Rational Alternate Research on Simultaneous Mining Faces in Lijiahao Close Distance Seams

Combining with actual conditions of Lijiahao Coal Mine, in order to achieve the design capacity of mine production, simultaneous mining was carried out in 2-2 and 3-1 close distance seam group. In order to reduce the mutual superposition influence of two mining faces from abutment pressure, the 3-1 lower coal seam was located in the decompression zone of 2-2 upper coal seam, which ensured safety production of the two coal seams. Using theoretical analysis combined with numerical simulation, rational alternate distance of mining faces is confirmed. And there is a good effect in practice.