A fully mechanized caving mining method with small and short walls horizontally segmented in steeply inclined thick coal seams

Abstract

The invention discloses a method for fully mechanized caving mining of steeply inclined thick coal seams in horizontal sections with small short walls, comprising: 1. Arrangement of working face roadways: dividing the coal seam into several horizontal sections along the inclination, arranging the mining roadways of the working face, A ventilation system is formed on both sides, a coal transportation system is formed on the air inlet side, and a return air tunnel along the gob is formed in the goaf. Brackets and vertical traction supports are arranged with two coal discharge supports. Before coal discharge, deep holes are drilled in the mining roadway of the working face to pre-split the top coal. Support, the first coal discharge support puts 1 / 3 of the coal, and then the second coal discharge support puts 1 / 3 of the coal, and this is repeated alternately. When the gangue accounts for half of the coal discharge, the coal discharge is stopped. The invention has the advantages of reasonable design, simple construction, high coal recovery rate and safe mining process.

Description

technical field [0001] The invention relates to a coal seam mining method, in particular to a horizontal subsection small short wall fully mechanized caving mining method for steeply inclined thick coal seams, which belongs to the technical field of coal mining. Background technique [0002] Steeply inclined coal seams refer to coal seams with an inclination angle greater than 45°, which are abundant in countries such as Russia, Ukraine, Poland, western my country, and coal-deficient areas in the south, especially in Xinjiang, where the reserves are abundant, but mining is extremely difficult. Small coal mines mining such coal seams generally adopt traditional non-mechanized coal mining methods, such as stacking, warehousing, steps, and roadway laying, etc. These methods have low degree of mechanization, high labor intensity, complex processes, poor working environment, and difficult management , many safety accidents and low production efficiency. Since the 1970s, medium-s...

AI Technical Summary

Problems solved by technology

Small coal mines mining such coal seams generally adopt traditional non-mechanized coal mining methods, such as stacking, warehousing, steps, and roadway laying, etc. These methods have low degree of mechanization, high labor intensity, complex processes, poor working environment, and difficult management , many safety accidents, low production efficiency

Since the 1970s, medium-sized coal mines have gradually experimented with wire rope sawing coal mining method, pseudo-inclined flexible cover support coal mining method, segmented intensive coal mining method, inverted step coal mining method, etc. in the mining of steeply inclined coal seams, but these methods still exist. Problems such as high labor intensity and low production efficiency

[0004] When adopting horizontal section fully mechanized caving mining, there are problems such as short working face, high roadway excavation rate and low production efficiency;

[0005] When the longwall caving is adopted with a steep slope, there are problems such as poor support stability, easy toppling and sliding of working face equipment, violent overburden activities in the stope, difficult roof management, complex mining process, low top-coal discharge rate, poor efficiency and safety, etc.

[0006] It can be seen that there is currently no reasonable coal mining method at home and abroad that can safely and efficiently mine steeply inclined thick coal seams with an inclination angle greater than 55° and a thickness of 4m-10m. High New Coal Mining Method

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