Centrifuge modeling of steel catenary risers at touchdown zone part I: Development of novel centrifuge experimental apparatus

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• 作者：Bradley J. Elliott^a ; ^b ; Arash Zakeri^c ; ¹ ; ^{arash.zakeri@bp.com} ; ^{azakeri@mun.ca} ; Andrew Macneill^a ; Ryan Phillips^a ; Edward C. Clukey^c ; George Li^d
• 关键词：Steel Catenary Riser (SCR) ; Touchdown Zone ; Fatigue ; Riser&ndash ; soil interaction ; Centrifuge modeling
• 刊名：Ocean Engineering
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：60
• 期：Complete
• 页码：200-207
• 全文大小：2877 K

文摘

The critical location for fatigue damage in Steel Catenary Risers (SCRs) is often located within the touchdown zone (TDZ), where cyclic interaction of the riser with the seabed occurs. Riser-fluid-soil interaction at the TDZ is a complex phenomenon with significant room for improving the understanding of the interaction, the trench formation mechanism, and their influence on fatigue life. This paper describes a novel experimental tool developed for SCR testing in a geotechnical centrifuge. It discusses the modeling parameters, scaling considerations, and developed actuation system. Further, it presents the results of a series of trial tests done on an elastic seabed model and compares the measurements to the results of finite element analysis. Finally, it discusses the potential of the tool in modeling SCRs at TDZ using seabed soil and dual frequency Response-Amplitude-Operator (RAO) motions.