冲击荷载作用下埋地长输管道受力性能分析
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摘要
为研究冲击荷载作用下埋地长输管道的受力性能,制作一个土箱—管道缩尺模型,进行落锤冲击试验,并建立落锤冲击埋地管道的有限元计算模型,对管道动态响应过程进行数值模拟。主要分析了管道壁厚、管径、埋深和冲击能量等参数对管道受力性能的影响,探讨埋地长输管道在冲击荷载作用下的整体变形特点和应变分布规律。研究结果表明:在冲击荷载作用下,冲击能量增加,管道跨中表面的应变峰值增大;相同工况下大管径和薄壁管道应变值大,管道覆土越深,管道应变峰值越小,土体的缓冲作用削弱了管道受到的冲击作用;通过有限元模拟结果与试验结果对比分析,两者一致性较好,故在实际工况下可用有限元模拟落石对埋地管道的冲击作用。
To study the stress performance of buried long distance pipeline under the impact of rockfall, a drop hammer impact test is carried out by a scale combination model of soil box and pipeline.And the dynamic response process of the pipeline is simulated by establishing the finite element calculation model of the buried pipeline with falling hammer impacts.The influences of parameters such as pipe wall thickness, pipe diameter, buried depth and impact energy on the mechanical behavior of the pipeline are analyzed, and the overall deformation characteristics and strain distribution of the buried long-distance pipeline under impact loading are discussed.The results show that the peak strain of the midsoan surface of the pipe increases with the increase of the impact energy in the impact loading area, and the peak strains for the large-diameter and thin-walled pipelines change greatly under the same working conditions.The deeper soil covering for the pipeline will result in the smaller strains of the pipeline, and the cushioning effect of the soil weakens the impact on the pipeline.By comparing the results of the finite element simulation with the test results, the good consistency between the two is observed.Therefore, the impact of rockfall on buried pipelines can be well simulated by finite element method under actual working conditions.
To study the stress performance of buried long distance pipeline under the impact of rockfall, a drop hammer impact test is carried out by a scale combination model of soil box and pipeline.And the dynamic response process of the pipeline is simulated by establishing the finite element calculation model of the buried pipeline with falling hammer impacts.The influences of parameters such as pipe wall thickness, pipe diameter, buried depth and impact energy on the mechanical behavior of the pipeline are analyzed, and the overall deformation characteristics and strain distribution of the buried long-distance pipeline under impact loading are discussed.The results show that the peak strain of the midsoan surface of the pipe increases with the increase of the impact energy in the impact loading area, and the peak strains for the large-diameter and thin-walled pipelines change greatly under the same working conditions.The deeper soil covering for the pipeline will result in the smaller strains of the pipeline, and the cushioning effect of the soil weakens the impact on the pipeline.By comparing the results of the finite element simulation with the test results, the good consistency between the two is observed.Therefore, the impact of rockfall on buried pipelines can be well simulated by finite element method under actual working conditions.
引文
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[2] 王洪波,张学增,王鹏,等.冲击荷载作用下埋地管道基于应变的力学分析[J].石油工程建设,2009,35(5):1-4.
[3] 刘爱文.基于壳模型的埋地管线抗震分析[D].哈尔滨:中国地震局地球物理研究所,2002.
[4] CHIOU Y,CHI S.Numerical modelling for buckling of buried pipelinesinduced by compressive ground failure[J].Journal of the Chinese Institute of Engineers,1996,19(3):321-332.
[5] 荆宏远.落石冲击下浅埋管道动力学响应分析与模拟[D].武汉:中国地质大学,2007.
[6] 邢义锋,姚安林,曾祥国,等.滚石作用下钢质管道动力响应分析及其应用[J].工业建筑,2009,39(增刊1):462-465.
[7] 赵师平,曾祥国,姚安林,等.第三方载荷作用下埋地输气管道动力响应的数值模拟[J].四川建筑科学研究,2009,35(1):134-139.
[8] 丁凤凤,石豫川,冯文凯.埋地管道在落石冲击作用下的数值模拟[J].山西建筑,2009,35(30):87-88.
[9] 佘艳华.机械冲击荷载对邻近埋地管道的影响及控制研究[D].四川绵阳:中国工程物理研究院,2012.
[10] 寇忠.油气长输管道常用管径研究[J].石油规划设计,2005,16(3):16-18.
[11] 中国石油天然气集团公司.油气输送管道线路工程抗震技术规范:GB 50470—2008[S].北京:中国计划出版社,2008.
[12] 曲勰,黄茂松,吕玺琳.基于非局部Mohr-Coulomb模型的土体渐进破坏分析[J].岩土工程学报,2013,35(3):523-530.
[13] 曾希,董飞飞,廖恒,等.跨断层埋管力学行为的多参数模拟分析[J].武汉大学学报(工学版),2017,50(6):874-880.
[14] VAZOURAS P,KARAMANOS S A,DAKOULASP.Finite element analysis of buried steel pipelines under strike-slip fault displacements[J].Soil Dynamics & Earthquake Engineering,2010,30(11):1361-1376.
[15] 聂肖虎,刘传奇,朱秀星.落石冲击载荷作用下大口径埋地管道应变规律研究[J].石油化工设备技术,2011,32(5):26-30.
[16] 赵敏.土体沉陷时埋地管线力学性状的有限元分析[D].北京:中国石油大学,2016.
[17] 杜国锋,宋鑫.埋地天然气管道地震反应数值模拟分析[J].石油天然气学报,2012,34(3):157-160.
[18] XU T,ZENG X,YAO A,et al.Reliability analysis of buried gas pipeline under ramming impact loading[J].Journal of Sichuan University (Engineering Science Edition),2012,44(2):96-100.