Loading performance of fish and OMNI-Max anchors in crust-over-soft clays |
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| Affiliation: | 1. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling highway, Crawley, WA, 6009, Australia;2. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, Australia;3. Department of Civil Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, 02504, Republic of Korea;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China;2. School of Civil Engineering, Tianjin University, Tianjin, China;3. China Electric Power Research Institute, Beijing 100192, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China;1. Department of Offshore Oil and Gas Engineering, College of Petroleum Engineering, Xi’an Shiyou University, Xi’an, China;2. Research Institute of Marine Systems Engineering, Department of Naval Architecture and Ocean Engineering, Collage of Engineering, Seoul National University, Seoul, South Korea;3. Institute for Ocean Engineering, China University of Petroleum, Beijing, China;4. Natural Gas Department, Tarim Oilfield Company, PetroChina, Xinjiang, China |
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| Abstract: | This paper reports the results from three-dimensional dynamic finite element analysis undertaken to provide insight into the behaviour of the fish and OMNI-max dynamically installed anchors during loading in crust-over-soft clay sediments. Particular attention was focused on the situations where the anchor is embedded to a shallow depth during dynamic installation due to the strong crust layer. Large deformation finite element analyses were carried out using the coupled Eulerian-Lagrangian approach, incoporating the anchor chain effect. Parametric analyses were undertaken varying the initial embedment depth, anchor shape, loading angle, strength ratio between the top and bottom layers. The tracked anchor trajectory confirmed that the diving potential of the fish and OMNI-Max anchors were enhanced by the presence of the crust layer as that somewhat restircted the upward movement. This will be beneficial for many hydrocarbon active regions with layered seabed sediments where the anchor embedment depths during dynamic installation are expected to be low. |
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| Keywords: | Dynamically installed anchors Crust-over-soft clays Loading Numerical modelling Offshore engineering |
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