Int. J. Nav. Archit. Ocean Eng. (2015) 7:720~738 http://dx.doi.org/10.1515/ijnaoe-2015-0051 pISSN: 2092-6782, eISSN: 2092-6790 ⓒ SNAK, 20 15 Corresponding author: Jae-Myung Lee, e-mail: [email protected] This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Lab-scale impact test to investigate the pipe-soil interaction and comparative study to evaluate structural responses Dong-Man Ryu 1 , Chi-Seung Lee 1 , Kwang-Ho Choi 1 , Bon-Yong Koo 2 Joon-Kyu Song 2 , Myung-Hyun Kim 1 and Jae-Myung Lee 1 1 Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan, Korea 2 Korea Energy Technology Center, American Bureau of Shipping, Busan, Korea Received 11 November 2014; Revised 20 January 2015; Accepted 7 May 2015 ABSTRACT: This study examined the dynamic response of a subsea pipeline under an impact load to determine the effect of the seabed soil. A laboratory-scale soil-based pipeline impact test was carried out to investigate the pipeline deformation/strain as well as the interaction with the soil-pipeline. In addition, an impact test was simulated using the finite element technique, and the calculated strain was compared with the experimental results. During the simulation, the pipeline was described based on an elasto-plastic analysis, and the soil was modeled using the Mohr-Coulomb fail- ure criterion. The results obtained were compared with ASME D31.8, and the differences between the analysis results and the rules were specifically investigated. Modified ASME formulae were proposed to calculate the precise structural behavior of a subsea pipeline under an impact load when considering sand- and clay-based seabed soils. KEY WORDS: Subsea pipeline; Pipe impact test; Pipeline-soil interaction; Pipe deformation; Finite element analysis. INTRODUCTION For the development of oil and gas reserves, a number of subsea pipelines have been installed and are under operation in the oceans around the world, such as in continental shelves and deep water regions. In addition, the installation and operation of subsea pipelines in deep ocean areas are more complicated than in shallow water. The conditions in deep water are extremely harsh. For example, a subsea pipeline should resist approximately 300-400 bar of hydraulic pressure and temperatures of 250- 300 °C. Approximately 50% of the various subsea equipment/facilities around the world have experienced failures in their subsea pipelines in recent decades. A failure accident can be categorized according to its mechanical/chemical aspects: corrosion, fatigue, and impact failures, which are induced by sea water; cyclic loads, such as from currents; and falling objects, such as subsea piles, respectively. Many studies on failure accidents have been carried out. Among them, corrosion and fatigue failures have been widely studied. In particular, many classification society rules have been put in place, and many research papers have been written. Xue (2006) examined the problem of buckle propagation in corroded subsea pipelines, the variation in propagation pressure
Lab-scale impact test to investigate the pipe-soil interaction and comparative study to evaluate structural responses
Jun 30, 2023
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