摘要
煤层采空区输气管道的变形与损伤评估主要依赖现场监测与定期开挖,成本较高且难以实现对变形演化规律的精准预测,无法满足管道长期安全管理需求。采用数值模拟或实验方法深入分析地层运动及管道力学响应,并制定针对性防护措施,对于保障管道结构安全具有重要工程意义。因此,构建了一种基于相似材料实验的煤层采空区管道变形研究方法。为提高实验的可靠性,选取典型地质工况,构建二维相似模型,采用“移架+放顶”工艺模拟煤层开采过程,并利用多源监测手段采集管道的应力与变形数据。结合实验结果,分析管道与地表的非协调变形规律,并探讨损伤累积机理。结果表明,管道的垂向变形与地表沉降基本协调,但水平变形滞后显著,导致局部应力集中和损伤累积,这成为管道失效的主要诱因。基于此,提出开挖释放应力、抬管操作及断管改线等防控策略,可为煤层采空区输气管道的安全管理提供理论支持和工程指导。
The deformation and damage assessment of gas pipelines in coal seam goaf primarily relies on on-site monitoring and periodic excavation inspections.However,this approach that is costly and fails to accurately predict the evolution of pipeline deformation can’t meet the long-term safety management requirements of pipelines.Conducting in-depth analyses of stratum movement and the mechanical responses of pipelines through numerical simulations or experimental studies as well as developing targeted protective measures are of significant engineering importance for ensuring pipeline structural stability.The paper develops a research method for pipeline deformation in coal seam goaf based on similar material experiments,selects a typical geological condition and constructs a two-dimensional similar model to enhance the reliability of the experiments,simulates the coal seam mining process using the“support withdrawal+roof caving”process,collects stress and deformation data of pipelines by multi-source monitoring techniques,analyzes the non-coordinated deformation patterns between pipelines and the ground surface based on the experimental results,and discusses the mechanism of damage accumulation.The results indicate that the vertical deformation of the pipeline is generally consistent with surface subsidence but horizontal deformation lags significantly leading to localized stress concentration and damage accumulation, which is the primary causes of pipeline failure. Accordingly, it proposes such prevention measures as stress release through excavation, pipeline elevation adjustments, and disconnecting and rerouting to provide theoretical support and engineering guidance for the safety management of gas pipelines in coal seam goaf.
作者
郭文朋
赵桓宇
梁凯
申倬伟
张俊
赵媛
石悦
邱睿
GUO Wenpeng;ZHAO Huanyu;LIANG Kai;SHEN Zhuowei;ZHANG Jun;ZHAO Yuan;SHI Yue;QIU Rui(Shanxi Natural Gas Co.,Ltd.,Taiyuan 030032,China;Shanxi Huaxin City Gas Group Co.,Ltd.,Taiyuan 030032,China;College of Artificial Intelligence,China University of Petroleum(Beijing),Beijing 102249,China;National Engineering Laboratory for Pipeline Safety,MOE Key Laboratory of Petroleum Engineering,Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum(Beijing),Beijing 102249,China;Department of Energy Engineering,Shanxi Institute of Energy,Jinzhong 030600,China)
出处
《油气与新能源》
2025年第3期63-70,共8页
Petroleum and new energy
基金
新疆天山创新团队“油气高效管输技术研究与应用创新团队”(2022TSYCTD0002)。
关键词
输气管道
煤层采空区
相似材料模拟
力学响应
防控策略
Natural gas pipeline
Coal seam goaf
Similar material simulation
Mechanical response
Prevention strategies
