Penetration response of spudcans in layered sands |
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| Institution: | 1. Daewoo Shipbuilding & Marine Engineering Co. Ltd. (DSME), 96, Baegot 2-ro, Siheung-si, Gyeonggi-do, Korea;2. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;3. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;4. Dean and Professor of Civil Engineering, Melbourne School of Engineering, Doug McDonell Building, The University of Melbourne, Victoria, 3010, Australia;5. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;6. Daewoo Shipbuilding & Marine Engineering Co. Ltd. (DSME), 96, Baegot 2-ro, Siheung-si, Gyeonggi-do, Korea;1. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;2. China Oilfield Services Limited, Sanhe 065201, China;1. Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao, China;2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China |
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| Abstract: | The behaviour of spudcan foundations during the installation and preloading in two-layer sand sediments was investigated through large deformation finite element (LDFE) analyses. The LDFE analyses were carried out using the coupled Eulerian-Lagrangian approach, modifying Mohr-Coulomb soil model to capture hardening and subsequent softening effects of sand. Parametric analyses were undertaken varying the top layer thickness, relative density of sand and spudcan diameter. Both loose to medium dense-over-dense and dense-over-loose to medium dense sand deposits were explored. The results showed that, for the investigated relatively thin top layer thickness of ≤ 5 m, spudcan behaviour was dictated by the bottom sand layer with a minimal influence of the top layer. For assessing the penetration resistance profile in two-layer sands, the performance of the ISO, SNAME, InSafeJIP, and other existing theoretical design methods were evaluated. |
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| Keywords: | Spudcan Penetration resistance Large deformation finite element Two-layer sands |
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