Hydrodynamic behavior of a long-large and irregular submarine pipeline adopting a novel immersion approach during immersion construction
Su Y. Li C. Wu Z. Xie C. Garg A. Chen G. Hu H. Tan P. Zhang B. Wu H.
15 April 2025Elsevier Ltd
Ocean Engineering
2025#323
The hydrodynamic behavior of the long-large and irregular submarine pipeline (LISP) is expected to be different from that of the linear pipeline in immersion process. Further, the LISP is prone to cause the stress concentration, cables tension uneven distribution and cables taut-slack phenomenon. This further makes construction process for these types of pipelines more dangerous and uncontrollable. To reduce the potential risks and improve the stability of the immersion construction, a novel approach with a special immersion system is designed. Based on the pipeline theory, winch theory, and fluid loads theory, the numerical model is established. The hydrodynamic behavior of the pipeline immersion system during immersion is investigated. A sensitivity analysis is conducted with varying key parameters, such as the cable release velocity, airbag shape, and external environmental conditions. The results of the proposed numerical simulation show a high degree of consistency with the actual measured data. This novel immersion approach is feasible for the immersion construction of LISP. The cable tension and pipeline stress are very sensitive to the cable release velocity, wave height and tide. This study can provide valuable construction suggestions and avoid potential engineering risks and improve the economy for the immersion engineering of LISP.
Hydrodynamic behavior , Irregular shape , Novel immersion approach , Submarine pipeline
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Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Structural Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, China
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China
Guangdong Engineering Center for Structure Safety and Health Monitoring, Department of Civil and Smart Construction Engineering, Shantou University, China
Visiting Foreign Specialist, L.N. Gumilyov Eurasian National University, Astana, Kazakhstan
Guangxi Beitou Environmental Protection Water Group Co., LTD, China
China Shipping Engineering Construction General Administration Co., LTD, China
Jiangsu Peirun Underwater Engineering Co., LTD, China
Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education
State Key Laboratory of Coastal and Offshore Engineering
Guangdong Engineering Center for Structure Safety and Health Monitoring
Visiting Foreign Specialist
Guangxi Beitou Environmental Protection Water Group Co.
China Shipping Engineering Construction General Administration Co.
Jiangsu Peirun Underwater Engineering Co.
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