【摘要】 针对采空区地质沉降对埋地输气管道带来的安全问题，以补连塔煤矿及上覆管道为研究对象，采用实体单元构建三维数值模型，研究不同管沟开挖方式下管道的回弹效果和应力变化，分析在不同采空区宽度下，管沟的最佳开挖长度。结果表明：纵深开挖管沟方式优于沿管道开挖；采空区宽度越大，对管道破坏力越强；管沟开挖长度越大，管道的应力集中效应越不明显；对于近水平煤层采空区，管沟最佳开挖长度与采空区宽度相同。更多还原

【Abstract】 Aiming at the safety problems caused by the geological settlement of goaf on the buried gas transmission pipeline, taking Bulianta coal mine and the overlaying pipeline as the research object, a three-dimensional numerical model was constructed with solid elements to study the resilience effect and stress change of the pipeline under different excavation methods, and to analyze the optimal excavation length of the pipeline under different goaf widths. The results show that the deep excavation method is better than the excavation along the pipeline; the larger the width of the goaf, the stronger the destructive power to the pipeline. The greater the length of pipe trench excavation, the less obvious the stress concentration effect. For the goaf of near horizontal coal seam, the optimal excavation length of pipe trench is the same as the width of the goaf.更多还原