Steeply inclined thick coal seam horizontal subsection small short-wall fully mechanized caving mining method

Abstract

The invention discloses a steeply inclined thick coal seam horizontal subsection small short-wall fully mechanized caving mining method. The method comprises the following steps of 1, arranging a working face roadway, specifically, dividing a coal seam into a plurality of horizontal subsections along the inclination direction, arranging the working face stoping roadway, forming ventilation systemson the two sides of the stoping roadway, forming a coal conveying system on an air inlet side and forming a gob-side air return roadway in a gob; and 2, performing stopping, specifically, adopting acoal roadway fully-mechanized excavating machine for coal falling, arranging two traction supports in the advancing direction of a working face, arranging two coal caving supports perpendicular to thetraction supports, punching deep holes in the working face stoping roadway before coal caving to conduct presplitting on top coal, after presplitting, firstly pulling and moving the two traction supports, forwards pulling and moving two coal caving supports at the same time, enabling the second coal caving support to achieve coal discharging by 1/3 after the first coal caving support is used forachieving coal discharging by 1/3, repeatedly executing the steps alternately, stopping coal caving when gangue accounts for a half of the coal caving amount. The method has the advantages of being reasonable in design, easy and convenient to construct, high in coal recovery rate and safe in 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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