Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Impact Characteristics of Subsea Pipeline Considering Seabed Properties and Burial Depth

해저지반 성질과 매설깊이 변화에 따른 해저파이프의 충돌 특성

  • Shin, Mun-Beom (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
  • Seo, Young-kyo (Department of Ocean Engineering, Korea Maritime and Ocean University)
  • 신문범 (한국해양대학교 해양공학과) ;
  • 서영교 (한국해양대학교 해양공학과)
  • Received : 2017.02.06
  • Accepted : 2017.06.22
  • Published : 2017.06.30
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Abstract

In this study, the impact characteristics of subsea pipelines that were installed in various soil types and burial depths were evaluated by a numerical method. An impact scenario replicated a dropped ship anchor that fell vertically and impacted an installed subsea pipeline. In order to calculate the impact force through terminal velocity, FLUENT, a computational fluid dynamic program and MDM (Moving Deforming Mesh) technique were applied. Next, a dynamic finite element program, ANSYS Explicit Dynamics, was used for impact analysis between the anchor and pipeline (or, subsea if they were buried). Three soil types were considered: loose sand, dense sand and soft clay by applying the Mohr-coulomb model to the seabed. The buried depth was assumed to be 0 m, 1 m and 2 m. In conclusion, a subsea pipeline was the most stable when buried in dense sand at a depth of 2 m to prevent impact damage.

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References

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