Sharp inclined coal seam paste filling mining technology

Abstract

The invention discloses a sharp inclined coal seam paste filling mining method. According to the method disclosed by the invention, medium-thickness coal seam having the coal bed pitch of 40-90 degrees can be safely and effectively mined. The method can achieve effects of effectively preventing surface subsidence, protecting groundwater resources and surface environment from being damaged and realizing green mining. According to the method, the coal seam roof and floor can be effectively controlled, equipment on the coal face is less, the management is simple, non-pillar mining can be realized, the recovery ratio is high, the stope face is in a two-wing arrangement manner for alternate mining in the mining process, namely when the left-wing stope face is filled, right-wing stope face is recovered. According to the mining method, the mining efficiency can be improved, and the mine production can be increased.

Description

technical field [0001] The invention relates to the technical field of mining of mineral resources, in particular to a coal mining technology of steeply inclined coal seam paste filling. Background technique [0002] The mining method of steeply inclined thick coal seams has always been a difficult problem in the field of mining technology, and has attracted the attention of relevant state departments. Most of the steeply inclined coal seams in our country are distributed in small and medium-sized mines. The geological conditions of the coal seams are complex, and mining is difficult. Some coal mines have many faults, low reserves, high gas content, and poor storage conditions. Due to the particularity of steeply inclined coal seams, there are many problems in mining, mainly because the coal loss rate is high, as high as 40%-50%, and the coal coal coalition rate is often not up to the standard; the roadway excavation rate is high, and the level of the excavation rate affects...

AI Technical Summary

Problems solved by technology

[0006] (3) The deformation and failure characteristics of the two sides and the top and bottom slabs of the gob-side entry retention are different: the upper side and the bottom slab of the roadway are easy to slide, and the gangue falling from the goaf is also easy to be pushed down and strung into the roadway

The method is simple, easy to implement, and effective, but the Wangerville coal mining method is only suitable for near-horizontal coal seams, and there are certain limitations in mining

[0008] However, in the practical application of the long-arm comprehensive mechanized coal mining technology for steeply inclined coal seams, there are ground subsidence, coal mining face support sliding, difficult control of coal seam roof and floor, easy to cause collapse of coal seam roof collapse, floor slippage, and coal wall fragmentation. Helping and other phenomena, the management of the work surface is more difficult

At present, the long-arm comprehensive mechanized coal mining technology for steeply inclined coal seams in China is suitable for deployment in coal seams with an inclination angle of less than 55°, and there are still technical problems and limitations that have not been solved for coal seams with inclination angles above 55°

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