Advances in the prediction of spudcan punch-through in double-layered soils |
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| Institution: | 1. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. Jack Up, Geotechnical & Metocean Dept., Noble Denton marine services, DNV GL - Oil & Gas, DNV GL, Vivo Building, 30 Stamford Street, London, SE1 9LQ, United Kingdom;3. Geotechnical Engineering Advisor, Engineering/Offshore & Infrastructure/Civil & Marine, ExxonMobil Production Company, 22777 Springwoods Village Parkway Spring, TX 77389, United States;1. Centre for Offshore Foundation Systems and ARC CoE for Geotechnical Science and Engineering University of Western Australia, 35 Stirling Hwy Crawley, Perth, WA 6009, Australia;2. IMPaC Offshore Engineering, Hohe Bleichen 5, 20354 Hamburg, Germany;3. Ramboll IMS Ingenieurgesellschaft mbH, Stadtdeich 7, 20097 Hamburg, Germany;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. School of Civil Engineering, Tianjin University, Tianjin, 300072, China;3. Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou, 450003, China;4. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, China;1. Department of Offshore Oil and Gas Engineering, College of Petroleum Engineering, Xi’an Shiyou University, Xi’an, China;2. Research Institute of Marine Systems Engineering, Department of Naval Architecture and Ocean Engineering, Collage of Engineering, Seoul National University, Seoul, South Korea;3. Institute for Ocean Engineering, China University of Petroleum, Beijing, China;4. Natural Gas Department, Tarim Oilfield Company, PetroChina, Xinjiang, China |
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| Abstract: | Punch-through failure of jack-up spudcan foundations occurs in active oil and gas drilling exploration regions, where relatively stiff soil overlies soft marine layer. Therefore, installation of spudcan foundations in such seabed formations threatens the stability of the jack-up rig. A site-specific assessment of the potential and severity of failure must be completed before the commencement of the installation. However, the accuracy of the prediction is limited by the validity of the design method currently in use. This paper presents advances in the prediction of punch-through failure of jack-up platforms in sand/stiff clay over soft clay soils. New analytical models for spudcan installation in double-layered soils are reviewed and compared to the existing methods in the ISO 19905-1 standard and SNAME standard. The capabilities and limitations of each method are summarised and recommendations are drawn for the theoretical predictions of spudcan punch-through in double-layered soils. |
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| Keywords: | Bearing capacity Spudcan foundations Sand Clay Offshore engineering |
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