Collision Analysis Between Spudcan and Seabed During the Process of Jack-up Platform Lowering Jack-up Legs
In the leg-lowering process, the offshore jack-up platform is in a floating state, and the spudcan may collide with the seabed due to the platform motion in waves, thereby threatening the safety and stability of the platform. This paper first analyzed the hydrodynamic response of a jack-up platform...
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Published in | China ocean engineering Vol. 35; no. 5; pp. 779 - 788 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.09.2021
Springer Nature B.V State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China School of Civil Engineering,Tianjin University,Tianjin 300072,China%State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China%China Classification Society (CCS),Tianjin 300457,China |
Subjects | |
Online Access | Get full text |
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Summary: | In the leg-lowering process, the offshore jack-up platform is in a floating state, and the spudcan may collide with the seabed due to the platform motion in waves, thereby threatening the safety and stability of the platform. This paper first analyzed the hydrodynamic response of a jack-up platform under different sea states. Then a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up legs. The results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period increases. The motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°. The collision angle between the spudcan and seabed has a large influence on the collision response, while the velocity of leg-lowering has little influence on the collision response. The collision response is also significantly affected by soil conditions. For clay, the increase in undrained shear strength and Young’s modulus will increase the impact force. |
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ISSN: | 0890-5487 2191-8945 |
DOI: | 10.1007/s13344-021-0069-1 |