovatively use large-diameter steel cylinders embedded below the seabed as protection structures for underwater production systems.For this type of protective structure and engineering application,the stability of the steel cylinder will be affected when the spudcan penetration and extraction operation is performed near the jack-up drilling ship,which will bring potential safety hazards.In this paper,the coupled Euler and Lagrangian finite element numerical method is used to simulate and analyze the disturbance of the steel cylinder caused by double spudcans penetration.The deformation and stress changes of the soil and the steel cylinder foundation during the spudcan penetration process are studied,so as to analyze the stability and safety of the steel cylinder protection structure.The results show that the additional stress and displacement of the wall of the steel cylinder increase with the penetration depth of the spudcan at the initial stage and tend to be stable after reaching the peak;when the spudcan penetrates to a certain depth,the soil on the upper part of the spudcan reflows.As a result,the influence on the steel cylinder is reduced;the influence of the double spudcans on the steel cylinder is weakened with the increase of the distance between the spudcans and steel cylinder,but its influence range is significantly expanded compared with the single spudcan.The numerical analysis results in this paper will provide an effective reference for the design and field application of protection measures for underwater oil production systems.

关 键 词：自升式钻井船 桩靴贯入 钢圆筒 CEL方法 土体大变形 

分 类 号：TU473[建筑科学—结构工程]