厚煤层放顶煤开采放煤高度的模拟分析

Simulation Research on Coal Drawing Height in Thick Coal Seam Caving Mining

厚煤层进行放顶煤开采是主要的开采方式,在开采过程中,存在放煤高度的最大值及最小值。采用离散元分析的形式对不同放煤高度的应力变化及回收率变化分析,结果表明,在放煤高度最大为6 m时,工作面的最大应力集中系数及剧烈影响范围最大,且此时的回收率最高。

Top coal caving mining in thick coal seams is the main mining method.During the mining process,there are maximum and minimum values of coal caving height.Discrete element analysis was used to analyze the stress change and recovery change of different coal drawing heights.When the maximum coal drawing height was 6 m,the maximum stress concentration coefficient and severe impact range of the working face were the largest,and the recovery rate was the highest at this time.