重型车辆碾压下埋地X70管道力学响应

1.中国石油大学(华东)储运与建筑工程学院;2.国家石油天然气管网集团有限公司;3.国家管网集团西南管道有限责任公司贵阳输油气分公司

埋地管道;车辆碾压;室外实验;有限元仿真;力学响应

Mechanical response of buried X70 pipelines rolled by heavy-duty vehicles
LI Yukun1,DONG Zhuang1,CHANG Jinglong2,PEI Chenliang1,ZHOU Peng1,YANG Ao1,LI Hongtao3,LI Wang3

1.College of Pipeline and Civil Engineering, China University of Petroleum (East China); 2.China Oil & Gas Pipeline Network Corporation; 3.Guiyang Oil and Gas Transportation Branch, PipeChina Southwest Pipeline Co. Ltd.

buried pipeline, vehicle rolling, field test, finite element simulation, mechanical response

DOI: 10.6047/j.issn.1000-8241.2024.04.006

备注

【目的】随着中国城镇化建设的不断推进,重型车辆通过埋地管道上方的情况日益增多,探究重型车辆碾压下埋地管道力学响应规律对保障油气管道安全运行具有重要意义。【方法】以埋地X70管道为研究对象,设计并开展车辆碾压管道室外实验,采用应变电测法获取管道响应数据,总结管道土压力和轴向应力的响应规律;使用ABAQUS软件建立土体-管道有限元仿真模型,采用非线性接触模型模拟管土相互作用,将车辆荷载简化为移动面源恒载,编写DLOAD子程序实现加载,按照实验工况进行仿真。【结果】所得管道附加轴向应力的仿真值与实验值偏差小,且土压力、轴向应力分布规律与试验结果相同,验证了管道土压力、轴向应力的响应规律;基于验证后的有限元模型,采用单一变量法,通过仿真探讨了车辆载重、车辆速度、管道直径、管道壁厚、填土高度与管道内压6种参数对管道轴向应力的影响规律。【结论】两侧履带正下方截面处管顶土压力和轴向应力均大于中心截面处,管底轴向应力小于中心截面处。增大管道直径、管道壁厚或填土高度均可减小车辆碾压引起的管道附加轴向应力,但改变车辆速度与管道内压对管道附加轴向应力无显著影响。研究所得埋地管道力学响应规律可为重型车辆碾压下管道的安全裕度评估提供参考。(图 20表4,参[27]
[Objective] With the ongoing urbanization in China, the frequency of heavy-duty vehicles traversing buried pipelines is steadily increasing. Therefore, it is of paramount importance to investigate the mechanical response patterns of buried pipelines subjected to heavy-duty vehicle rolling in order to ensure the safety of oil and gas pipelines. [Methods] Field tests were conducted to investigate the rolling of heavy-duty vehicles on a buried X70 pipeline. Strain gauge technology was employed to gather pipeline response data and summarize the response patterns of soil pressure and axial stress. Additionally, an ABAQUS software-based finite element simulation model was established to simulate the soil-pipeline interaction using a nonlinear contact model. The vehicle load was simplified as the dead load of a moving plane source, and a DLOAD subprogram was developed to implement the loading. Subsequently, simulations were conducted based on the test conditions. [Results] The results demonstrated a negligible deviation between the simulated and tested values of the additional axial stress in the pipeline. Furthermore, the simulated distribution patterns of soil pressure and axial stress aligned with those observed in the tests, thus the response patterns of soil pressure and axial stress were verified. Based on the verified finite element model, the impact of six parameters, i.e., vehicle load, vehicle speed, pipe diameter, pipe wall thickness, fill height, and pipeline internal pressure, on the axial stress of the pipeline was explored through simulation by employing a single-variable approach. [Conclusion] The topsoil pressure and axial stress at the section beneath the crawler belts on both sides are higher than those at the central section. Conversely, the bottom axial stress is lower than that at the central section. Augmenting the pipe diameter, pipe wall thickness, or fill height can diminish the additional axial stress induced by vehicle rolling on the pipeline. However, altering the vehicle speed and pipeline internal pressure does not yield significant effects on the axial stress. The obtained mechanical response patterns of the buried pipeline can be used as a reference for evaluating the safety margin of pipelines under heavy-duty vehicle rolling. (20 Figures, 4 Tables, 27 References)
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