A modified method to estimate chain inverse catenary profile in clay based on chain equation and chain yield envelope |
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| Institution: | 1. South China Institute of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China;2. Australian Research Council (ARC) Future Fellow, Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling highway, Crawley, WA 6009, Australia;3. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Australia;4. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;5. School of Engineering and Technology, Central Queensland University Australia, Bryan Jordan Drive, Gladstone, QLD 4680, Australia |
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| Abstract: | Offshore floating facilities are fixed by anchoring systems embedded in seabed soils through chains or ropes. The chain inverse catenary profile embedded in soils influences both the anchor failure mechanism and the anchor holding capacity. The chain mobilizes varying soil normal and tangential resistances during motion, hence it is with difficulty to depict the chain profile. The present work proposed a modified method to estimate the chain inverse catenary profile with high accuracy based on the chain equations and the chain yield envelope. A testing arrangement with three load cells and two MEMS (Micro-electromechanical systems) accelerometers included was designed in model tests. By model tests, the loading combinations of the soil tangential and normal resistances on the chain were obtained and the yield envelopes for both chain and rope were determined. In addition, supplemental model tests were performed to validate the modified method proposed in this study, and the testing results indicated that the estimated chain inverse catenary profile was in good agreement with the actual one. Moreover, the testing arrangement is beneficial in investigating the chain-soil-anchor interaction. |
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| Keywords: | Inverse catenary profile Chain equation Yield envelope Chain-soil interaction Anchoring systems |
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