Z type horizontal stratification top coal caving coal mining method in half-edge thick coal seam

Abstract

The invention relates to an underground coal mining method, in particular to a Z type horizontal stratification top coal caving coal mining method in a half-edge thick coal seam. The method comprises the following steps: arranging an alley way, comprising tunneling a roof alley along the roof of the coal seam, setting wind and water pipelines and liquid inlet and outlet high pressure pipes in the roof alley, arranging a communication system, and paving a scraper conveyor; using the roof alley as a wind inlet alley, a transport alley and a safety exit; reserving a bottom board alley along the coal seam at the back of a mining working face so that two safety exits are formed on the mining working face; using the bottom board alley as a wind return alley and a safety exist so that the wind inlet alley is separated from the wind return alley; mining, comprising moving the tail of a scraper conveyer in the roof alley; moving the scraper conveyer on the working face; detaching a trapezoid support in the roof alley; carrying out coal breakage; moving the support; and carrying out gob-side entry retaining. According to the method, the arrangement of the alley is improved, the production system is optimized, and full exhaust ventilation of the working face is realized.

Description

technical field [0001] The invention relates to an underground coal mining method, in particular to a Z-shaped horizontal layered top-coal caving mining method for steeply inclined thick coal seams. Background technique [0002] A steeply inclined coal seam refers to a coal seam whose inclination angle is greater than 45° during underground mining. The structure of steeply inclined coal seams is complex, with many faults and folds, and the thickness of the coal seams varies greatly. Therefore, most of the mines mining steeply inclined coal seams are medium and small mines. The inclination angle of the steeply inclined coal seam is greater than the angle of repose of the rock, and the coal mined in the coal mining face can slide down automatically, thus simplifying the loading and unloading work of the working face, but the falling coal and gangue are easy to overturn the support and injure personnel, and the steeply inclined coal seam and The joints of the surrounding rock...

AI Technical Summary

Problems solved by technology

The inclination angle of the steeply inclined coal seam is greater than the angle of repose of the rock, and the coal mined in the coal mining face can slide down automatically, thus simplifying the loading and unloading work of the working face, but the falling coal and gangue are easy to overturn the support and injure personnel, and the steeply inclined coal seam and The joints of the surrounding rock are developed, and the initial pressure and periodic pressure are not obvious, and it is prone to sudden large-scale roof collapse without warning, causing roof accidents and bringing some unsafe factors to production.

Therefore, there are many unsafe factors in production and poor safety

The component force of the steeply inclined coal seam roof pressure acting vertically on the support or coal pillar is smaller than that of the gently inclined coal seam, and the component force acting along the inclination is larger. After the coal seam is mined, the coal seam roof and floor may slide and collapse along the inclined direction. Poor stability, prone to twisting and tipping

Therefore, it is very difficult to support the working face