Method for preventing and controlling gas on low-permeability outburst coal seams

The invention discloses a method for preventing and controlling gas on low-permeability outburst coal seams. The method includes: arranging uniformly-distributed drill holes on a mining face of a coal seam, and choosing spaced holes as coal seam gas drainage drill holes; and placing mining static expanding agent into each drill hole to stretch the expansion hole walls to generate fractures around each expansion hole wall to form a coal seam gas diffusion and permeation channel so as to improve low-permeability coal seam gas drainage parameters and coal seam drainable level. By adjusting content of oxides of aluminum, iron and magnesium, calcium oxide in the mining static expanding agent and additive, the mining static expanding agent has sufficient expansion force to crack the coal seam in a pressure centralizing area of the mining face; by injecting quantitative expanding agent into expansion holes, under the action of expanding and stretching of the expanding agent, the hole walls are cracked to greatly cra