FLOW-PIPE-SEEPAGE COUPLING ANALYSIS OF SPANNING INITIATION OF A PARTIALLY-EMBEDDED PIPELINE

作     者：GAO Fu-ping LUO Cheng-cai GAO Fu-ping Key Laboratory for Hydrodynamics and Ocean Engineering,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China LUO Cheng-cai Centre for Offshore Foundation Systems,The University of Western Australia,Nedlands,WA 6907,Australia

作者机构：Key Laboratory for Hydrodynamics and Ocean Engineering Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Centre for Offshore Foundation Systems The University of Western Australia Nedlands WA 6907 Australia 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2010年第22卷第4期

页      面：478-487页

核心收录：

学科分类：08[工学] 081402[工学-结构工程] 080104[工学-工程力学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0814[工学-土木工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10532070) the Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. KJCX2-YW-L02) 

主　　题：submarine pipeline pipeline spanning seepage failure flow-pipe-seepage coupling 

摘      要：The initiation of pipeline spanning involves the coupling between the flow over the pipeline and the seepage-flow in the soil underneath the pipeline.The pipeline spanning initiation is experimentally observed and discussed in this article.It is qualitatively indicated that the pressure-drop induced soil seepage failure is the predominant cause for pipeline spanning initiation.A flow-pipe-seepage sequential coupling Finite Element Method（FEM） model is proposed to simulate the coupling between the water flow-field and the soil seepage-field.A critical hydraulic gradient is obtained for oblique seepage failure of the sand in the direction tangent to the pipe.Parametric study is performed to investigate the effects of inflow velocity,pipe embedment on the pressure-drop,and the effects of soil internal friction angle and pipe embedment-to-diameter ratio on the critical flow velocity for pipeline spanning initiation.It is indicated that the dimensionless critical flow velocity changes approximately linearly with the soil internal friction angle for the submarine pipeline partially-embedded in a sandy seabed.