Method for filling mined coal to recover residual coal pillar and controlling stability of waterproof key layer
A coal mining technology with coal pillars and filling, which is applied in the direction of filling, ground mining, mining equipment, etc., can solve the problems of aggravating the ecological fragile environment, soil erosion, damage, etc., and achieve the effect of ensuring long-term stability
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[0048] A western mine originally adopted the short-wall strip room mining method, resulting in a large number of coal pillars left underground, resulting in a large waste of coal resources. In recent years, it has been found that some coal pillars are unstable and spontaneously combustible, which in turn leads to large-scale subsidence on the surface, seriously affecting the local ecological environment. In order to solve the above-mentioned problems, in combination with the content of the invention of this patent, the specific implementation methods for the recovery of the remaining coal pillars in the first mining face are as follows:
[0049] (1) Aiming at the mined area of the first mining working face in a panel area, along the direction perpendicular to the main road, arrange a mining working face for every two adjacent columns of coal pillars, the mining height of the working face is 4.5m, and the working face is 800m in length , the inclination length is 70m, and a s...
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