倾斜厚煤层沿空掘巷窄煤柱合理宽度数值模拟研究

Numerical simulation study on reasonable width of narrow coal pillars along gob road in inclined thick coal seam

为了确定倾斜厚煤层沿空掘巷窄煤柱合理宽度,以兖矿新疆矿业硫磺沟煤矿为研究对象,分析了倾斜煤层条件下沿空掘巷围岩应力分布及变形特征,不同煤柱宽度的垂直应力分布规律。结果表明:煤柱宽度大于4 m时,煤柱内稳定区域增势比较明显,随着煤柱宽度的不断增大,煤柱内稳定核心承载区域不断增大;根据巷道掘进期间垂直应力大小,应力分布规律及围岩巷道稳定性分析确定煤柱合理宽度为4 m;现场实测数据表明,窄煤柱宽度为4 m时可以有效满足巷道围岩稳定性要求。

In order to determine the reasonable width of the narrow coal pillar gob-side entry in the inclined thick coal seam,the stress distribution and deformation characteristics of the surrounding rock of the gob-side entry in the inclined coal seam are analyzed.The vertical stress distribution law of different width of coal pillar is analyzed.The results show that when the coal pillar width is more than 4 m,the stability of the stable area in the coal pillar is obvious.With the continuous increase of the coal pillar width,the stable core bearing area in the coal pillar increases continuously;according to the vertical stress during the roadway excavation,the stress distribution law and the stability analysis of the surrounding rock roadway determins that the reasonable width of the coal pillar is 4 m;the field measured data show that the width of the narrow coal pillar gob-side entry can effectively meet the stability requirements of the surrounding rock of the roadway.