Gas Control Technology for Gassy Close Coal Seam Group Mining Face Under Complex Geological Conditions

For the mining characteristics of high gas, low permeability at close distance coal seam group under complex geological conditions in Baliancheng Mine, we proposed comprehensive control scheme of using vertical crossing drilling hole and roof high level borehole to extract gas, and formed gas control system for high gas, low permeability coal seam group mining under complex geological condition, which effectively solve the problem of gas overrun under complex geological condition.