Time - Space - Strength Coordinative Mining Technology of High Gassy Seams Group

In order to realize continues and coordinative mining of low permeability and high gassy seam group, the numerical analysis ,site measurement and other comprehensive means were applied to study the coordinative mining technology of coal mining face in high gassy seam group. The study results showed that there was low stress pressure released zone existed in the floor of the goaf behind the coal mining face and with the coal refuse caving and backfill compaction in the goaf,a stress rising phenomenon occurred again and could not be favor- able to the gas drainage and pressure releasing in the underlying seam. A mining and driving space of the overlying seam was located within a mining stress shell influence scope of the below seam and the poor stability of the surrounding rock with serious failure would not be fa- vorable to the mining and driving operation in the overlying seam. Based on the stress shell existed and the influences from the evolution, a time - space - strength coordinative mining technology of the coal mining face in the high gassy seam group was provided and applied to the No. 6211( 1) Coal Mining Face and No. 62 108 Coal Mining Face in No. 62 Mining Block of Xinzhuangzi Mine. The resultls showed that during the mining process , there was no interaction mining influence between the two coal mining faces and continues and coordinative min- ing of the coal mining face in the seam group was realized.