Model tests on performance of offshore wind turbine with suction caisson foundation in sand |
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Authors: | Hai-lei Kou Dan-liang Yang Wang-chun Zhang Yi-fan Wu Qiang Fu |
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Institution: | 1. College of Engineering, Ocean University of China, Qingdao, China;2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Ecnomic Zone, Qingdao University of Technology, Qingdao, China;3. hlkou@ouc.edu.cn;5. School of Architecture and Civil Engineering, Weifang University of Science and Technology, Weifang, China;6. Facility Horticulture Laboratory of Universities in Shandong, Weifang University of Science and Technology, Weifang, China;7. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, China |
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Abstract: | AbstractThe performance of steel caisson during and after installation with different penetration velocities in medium dense sand is presented. The applied jacking forces, the amount of formed soil heave and bearing capacity were measured in the model tests. The influence of penetration velocities on jacking forces, soil heave and bearing capacity were also discussed in detail. The results indicated that the jacking forces for caisson in medium dense sands were significantly affected by the penetration velocity. The larger the penetration velocity, the more soil flowed into the caisson cavity during installation. This will lead to larger inner shaft resistance and in turn more jacking forces required for the same penetration depth. The height of soil heave during installation increases with penetration velocity. The m value calculated by the ratio of the volumes of the soil heave to that of the penetrated caisson wall can be used to evaluate the soil heave. The larger the applied velocity, the larger the m value and larger bearing capacity of caisson after installation. The relationship between the m value and penetration velocity can be used to control the soil heave for a steel caisson with a wall thickness to external diameter ratio of 4.2% in medium dense sand by jacking method. |
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Keywords: | Steel caisson penetration velocity jacking force soil heave bearing capacity |
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