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冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 1099-1105.doi: 10.7522/j.issn.1000-0240.2016.0128

• 寒旱区重大工程问题 • 上一篇    下一篇

寒区输油管道基于应变设计的极限状态研究

李国玉, 马巍1, 周志伟1, 金会军1, 张鹏2   

  1. 1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;
    2. 南京工业大学 交通学院, 江苏 南京 210009
  • 收稿日期:2016-03-20 修回日期:2016-07-29 出版日期:2016-08-25 发布日期:2016-09-19
  • 作者简介:李国玉(1975-),男,研究员,2007年在中国科学院寒区旱区环境与工程研究所获博士学位,现从事冻土力学、寒区岩土工程与环境等方面的研究.E-mail:guoyuli@lzb.ac.cn
  • 基金资助:
    国家重点基础研究发展计划(973计划)项目(2012CB026106);国家自然科学基金项目(41672310);冻土工程国家重点实验室自主课题(SKLFSE-ZY-11;SKLFSE-ZY-16);中国科学院西部之光重点项目(李国玉);中国科学院寒区旱区环境与工程研究所STS项目(HHS-TSS-STS-1502);冻土工程国家重点实验室开放基金项目(SKLFSE201302)资助

The limit state of pipeline based on strain design in cold regions

LI Guoyu, MA Wei1, ZHOU Zhiwei1, JIN Huijun1, ZHANG Peng2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. College of Transportation Science & Engineering, Nanjing University of Technology, Nanjing 210009, China
  • Received:2016-03-20 Revised:2016-07-29 Online:2016-08-25 Published:2016-09-19

摘要: 寒区输油管线沿线地质环境复杂,滑坡、冻胀、融沉等自然灾害会导致管道形成大差异变形量.而差异变形量所引起的应力应变行为直接影响管道的安全服役性能,严重时会使管道破坏失效.基于寒区输油管道在实际服役工况下的受力变形条件,充分考虑冻胀效应、油压效应和热应力效应对输油管道的影响,分析了不同长度、壁厚、油压条件下轴向拉伸应变的分布规律及其影响因素.基于轴向应变设计理论准则,建立了上述条件下输油管道的极限服役状态,得到了对应状态下输油管道的许应最大极限冻胀变形量.结果分析表明,采用基于应力的设计准则偏保守,采用基于轴向应变的设计准则能更多的利用管材的变形性能.可为管道的合理设计、安全评价、完整性管理提供一定的理论参考.

关键词: 寒区输油管道, 应变设计准则, 冻胀变形量, 极限状态

Abstract: Complex geological environment along the pipeline in cold regions, such as landslides, the frost heave and thawing settlement, probably makes the pipe a large differential deformation leading to its failure. Large differential deformation caused by the stress and strain behavior directly affects the safety of pipeline during operation, and even damages the pipe. Based on the actual stress/strain conditions of oil pipeline in cold regions, we fully considered the frost heave, oil pressure and thermal stress effects on the pipeline, and analyzed its factors and the axial tensile strain distribution with different lengths, thicknesses, oil pressures. According to axial strain design criterion, the limit conditions of the oil pipelines were established. The maximum limit of the frost heave deformation for pipelines was obtained. Results show that the stress-based design criteria is conservative, and the strain-based design can use the deformation of the pipes more efficiently. This article can provide references for the reasonable design, safety evaluation and integrity management of pipeline.

Key words: oil pipeline in cold regions, strain-based design criteria, frost heave, limit state

中图分类号: 

  • P642.14