滚石作用下埋地钢管道动力响应数值模拟分析  

Simulated analysis of the dynamic response of buried steel pipeline to the rolling stone impact

作　　者：姚安林[1] 邢义锋[2] 曾祥国[2] 吴志平 李又绿[1] 赵师平[2] 

机构地区：[1]西南石油大学建筑工程学院,成都610500 [2]四川大学建筑与环境学院,成都610065 [3]中国石油股份公司天然气与管道分公司,北京100011

出　　处：《安全与环境学报》2009年第3期122-125,共4页Journal of Safety and Environment

基　　金：中国石油西气东输管道公司项目(XQSGL01380);国家科技支撑计划项目(2006BAK02B01)

摘　　要：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。This article is focusing on a simulated study of the dynamic response of the multi-system composed of wiling stones, mud and buried pipes to the impact loads through quantitative analysis. As is known, the dynamic response of buried pipes to the impact loads may lead to the collapse of the engineering underground systems. For this purpose, first of all, we have established a mechanical model and a finite element analysis model regarding to the rolling stones, pipeline and mud interaction based on the three-dimensional dynamic contact surface algorithm. And then, we have studied the dynamic response of the buried steel pipes in terms of the initial kinetic energy of the rolling stones, their likely rolling directions, as well as the limited state of the buried pipeline under dynamic impact respectively by means of the finite element software LS-DYNA. The distribution rule of stress and displacement of the buried pipeline under conditions of various impact angles has been obtained. At the same time, we have also worked out the relationship between the initial kinetic energy of the wiling stones and the horizontal distance between the selected point of the rolling stone and the pipeline center under the condition of the pipeline confined state. Finally, the simulated analysis of the impact process of rolling stones shows that the node displacement tends to rise to the maximum value and then rebound after a decrease to a certain value in the impact process, which may provide a significant reference to the risk evaluation, structural design and the disaster prevention.

关 键 词：固体力学 冲击荷载 埋地钢管道 动态响应 数值模拟 

分 类 号：P642.21[天文地球—工程地质学]