火区下近距离煤层安全开采合理错距研究

Study on Rational Staggered Distance of Closed Depth Coal Seam Mining Safety with Influence of Upper Fire Zones

火区在煤层采动影响下可能通过裂隙影响下煤层安全开采,下煤层工作面应布置在上煤层采动减应力区。因此理论分析及UEDC数值计算研究下方煤层内错、外错10m条件下垂直应力、塑性区分布及垂直位移变化情况,从而确定工作面开切眼及停采线合理位置。研究结果表明,内错10m布置下煤层工作面,可显著降低下煤层围岩应力,有利于回采巷道维护及工作面安全高效开采。

Fire zones may have some effects on lower coal seam mining safety though the mining cranny. With thc use of theoretical a- nalysis and UEDC numerical simulation, we research the vertical stress, plastic zone distribution and the vertical displacement variabil- ity of the lower mining face with the conditions of lay out working face inside or outside I0 meters, and then decide the reasonable posi- tion of open -off cut and stopping cut. The result show that layout mining face inside 10 meters would bring down surroundings rock stress markedness, and in favour of gateways＇maintainance and working face mining safety and efficiency.