Axial friction response of full-scale pipes in soft clays |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Geotechnical Engineering Institute of Tianjin University, Tianjin 300072, China;2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Geotechnical Engineering Institute of Tianjin University, Tianjin300072, China;1. Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, China;2. School of Engineering, The University of Warwick, Coventry CV4 7AL, UK;1. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling highway, Crawley, WA, 6009, Australia;2. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, Australia;3. Department of Civil Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, 02504, Republic of Korea;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;3. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | The axial friction response of subsea pipelines in soft clays is a very important aspect for designers of subsea pipelines but the response is not well understood so far. There is a pressing need for the comprehension of the response. In this paper, model tests are performed using full-scale pipes coated with polyethylene (PE) to study the effects of the set-up period, the pipe diameter, the buried depth of the pipe, the shear strength of soft clays and the loading rate on the axial friction response of pipelines in soft clays. The variations of the axial friction coefficient are analyzed using the effective stress method based on model test results. The results show that the axial friction resistance increases with the increasing pipe diameter but the effect of the pipe diameter on the axial friction coefficient can be neglected. The ultimate axial resistance also increases with the increase of the buried depth of pipelines, the undrained shear strength of soft clays and the loading rate. The axial friction coefficient increases with the increasing loading rate. However, the axial friction coefficient decreases with the increasing buried depth. The method to determine the axial friction coefficient is developed by analyzing model test results, which considers the effects of the diameter, the buried depth, the undrained shear strength of soft clays and the loading rate. The study results not only extend the industry data base but also supply a basis to determine the axial friction coefficient of PE-coated pipes in soft clays for ocean engineering geological investigations. |
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| Keywords: | Axial friction response Axial friction coefficient Pipe-soil interaction Model test Soft clay Subsea pipeline |
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