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研究滚石-土-埋地钢管道组成的多元体系在冲击荷载作用下的动力响应。依据三维动态接触面算法构建滚石、土体和管道相互作用的力学模型及有限元分析模型,并采用LS-DYNA有限元软件从滚石初动能、冲击夹角、模拟临界状态等方面对滚石冲击荷载作用下埋地钢管道的动力响应进行数值模拟分析。研究得到了管道在滚石垂直或不同冲击角度撞击条件下的应力、位移变化规律,并在管道破坏临界状态下模拟出滚石初动能与滚石落地点距管道中心水平距离的关系。滚石撞击过程中,管道上各节点位移先增加后减小,出现反弹。本研究对埋地钢管道的风险评估、工程设计和防灾减灾具有重要参考价值。
The dynamic response of multicomponent system composed of roller-soil-buried steel pipe under impact load is studied. According to the 3D dynamic contact surface algorithm, the mechanical model and the finite element analysis model of the interaction between stones, soil and pipe are established. The impact load of the rock roll from the initial kinetic energy, the angle of impact and the critical state of simulation by using LS-DYNA finite element software Numerical simulation analysis of dynamic response of buried steel pipe under action. The variation of stress and displacement of the pipeline under the impact of the rolling stone at different vertical or different impact angles was obtained. The relationship between the initial kinetic energy of the rolling stone and the horizontal distance of the rolling stone from the center of the pipeline was simulated under the condition of pipeline damage. During the process of rolling stones, the displacements of all nodes on the pipeline first increase and then decrease, and the rebound occurs. This study has important reference value for the risk assessment, engineering design and disaster prevention and reduction of buried steel pipelines.