爆炸荷载下聚脲涂覆含局部缺陷油气管道的失效判定研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 195-203.

论文

崔莹1,2，李章剑2,3，方军2,3，赵均海4，屈展1,2，赵奔2,3

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Failure determination of polyurea coated oil and gas pipelines with local defects under blast load

CUI Ying1,2, LI Zhangjian2,3, FANG Jun2,3, ZHAO Junhai4, QU Zhan1,2, ZHAO Ben2,3

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摘要

通过埋地静爆试验，对经聚脲弹性体材料加固的含局部缺陷埋地油气管道抗爆性能及损伤评价进行研究，同时结合所得试验数据进行数值模拟，建立了浅埋爆炸荷载下聚脲弹性体材料加固含局部缺陷埋地油气管道损伤失效评估准则。结果表明：在折合距离为0.23m/kg1/3试验条件的浅埋爆炸荷载作用下，含局部缺陷普通管道与含局部缺陷聚脲管道迎爆面均发生了明显凹陷变形，含缺陷聚脲管道凹陷变形量较前者降低28.87%，且管道迎爆面及端部连接处易于遭受损伤；含局部缺陷普通管道迎爆面超压高于含局部缺陷聚脲管道且变形响应时间早于后者，表明聚脲材料可以有效降低爆炸冲击波压力峰值和推迟爆炸冲击波的作用时间。在进行爆炸荷载作用下管道的损伤失效判定时引入衡量管道横截面变形的截面临界椭圆度指标，最终建立了基于管道截面临界椭圆度的聚脲涂覆含局部缺陷埋地油气管道的超压-冲量（P-I）损伤准则及判定公式。

Abstract

With buried blast experiment, the anti-explosion performance of polyurea elastic reinforcement buried petroleum pipeline with localized defects was researched thoroughly. Furthermore, with the experimental data and numerical simulation, the damage assessment criterion of polyurea elastic reinforcement buried petroleum pipeline with localized defects subjected to shallow buried blast loading was established. The results show that under the condition of scale distance of 0.23m/kg1/3 and shallow buried blast loading exerted on, there were obvious dent deformations on the surface facing the blasting of the normal buried pipeline with localized defects and the polyurea buried petroleum pipeline with localized defects both, and the dent deformation values of the polyurea pipeline with localized defects was 28.87% lower than that of the normal buried pipeline. It was venerable to have damage on the buried pipeline surface facing explosive and joint ends of buried pipeline. According to the comparison of the overpressure, the values of the normal buried pipeline with localized defects was higher than that of the polyurea enhanced one, and the beginning time of deformation of the normal buried pipeline with localized defects was earlier than that of the polyurea enhanced one, which indicated that the polyurea could decrease the value of overpressure and delay the response time effectively. Finally, considering the calculation of cross-section ellipticity of pipeline cross-section deformation for failure determination, the damage assessment formula based on a new critical ellipticity of pipeline cross-section had been established according to pressure and impulse (P-I) damage assessment theory.

导出引用

崔莹1,2，李章剑2,3，方军2,3，赵均海4，屈展1,2，赵奔2,3. 爆炸荷载下聚脲涂覆含局部缺陷油气管道的失效判定研究[J]. 振动与冲击, 2024, 43(9): 195-203

CUI Ying1,2, LI Zhangjian2,3, FANG Jun2,3, ZHAO Junhai4, QU Zhan1,2, ZHAO Ben2,3. Failure determination of polyurea coated oil and gas pipelines with local defects under blast load[J]. Journal of Vibration and Shock, 2024, 43(9): 195-203

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