Method for realizing spontaneous combustion three-zone division and fire prevention and extinguishing by using large-diameter drill hole

The invention discloses a method for realizing spontaneous combustion three-zone division and fire prevention and extinguishment by using a large-diameter drill hole, which comprises the following steps of: constructing the large-diameter drill hole near a roadway, penetrating through a coal seam and extending to a goaf, arranging a wall protection steel pipe in the large-diameter drill hole, and arranging a hollow orifice reserved air taking hole in the wall protection steel pipe; along with the forward pushing of the large-diameter drill hole, a gas taking rod extends into different depth positions of the goaf through reserved gas taking holes in the hole opening to extract gas; gas is detected to determine oxygen concentrations of different depth positions, a first critical position and a second critical position of the goaf are determined based on the oxygen concentrations, and the oxygen concentrations of the two positions conform to a first oxygen critical point and a second oxygen ...