| 基于有限元的局部突变位移载荷下埋地管道力学分析 |
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| 引用本文： | 吴锴,张宏.基于有限元的局部突变位移载荷下埋地管道力学分析[J].中国安全生产科学技术,2019,15(4):59-64. |
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| 作者姓名： | 吴锴 张宏 |
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| 作者单位： | （1. 中国石油大学（北京） 安全与海洋工程学院，北京 102249;2. 中国石油大学（北京） 机械与储运工程学院，北京 102249） |
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| 基金项目： | 基金项目: 国家重点研发计划项目（2016YFC0802105）； 中国石油大学（北京）科研基金项目（2462018YJRC019） |
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| 摘 要： | 冻土融沉、盐渍土溶陷等地质灾害会导致局部土壤产生一定位移，对埋地长输管道安全性构成威胁。为保障埋地管道的安全运行，建立了局部突变型位移载荷作用下埋地管道力学分析模型，采用非线性土弹簧描述管土相互作用，分析了局部突变区域长度及突变位移量对埋地管道受力的影响。研究结果表明:因局部突变区长度与突变位移量的不同，管道存在3种受力状态，当局部突变区域长度大于临界突变区长度时，管道轴心应变与弯曲应变在突变区域内不产生耦合，此时在突变区域两端可等效为2个垂直正断层，即为第一种受力状态；当突变区域长度小于临界突变区长度时，随着突变位移的增加，管道应变随之增加，管道轴心应变与弯曲应变在突变区域内不断叠加，即为第二种受力状态；在第二种受力状态基础上，当突变位移大于临界突变位移时，管道应变不再发生变化，管道等效为受到垂向均布荷载的作用，即为第三种受力状态。研究结果可为工程中管道穿越地质灾害区域的设计提供参考。
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| 关 键 词： | 突变型 位移荷载 埋地管道 力学响应 有限元方法 |
Finite element analysis of the buried pipelines subjected to abrupt displacement load locally |
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| WU Kai,ZHANG Hong.Finite element analysis of the buried pipelines subjected to abrupt displacement load locally[J].Journal of Safety Science and Technology,2019,15(4):59-64. |
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| Authors: | WU Kai ZHANG Hong |
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| Affiliation: | （1. College of Safety and Ocean Engineering, China University of Petroleum（Beijing）, Beijing 102249, China;2. College of Mechanical and Transportation Engineering, China University of Petroleum（Beijing）, Beijing 102249, China) |
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| Abstract: | Geological disasters such as thawing settlement of the frozen soil, melt sinking of the saline soil, which may cause displacement of local soil, are a primary threat to the integrity of the pipeline, and can also cause catastrophic consequence in serious accidents. In order to ensure the safe operation of the buried pipeline, a numerical model simulating the buried pipeline under the local displacement of soil in geological hazards was established by using finite element method, where the nonlinear spring was used to simulate the interaction between the pipe and soil. Effects of the local abrupt zone length as well as the soil displacement on mechanical conditions of pipeline were discussed in detailed. The results show that different abrupt zone lengths and soil displacements lead to three different kinds of mechanical conditions. When the local abrupt zone length is larger than the critical value, there is no interaction between axial strain and bending strain, and the geological hazard could be divided into two vertical normal fault at two sides of the abrupt zone, which results in independence between the strain and the value of abrupt zone length. This condition can be defined as the first condition. When the abrupt zone length is shorter than the critical value, the value of pipe strain increases with the increasing of the soil displacement, the axial strain and bending strain of pipeline are superimposed continuously in the abrupt region, and it is called the second condition. Based on the second state, when the abrupt displacement increases to the critical abrupt displacement, the strain of the pipeline will be no longer changed, and the pipeline is equivalent to being subjected to the uniform load, which can be defined as the third condition. |
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| Keywords: | abrupt displacement displacement load buried pipeline mechanical response finite element |
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