Numerical modelling of seepage beneath skirted foundations subjected to vertical uplift |
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| Institution: | 1. Civil Engineering Department, Dong-A University, 840 Hadan 2-dong, Saha-gu, Busan 604-714, Republic of Korea;2. Korea Institute of Ocean Science and Technology, 787 Haean-ro, Sangrok-gu, Ansan-si, Gyeonggi-do, Republic of Korea;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin 300072, China;3. School of Civil Engineering, Tianjin University, Tianjin 300072, China;1. Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, PR China;2. College of Civil Engineering & Architecture, Shandong University of Science and Technology, Qingdao 266590, PR China;3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, PR China;1. Civil Engineering Laboratory (L.G.C.), National Engineering School of Tunis (ENIT, University of Tunis El-Manar), LGC-ENIT, BP 37, 1002 Tunis Le Belvédère, Tunisia;2. Systems and Applied Mechanics Laboratory (LASMAP), Ecole Polytechnique de Tunisie, El-Khawarizmi Street, La Marsa 2078, Tunisia;3. National Engineering School of Gabes (ENIG), Avenue Omar Ibn El Khattab, Zrig 6072, Gabes, Tunisia;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Norwegian Geotechnical Institute, Sognsveien 72, 0855 Oslo, Norway |
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| Abstract: | This study reports the results of small strain finite element analyses undertaken to determine the rate of displacement of skirted foundations subjected to uplift loading, due to combined swelling and seepage. Compatibility of foundation movement with cumulative seepage of water into the skirt compartment is modelled using a layer of soft poroelastic material immediately below the foundation top plate. Performance of the model is first assessed for a range of stiffness values for the soft layer. The model is then used to investigate the rate of displacement for skirt depths ranging from 0.1 to 1 times the foundation diameter. The results are compared with available theoretical solutions and experimental results, and expressions are provided for calculating the equivalent seepage lengths and resulting uplift velocities. The effect on the seepage behaviour of the presence of a gap down the external skirt–soil interface is also discussed. |
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| Keywords: | Consolidation Numerical analysis Offshore foundations Seepage Uplift |
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