The steel catenary riser(SCR)is laid on the seabed,and under the action of floating body motion and environmental loads,the pipeline exhibits an upward movement to pull out of the seabed.However,the viscous properties of soft seabed hinder the pipeline's extraction,resulting in a suction effect.The magnitude of suction is related to the extraction speed of the pipeline,the number of pipeline-soil interaction cycles,soil remolding time,and other factors.Based on existing experimental data,a numerical model for suction is developed to improve dynamic analysis programs for risers.The effects of extraction speed and pipe diameter on suction distribution,dynamic response,and fatigue life in the touchdown zone(TDZ)are investigated.Results show that seabed soil suction significantly affects stress in the TDZ,especially bending stress,with similar trends.The influence of pipe diameter is mainly reflected in penetration depth relative to diameter;smaller diameters result in greater relative penetration depth and extraction displacement,while larger diameters lead to the opposite.Extraction speed is a primary factor affecting maximum seabed suction and extraction displacement;both increase with extraction speed,exacerbating fatigue damage in the TDZ.Exploring the suction effect of pipe-soil coupling and its impact on fatigue damage in the TDZ can provide crucial insights for SCR interaction with complex seabeds and engineering applications.
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