车-路-土耦合作用下聚乙烯燃气管道的失效特性

兰州理工大学学报 ›› 2025, Vol. 51 ›› Issue (5): 62-71.

车-路-土耦合作用下聚乙烯燃气管道的失效特性

郭凯^*1, 尤学升¹, 凌晓¹, 孙宝财², 杨凯¹, 刘晓雅¹

1.兰州理工大学石油化工学院, 甘肃兰州 730050;
2.甘肃省特种设备检验检测研究院, 甘肃兰州 730050

收稿日期:2023-07-07 发布日期:2025-10-25
通讯作者: 郭凯(1989-),男,甘肃酒泉人,副教授. Email:guokailut@163.com
基金资助:
国家自然科学基金(52204074),甘肃省科技专员专项(23CXGA0053),甘肃省自然科学基金(21JR7RA221),甘肃省重点研发计划-工业类(22YF11GA316)

Failure characteristics of polyethylene gas pipeline undervehicle-pipe-soil coupling

GUO Kai¹, YOU Xue-sheng¹, LING Xiao¹, SUN Bao-cai², YANG Kai¹, LIU Xiao-ya¹

1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Gansu Province Special Equipment Inspection and Testing Institute, Lanzhou 730050, China

Received:2023-07-07 Published:2025-10-25

摘要/Abstract

摘要： 车载作用下,含划痕缺陷的埋地聚乙烯燃气管道易发生应力集中,这将加快管道的破坏,从而导致管道失效及引发燃爆事故.基于作用力传递分析,建立了阐释车载、土壤、含划痕缺陷聚乙烯管道作用路径的非线性力学耦合模型,分析了载荷、内压、埋深、土壤弹性模量以及划痕深度对管道的影响.结果表明:考虑土体自重情况下,含划痕管道在缺陷区产生应力集中,管道Mises应力与载荷、内压、埋深和缺陷深度的变化成正比,与土壤的弹性模量成反比;车载为5.75 MPa或内压为0.24 MPa时,管道最大Mises应力达到许用应力,内压为0.52 MPa时,管道达到屈服强度而失效;划痕深度较浅时,管道破坏始于划痕前缘中间部分,当缺陷深度与管道壁厚之比a/t≥0.4时,应力集中发生在划痕端点,破坏始于划痕两端.

关键词: 划痕缺陷, 聚乙烯燃气管道, 作用力传递, 耦合, 埋地管道

Abstract: The buried polyethylene gas pipeline with scratches is prone to stress concentration under vehicle-mounted action, which speed up the damage of the pipeline, resulting in pipeline failure and ignition and explosion accidents. Based on the force transfer analysis, a nonlinear mechanical coupling model was established to explain the action path of vehicle-mounted, soil-scratched polyethylene pipe. The effects of load, internal pressure, buried depth, soil elastic modulus, and scratch depth on the pipe were analyzed. The results show that stress concentration occurs in the defect area of the scratched pipeline. The Mises stress is directly proportional to the changes of load, internal pressure, buried depth, and defect depth, and inversely proportional to the elastic modulus of soil under the condition of soil dead weight. When the Mises stress was 5.75 MPa or the internal pressure was 0.24 MPa, the maximum Mises stress reached the allowable stress. At an internal pressure of 0.52 MPa, the pipeline reached the yield strength and failed. When the scratch depth is shallow, the pipe failure starts from the middle part of the scratch front. When the ratio of the defect depth to the pipe wall thickness is a/t≥0.4, the stress concentration occurs at the end of the scratch, and the failure starts from both ends of the scratch.

Key words: scratch defect, polyethylene gas pipeline, force transfer, coupling, buried pipelines

中图分类号:

TE832

郭凯, 尤学升, 凌晓, 孙宝财, 杨凯, 刘晓雅. 车-路-土耦合作用下聚乙烯燃气管道的失效特性[J]. 兰州理工大学学报, 2025, 51(5): 62-71.

GUO Kai, YOU Xue-sheng, LING Xiao, SUN Bao-cai, YANG Kai, LIU Xiao-ya. Failure characteristics of polyethylene gas pipeline undervehicle-pipe-soil coupling[J]. Journal of Lanzhou University of Technology, 2025, 51(5): 62-71.

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