煤炭工程 ›› 2025, Vol. 57 ›› Issue (8): 138-145.doi: 10. 11799/ ce202508019

• 研究探讨 • 上一篇    下一篇

浅埋深特厚煤层综放开采地表沉陷规律研究

郭文砚,李杰,孟海翔,令春伟   

  1. 1. 煤炭科学技术研究院有限公司,北京 100013

    2. 平鲁区茂华下梨园煤业有限公司,山西 朔州 036800

  • 收稿日期:2024-09-09 修回日期:2025-01-10 出版日期:2025-08-11 发布日期:2025-09-11
  • 通讯作者: 郭文砚 E-mail:1375291076@qq.com

Surface subsidence law caused by fully mechanized top-coal caving in shallow-buried extra-thick coal seam

  • Received:2024-09-09 Revised:2025-01-10 Online:2025-08-11 Published:2025-09-11

摘要:

针对下梨园矿区浅埋深特厚煤层综放开采地表变形破坏复杂和缺少地表沉陷规律实测研究的问题,通过40201工作面地表现场实测和理论分析相结合的研究方法,分析地表移动破坏形式和分区时空特征,总结了该矿地质采矿条件下地表沉陷规律,优化浅埋深特厚煤层开采地表移动变形预计方法。研究结果表明:浅埋深特厚煤层开采地表移动变形剧烈,地表下沉盆地快速形成。下沉盆地通常可分为采空区中部台阶裂缝密集区域、边界两侧拉裂缝过渡区域和外侧连续变形区域,沿工作面推进方向,台阶裂缝边界滞后工作面约28m,而拉裂缝边界超前工作面5.7~18.4m。地表移动活跃期内变形剧烈且持续时间较短,下沉量占总下沉量的89% ~94%。可采用分区概率积分方法预计浅埋深特厚煤层开采地表移动与变形,方法具有较好的适用性。

关键词: 浅埋深 , 特厚煤层 , 综放开采 , 开采沉陷 , 地表移动变形

Abstract:

Aiming at the problems of complex deformation and failure of surface in fully mechanized top coal caving mining of shallow buried extra-thick coal seam, and lack of measured research on surface subsidence law in Xialiyuan Mining area, the research methods that combined field measurements and theoretical analysis were used in 40201 working face, then the surface movement destruction forms and regional spatio-temporal characteristics were analyzed, and the surface subsidence rule under was summarized, moreover the prediction method of surface movement and deformation in shallow buried extra-thick coal seam mining was optimized. The results showed that the surface movement deformation was severe in the mining of shallow-buried extra-thick coal seam, and the surface subsidence basin was formed rapidly. And the subsidence basin could be divided into the dense area of step cracks in the middle of goaf, the tensile fracture area on both sides of the boundary, and the outer continuous deformation area, and along the advancing direction of the working face, the step fracture boundary would lag behind the working face by about 28m, while the pull fracture boundary would precede the working face by 5.7~18.4m. And the deformation was severe, the duration was short in the active period of surface movement, and the subsidence accounted for 89%~94% of the total subsidence. The zonal probability integral method could be used to predict the surface movement and deformation of shallow buried extra-thick coal seam, and this method had good applicability.

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