坚硬顶板条件下厚煤层沿空留巷最优巷高参数研究

Study on Optimal Roadway Height Parameter of Gob-side Entry Retaining in Thick Coal Seam Under Hard Roof Condition

采用理论分析和数值模拟的方法研究了沙曲矿坚硬顶板条件下厚煤层沿空留巷最优巷高问题。通过理论分析,分析了坚硬顶板条件下厚煤层沿空留巷顶板断裂运动规律;运用数值模拟方法,确定合理采高(留巷高度)为4.5 m。结果表明:采高为4.5 m时,沙曲矿沿空留巷体系整体变形量较小,巷道变形稳定后具有较高的有效使用断面,巷道围岩承载结构更加稳定,留巷体系的稳定性得到有效的提升。说明坚硬顶板条件下厚煤层沿空留巷存在着最优的留巷高度。

The optimal roadway height of gob-side entry retaining in thick coal seam is studied by theoretical analysis and numerical simulation under the condition of hard roof in Shaqu Coal Mine.Through theoretical analysis,the roof fracture motion law of gob-side entry retaining in thick coal seam under the condition of hard roof is analyzed.The reasonable mining height(roadway height)was determined to be 4.5 m by numerical simulation.The results show that,when the mining height is 4.5 m,the overall deformation of gob-side entry retaining system is small,the roadway deformation is stable and has a higher effective section,the surrounding rock bearing structure of the roadway is more stable,and the stability of the roadway retaining system is effectively improved.It is proved that there is an optimal roadway height of gob-side entry retaining in thick coal seam under the condition of hard roof.