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Response of skirted suction caissons to monotonic lateral loading in saturated medium sand
Authors:Da-yong Li  Yu-kun Zhang  Ling-yun Feng  Yan-xue Guo
Institution:1. Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao, 266590, China
2. Geotechnical Research Institute, Hohai University, Nanjing, 210098, China
Abstract:Monotonic lateral load model tests were carried out on steel skirted suction caissons embedded in the saturated medium sand to study the bearing capacity. A three-dimensional continuum finite element model was developed with Z_SOIL software. The numerical model was calibrated against experimental results. Soil deformation and earth pressures on skirted caissons were investigated by using the finite element model to extend the model tests. It shows that the “skirted” structure can significantly increase the lateral capacity and limit the deflection, especially suitable for offshore wind turbines, compared with regular suction caissons without the “skirted” at the same load level. In addition, appropriate determination of rotation centers plays a crucial role in calculating the lateral capacity by using the analytical method. It was also found that the rotation center is related to dimensions of skirted suction caissons and loading process, i.e. the rotation center moves upwards with the increase of the “skirted” width and length; moreover, the rotation center moves downwards with the increase of loading and keeps constant when all the sand along the caisson’s wall yields. It is so complex that we cannot simply determine its position like the regular suction caisson commonly with a specified position to the length ratio of the caisson.
Keywords:skirted suction caissons  bearing capacity  model tests  monotonic lateral loading  numerical modeling
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