论文部分内容阅读
采用传统方法对4#煤层需要留设的防水煤岩柱尺寸进行计算,分析结果认为传统方法对于倾斜煤层防水煤柱中央弹性核区存在重复计算的问题,因此造成留设的防水煤柱尺寸偏大。为了改善传统方法存在的弊端,在保证安全的前提下对4#煤层屈服区尺寸进行计算并考虑覆岩移动角度的影响,得到设计方法优化后的防水煤岩柱尺寸。为了进一步提高采区回采率,综合分析煤柱留设的共性问题,提出巷道布置的优化方案。研究结果表明,设计优化后留设防水煤柱的尺寸仅为原方法的42.42%,综合起坡段带来的三角煤损结合防水煤岩柱尺寸,优化后的煤炭损失仅为原方法煤炭损失的45.42%,按照采区设计的推进长度计算,相邻工作面之间可多采出煤炭资源近1.58 Mt。另外,优化方案中起坡段回采工艺可以改善工作面倾角大带来的设备稳定性的问题。
The traditional method is used to calculate the size of waterproof coal pillar which need to be left in 4 # coal seam. The analysis results show that the traditional method has the problem of repeated calculation for the central elastic core of waterproof coal pillar in inclined coal seam, Big. In order to improve the shortcomings of the traditional method, under the premise of ensuring safety, the size of yielding zone in No.4 coal seam was calculated and the influence of overburden movement angle was considered, and the size of waterproof coal pillar after optimization was obtained. In order to further improve the recovery rate of the mining area, a comprehensive analysis of the common problems of coal pillar set-up and the optimization plan of the roadway layout are put forward. The results show that the size of the water-proof pillars left after design optimization is only 42.42% of the original method, and the triangular coal loss combined with the size of the waterproof coal and rock pillars combined with the kick-off section, the coal loss after optimization is only the coal loss of the original method Of the 45.42% of the coal mining area. According to the designed length of the mining area, an additional 1.58 Mt of coal resources can be exploited between adjacent working surfaces. In addition, the lifting scheme in the optimized scheme can improve the stability of the equipment brought by the dip of the working face.