Environment-friendly mining design method for mine mining, screening, pressure relief , drainage and filling

Abstract

The invention discloses an environment-friendly mining design method for mine mining, screening, pressure relief, drainage and filling. The environment-friendly mining design method includes the stepsthat firstly, a protective layer on total rock is mined to increase an interlayer crack between the protective layer and a protected layer, and gas pressure relief of the protected layer is realized;meanwhile, high gangue content raw coal produced by mining of the protective layer is transported to an underground coal gangue washing system, and washed gangue is stored in a gangue silo; a gas drainage system is then arranged in the protective layer and the protected layer, and safe and efficient co-mining of a coal seam with low permeability and high gas is realized; and finally, the gangue stored in the gangue silo is transported to the ultra-long mixed mining working face of the protective layer to fill a goaf. According to the environment-friendly mining design method, the difficult problem of gas prevention of the coal seam with the low permeability and the high gas is effectively solved, environment pollution and damage caused by gangue ground discharging are avoided, the miningrate of mine resources and the recovery rate of coal-bearing associated resources are improved, the application range of a protective layer mining technology and a solid filling coal mining method isbroadened, and important technical reference can be provided for mining mines with the same conditions.

Description

technical field [0001] The invention relates to a green mining design method for mining, selection, unloading, pumping and charging, which is especially suitable for a large amount of gangue output in a tunneling working face or a high gangue content rate in a coal mining face, and at the same time, high-gas and low-permeability coal seams need pressure relief and drainage for gas extraction. The mine belongs to the technical field of coal mining. Background technique [0002] With the increasing scale of coal production in my country, the level of mine mining continues to expand, and the proportion of high-gas and low-permeability coal seams is gradually expanding. More than 95% of the coal seams mined by high-gas mines in my country belong to low-permeability coal seams, and the gas permeability coefficient is only 10. -3 ~10 -4 mD, that is, 0.04 ~ 0.004m 2 / (MPa 2 d), air permeability coefficients are all less than 0.1m 2 / (MPa 2 d) Most of the coal seams in mines ar...

AI Technical Summary

Problems solved by technology

At present, the common method of mining high-gas and low-permeability coal seams is to mine the protective layer first for gas pressure relief and drainage, and then to mine the protected layer. The limitations of this method are: First, the layers of the protective layer and the protected layer are required to be relatively reasonable The second is that most of the protective layers are coal seams or thin gangue coal seams. If the distance between the actual high-gas and low-permeability coal seam and the upper and lower coal seams is relatively large, or the distance is reasonable, but the protective layer is thick gangue or the whole rock layer, it does not meet the requirements in the traditional sense. Protective layer mining conditions, the problem that needs to be solved in high gas and low permeability coal seam mining at this time is how to design or select protective layer

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