Study on Space Activity Law of Overburden Strata Above Longwall Coal Mining Face in High Inclined Seam

According to the deformation,failure and complicated migration law of the overburden strata above the longwall mining face in a high inclined seam affected to the safety mining of the coal mining face,the sitemeasurement,numerical simulation and similar material simulation were applied to study and summarize the deformation,failure and migration law of the immediate roof,main roof and high level strata space above the longwall coal mining face in the high inclined seam.The results showed that during the mechanized strike longwall coal process in the high inclined seam,asymmetric mechanics features occurred between the low level rock and high level rock of the roof above the coal mining face along the inclined direction and the failure migration would be a time sequence and unbalance.Along the inclined direction of the coal mining face,the three zones features in the top area were obvious and the level was high.And in the low area and the roof strata,there were no obvious three zones features or the level to form three zones was low and not completed.During the multi section and multi seam mining,the influence degree of the up strata would be higher than single seam and would have certain mine pressure bumping.