\r杨政龙^{1, 2}，余建星^{1, 2}，陈海成^{1, 2}，余 杨^{1, 2}，段晶辉\r^{1, 2}\r
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AuthorsHTML:\r杨政龙^{1, 2}，余建星^{1, 2}，陈海成^{1, 2}，余 杨^{1, 2}，段晶辉\r^{1, 2}\r
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AuthorsListE:\rYang Zhenglong^{1, 2}，Yu Jianxing^{1, 2}，Chen Haicheng^{1, 2}，Yu Yang^{1, 2}，Duan Jinghui\r^{1, 2}\r
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AuthorsHTMLE:\rYang Zhenglong^{1, 2}，Yu Jianxing^{1, 2}，Chen Haicheng^{1, 2}，Yu Yang^{1, 2}，Duan Jinghui\r^{1, 2}\r
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Unit:\r1. 天津大学水利工程仿真与安全国家重点实验室，天津 300072；
2. 高新船舶与深海开发装备协同创新中心，上海 200240\r
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Unit_EngLish:\r1. State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300072，China；
2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China\r
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Abstract_Chinese:\r水下落物撞击是海底管道的主要事故形式之一，而深水环境下的落物撞击是高静水压联合落物冲击载荷作用下的结构响应过程．采用LS-DYNA 有限元软件建立了管道、海床数值模型，模拟外界水压和冲击载荷联合作用下结构动态响应过程，并通过全尺寸落物撞击实验结果验证了模型方法的可靠性．利用验证的模型方法，研究了外界水压对管道碰撞损伤及屈曲失稳的影响.研究表明：落物撞击主要对管道结构的初始稳定性造成影响，静水压力的附加做功加剧了管道的局部塑性变形．同时，随着外界水压增大，碰撞初始阶段的塑性变形越大，甚至在高静水压作用下发生即刻的屈曲失稳破坏．研究结果对复杂动力载荷作用下深海管道结构安全评估具有一定的参考价值．\r
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Abstract_English:\rThe impact of a dropped objects under water is one of the main forms of submarine pipeline accidents. While in deep water，the submarine pipelines suffers the combined effect of a high hydrostatic pressure and the impact load. A numerical model of the pipeline and seabed is established using LS-DYNA finite element software，that simulates the dynamic response process of structure under the combined action of the external hydrostatic pressure and impact load. The simulations are verified by the results of full-scale dropped object impact tests. The effect of external hydrostatic pressure on the collision damage and buckling of the pipe is studied by the verified model. The results show that the impact of falling objects mainly affects the initial stability of pipeline structure. Meanwhile，the additional work of hydrostatic pressure increases the local plastic deformation of the pipe. The plastic deformation at the initial stage of the collision becomes more serious with the increase of external hydrostatic pressure，and buckling even occurs instantaneously when the pipeline is exposed to a high enough hydrostatic pressure. The research results provide reference for the safety assessment of deep-sea pipeline structures under complex dynamic loading.\r
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Keyword_Chinese:海底管道；凹陷；落物；屈曲\r

Keywords_English:submarine pipeline；dent；dropped objects；buckling\r


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