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<p>Mining risers are vulnerable to complex nonlinear flow-induced vibration (FIV) failure due to the combined effects of internal gas-liquid-solid three-phase flow and external ocean loads. This study establishes a gas-liquid-solid three-phase FIV model of the deep-sea hydrate mining riser using the finite element method and Hamilton’s principle. A nonlinear vibration simulation experimental device for the mining riser has been developed. The model’s accuracy is validated by comparing experimental test results with theoretical model calculations. The study analyzes the influence of external environmental parameters and multiphase flow parameters on riser fatigue life. Results indicate that parameter increases intensify riser fatigue damage. Alternating stress has a more pronounced effect on riser fatigue life than the dominant frequency. During riser resonance, both triaxial stress and stress main frequency increase, leading to a sharp decrease in overall riser fatigue life. The research demonstrates that adjusting readily controllable operating parameters can effectively enhance riser vibration amplitude frequency, thereby extending fatigue life and ensuring safe, stable deep-sea hydrate mining operations.</p>

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Fatigue Failure Mechanisms of Mining Risers Induced by Gas-Liquid-Solid Three-Phase in Deep-Sea Natural Gas Hydrate Extraction

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Xiao-qiang Guo,
  • Jun-lin Lyu,
  • Ke-lun Yang,
  • Yuan-zhe Ren,
  • Xin-ye Li,
  • Li-bin Zhao

摘要

Mining risers are vulnerable to complex nonlinear flow-induced vibration (FIV) failure due to the combined effects of internal gas-liquid-solid three-phase flow and external ocean loads. This study establishes a gas-liquid-solid three-phase FIV model of the deep-sea hydrate mining riser using the finite element method and Hamilton’s principle. A nonlinear vibration simulation experimental device for the mining riser has been developed. The model’s accuracy is validated by comparing experimental test results with theoretical model calculations. The study analyzes the influence of external environmental parameters and multiphase flow parameters on riser fatigue life. Results indicate that parameter increases intensify riser fatigue damage. Alternating stress has a more pronounced effect on riser fatigue life than the dominant frequency. During riser resonance, both triaxial stress and stress main frequency increase, leading to a sharp decrease in overall riser fatigue life. The research demonstrates that adjusting readily controllable operating parameters can effectively enhance riser vibration amplitude frequency, thereby extending fatigue life and ensuring safe, stable deep-sea hydrate mining operations.