Investigation of scour effects on lateral behaviors of suction caisson |
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| Authors: | Jinzhong Liu Zhende Zhu Baotian Wang Fushun Liu Jianpeng Xu |
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| Institution: | 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, China;2. Jiangsu Research Center for Geomechanical Engineering Technology, Hohai University, Nanjing, China;3. Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao, China |
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| Abstract: | ABSTRACTThe use of suction caissons can reduce the development costs of offshore wind energy and has broad application prospects. However scour around marine foundations is inevitable, it gravely affects the stability of marine engineering. Therefore, there is an urgent need to study the weakening effects of scour on suction caisson. In this study, the variation trends of remaining soil parameters (the effective unit weight and the peak effective friction angle) after scour are examined with consideration of the dilatancy and stress history of sandy silt. It is found that the parameters of shallow soil change considerably after scour, and the larger the scour depth, the greater is the change in the parameters. However, the deep soil is less affected. On the basis of these findings, scour effects on the ultimate moment capacity of suction caisson are studied. The ultimate moment capacity is found to greatly reduce under scour, and its calculated value is larger than the actual value when the effects of dilatancy and stress history are ignored. To simplify calculation, it is feasible to replace the ultimate moment capacity when both dilatancy and stress history are considered with that when only dilatancy is considered. |
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| Keywords: | Dilatancy scour stress history suction caisson ultimate moment capacity |
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