Study on deepwater conductor jet excavation mechanism in cohesive soil |
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| Institution: | 1. School of Civil and Environmental Engineering, Cornell University, 220 Hollister Hall, Ithaca, NY 14853, United States;2. Center for Applied Mathematics, Cornell University, 657 Frank H.T. Rhodes Hall, Ithaca, NY 14853, United States;3. Asian School of the Environment, Nanyang Technological University, 62 Nanyang Dr, Singapore, 637459, Singapore;1. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Shanghai Key Laboratory of Ship Engineering, Marine Design and Research Institute of China, Shanghai, China;1. State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China;3. Hubei Provincial Engineering Technology Research Center for Magnetic Suspension, Wuhan University of Technology, Wuhan 430070, China;4. Institute of Advanced Materials and Manufacturing Technology, Wuhan University of Technology, Wuhan 430070, China;1. Tunnelsoft – BabEng, Lübeck, Germany;2. Institute for Tunnelling and Construction Management, Ruhr-University Bochum, Bochum 44801, Germany;3. Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, ON K7L3N6, Canada |
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| Abstract: | Conductor casing jetting technique has been increasingly applied in deepwater drilling. The insight into the jetting excavation mechanisms is critical in guiding a successful conductor casing jetting operation. The real- time continuous jet excavation process is simulated with the volume of fluid (VOF) multiphase method of CFD (Computational Fluid Dynamics) ANSYS Fluent calculation software in the current study. The cohesive soil is modelled by using a kind of viscous fluid with Herschel-Bulkley model. In addition, a laboratory half round nozzle jet excavation test is designed for verification by comparison of the observed jet excavation profile with the numerical results. The sensitivity parameters affecting the conductor jetting excavation mechanism in cohesive soil are thus investigated. It is found that the application of Herschel-Bulkley (HB) model for cohesive soil and the VOF method of Fluent can provide a good simulation of jet excavation process. The maximum excavation depth can be determined by the undrained ultimate bearing capacity of the circular foundation with a bearing capacity factor of 6.7. The nozzle position, jet velocity and soil strength have significantly influence on the depth and width of the jet excavation profile in conductor oblique jet. |
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| Keywords: | Jet excavation Herschel-Bulkley model CFD Conductor casing Deepwater drilling |
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