Anti-outburst method for coal mine single coal seam protective layer pressure relief and permeability-increasing type sequential layer extraction

The invention belongs to the technical field of coal mine gas extraction, and particularly relates to an anti-outburst method for coal mine single coal seam protective layer pressure relief and permeability-increasing type sequential layer extraction, which comprises the following steps of: firstly, carrying out sequential layer drilling construction at the lower part of the coal wall of a tunneland vertical to the coal wall of the tunnel, forming a linear pressure relief drilling hole at the lower part of the coal wall of the tunnel, wherein the influence regions of the adjacent pressure relief drilling holes are connected with each other to form an arched shed effect pressure relief region; then, carrying out the construction of the gas extraction drilling at the upper part of the coalwall of the tunnel. According to the invention, the technical problem of sequential drilling pre-extraction coal seam gas pressure relief is effectively solved, by arranging linear dense pressure relief drilling holes at the l