Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA;1. School of Naval Architecture, Dalian University of Technology, Dalian, China;2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;1. Department of Civil and Environmental Engineering, University of Louisville, 132 Eastern Pkwy, Louisville, KY 40208, United States;2. Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India;1. School of Mechanical Engineering, Changwon National University, 20, Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do, Republic of Korea;2. School of Mechanical & Automotive Engineering, Songwon University, 73, Songam-ro, Nam-gu, Gwangju, Republic of Korea;1. University of Liège, ANAST, 1 Chemin des Chevreuils, 4000 Liège, Belgium;2. GeM Institute UMR 6183 CNRS – ICAM Nantes, 35 Avenue du champ de Manœuvres, 44470 Carquefou, France |
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| Abstract: | Upheaval buckling of submarine pipelines occurs due to relative movement of pipeline and surrounding soil and is often triggered by high operational temperature of the pipeline, initial imperfection of the pipeline, or a combination of both. Since buckling can jeopardize the structural integrity of a pipeline, it is a failure mode that should to be taken into account for the design and in-service assessment of trenched and buried offshore pipelines. In this study, a series of vertical (uplift) and axial pullout tests were carried out on model pipe segments buried in soft clay deposit similar to that present in Bohai Gulf, China. Pipe segments with three different diameters (= 30 mm, 50 mm and 80 mm) were buried in different depth-to-diameter ratios ranging from 1 to 8. Based on the results of laboratory tests, nonlinear force–displacement relations are proposed to model soil resistance mobilized during pipeline movement. The proposed nonlinear soil resistance models are employed in finite element analysis of buried pipelines with different amplitudes of initial geometric imperfections. Thermal upheaval buckling behavior of pipelines operating at different temperatures is studied. Results show that the capacity of pipeline against thermal buckling increases with the burial depth and decreases with the amplitude of initial imperfection. |
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| Keywords: | Buried offshore pipelines Thermal upheaval buckling Initial imperfection Finite element analysis Laboratory experiment |
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