Study on Rational Staggered Distance at Combined Mining Face of Close Distance Coal Seams

In order to ensure the safety of combined mining under the condition of close distance coal seam group mining face, through the theoretical analysis, numerical simulation method and combined with field monitoring data, we study the conventional staggered distance of the coal seam working face mining, and give the calculation formula in theory. Research shows that the combined mining of close distance coal seam group, the stress distribution under the condition of different staggered distance is obvious difference; the conventional staggered distance of 45 to 50 m is determined.