极近距离煤层同采工作面合理错距研究

Reasonable Offset Distance of Simultaneous Mining Faces with Ultra Close Distance Coal Seams

为确定极近距离煤层同采工作面的合理错距,分析讨论减压区开采、稳压区开采两种不同布置方式,计算得出9#煤层开采对底板的破坏深度为9.11m。分析上部煤层开采对下部煤层围岩稳定性的影响,确定该矿采用稳压区开采布置方式。采用理论技术和数值模拟方法综合研究表明,同采工作面合理错距应不小于35m。

In order to determine the reasonable offset distance for mining the two ultra close distance coal seams simultaneously,this paper analyzes two different arrangements of mining in decompression zone and steady pressure zone.It is calculated that the failure depth of the No.9 coal seam mining to the floor is 9.11 meters.On the analysis of the influence of the upper coal seam mining on the surrounding rock stability of the lower coal seam,it is determined that the pressure distribution zone mining arrangement should be used.Theoretical analysis and numerical simulation show that the reasonable offset distance between the two simultaneous mining faces should be no less than 35 m.