Abstract：Submarine pipelines will possibly be damaged by dropped weights from ocean platforms or anchors from ships. The rock armor berm is the method commonly adopted to protect these pipelines by covering them with a layer of gravels, which can dissipate part of the energy of falling objects. In order to estimate the energy dissipating capacity of the rock armor berm, a coupled discrete element method (DEM) and finite element method (FEM) approach is proposed to analyze the dynamic response of pipelines under impact load. In this approach, DEM is used to model discrete gravels and FEM is used to model other continuous objects. The two kinds of elements interact on each other through the contact interface between them. The calculated results of energy absorptions by gravels coincide well with those recommended by the current code of DNV-RP-F107, and the calculated deformation rules of the pipeline are in good agreement with those given by model tests. These results prove the feasibility of using the proposed approach to evaluate the safety of submarine pipelines with rock armor berm.
邱长林, 王菁, 闫澍旺. 冲击荷载作用下有碎石保护结构的海底管线DEM-FEM联合分析研究[J]. 岩土工程学报, 2015, 37(11): 2088-2093.
QIU Chang-lin, WANG Jing, YAN Shu-wang. Coupled DEM-FEM analysis of submarine pipelines with rock armor berm under impact load. Chinese J. Geot. Eng., 2015, 37(11): 2088-2093.
[1] MACDONALD K A, COSHAM A, ALEXANDER C R, et al. Assessing mechanical damage in offshore pipelines-two case studies[J]. Engineering Failure Analysis, 2007, 14(8): 1667-1679. [2] WIERZBICKI T, SUH M S. Indentation of tubes under combined loading[J]. International Journal of Mechanical Sciences, 1988, 30(3/4): 229-248. [3] ZEINODDINI M, HARDING J E, PARKE G A R. Effect of impact damage on the capacity of tubular steel members of offshore structures[J]. Marine Structures, 1998, 11(4/5): 141-157. [4] 杨秀娟, 修宗祥, 闫相祯, 等. 海底管道受坠物撞击的三维仿真研究[J]. 振动与冲击, 2009, 28(11): 47-50. (YANG Xiu-juan, XIU Zong-xiang, YAN Xiang-zhen, et al. 3D simulation of submarine pipeline impacted by dropped objects[J]. Journal of Vibration and Shock, 2009, 28(11): 47-50. (in Chinese)) [5] 黄小光, 孙 峰. 基于ANSYS/LS-DYNA的海底管道受抛锚撞击动力学仿真[J]. 中国海洋平台, 2012, 27(5): 41-44. (HUANG Xiao-guang, SUN Feng. Application of ANSYS/LS-DYNA in dynamic simulation of submarine pipeline in impacted by an anchor[J]. China Offshore Platform, 2012, 27(5): 41-44. (in Chinese)) [6] DET NORSKE V. Recommended practice DNV-RP-F107 risk assessment of pipeline protection[M]. Norske: Det Norske Verttas, 2010. [7] 闫澍旺, 禚瑞花, 王武刚, 等. 冲击荷载作用下岩土材料能量耗散的有限元分析[J]. 工程力学, 2013, 30(5): 160-164. (YAN Shu-wang, ZHUO Rui-hua, WANG Wu-gang, et al. Finite element analysis on energy dissipation of geo-materials incurred by impacting load[J]. Engineering Mechanics, 2013, 30(5): 160-164. (in Chinese)) [8] 杨秀娟, 闫 涛, 修宗祥, 等. 海底管道受坠物撞击时的弹塑性有限元分析[J]. 工程力学, 2011, 28(6): 189-194. (YANG Xiu-juan, YAN Tao, XIU Zong-xiang, et al. Elastic-plastic finite element analysis of submarine pipeline impacted by dropped objects[J]. Engineering Mechanics, 2011, 28(6): 189-194. (in Chinese)) [9] 李鹏飞, 严 颖, 季顺迎. 颗粒物质缓冲性能的离散元模拟[M]// 颗粒材料计算力学研究进展. 大连: 大连理工大学出版社, 2012: 189-195. (LI Peng-fei, YAN Ying, JI Shun-ying. Discrete element simulation of impact-absorbing capacity of granular materials[M]// Advances in Computational Mechanics of Granular Materials. Dalian: Dalian University of Technology Press, 2012: 189-195. (in Chinese)) [10] TIMOSHENKO S P, GOODIER J N. Theory of elasticity[M]. 2nd ed. New York: McGraw-Hill Book Company Inc., 1951. [11] HAFF P K, ANDERSON R S. Grain scale simulations of loose sedimentary beds: the example of grain-bed impact in Aeolian saltation[J]. Sedimentology, 1993, 40: 175-198. [12] 陈国兴. 岩土地震工程学[M]. 北京: 科学出版社, 2007. (CHEN Guo-xing. Geotechnical earthquake engineering[M]. Beijing: Science Press, 2007. (in Chinese))
