Steeply-inclined coal seam working face and coal mining method

Abstract

The invention discloses a working face of a steeply-inclined coal seam. Inclining direction of the working face is in falsely-inclined straight line arrangement while advancing direction of the same is strike of the coal seam, and concentration is linear concentration in straight line arrangement from an air way to a machine way along the inclining direction of the working face; a support comprises multiple rows of basic point columns arranged parallel to the inclining direction of the working face and multiple groups of metal hinging top beams supported by a plurality of the basic point columns, length direction of each metal hinging top beam is strike of the working face, and the metal hinging top beams are arranged parallelly. The concentration is linear, so that distance in the strike direction of the working face is shortened, and unsupported roof span is shortened. In addition, the support comprises the metal hinging top beams and the basic point columns which replace capped point columns, so that supporting area is increased, a roof is effectively controlled, probability of roof collapse accidents is reduced, and mining cost is lowered. The invention further discloses a steeply-inclined coal seam mining method applied to the working face.

Description

Technical field [0001] The invention relates to the technical field of coal seam mining, in particular to a steeply inclined coal seam mining face. It also relates to a coal mining method applied to the mining face of the steeply inclined coal seam. Background technique [0002] Steeply inclined coal seams refer to coal seams with an inclination angle greater than 45°. Due to the large inclination angle of the coal seam, mining is more difficult. At present, the common mining methods for steeply inclined coal seams mainly include strike longwall mining method, inverted step mining method, storage coal mining method, protruding sloping section dense coal mining method and flexible shield mining method. [0003] Among them, the coal mining face of the downward pseudo-incline segmented intensive mining method is arranged along the downward pseudo-incline straight line direction, and the inclination angle of the working face is smaller than the true inclination angle of the coal seam ...

AI Technical Summary

Problems solved by technology

However, for the thin coal seam with soft roof, the effect of subsection intensive coal mining with dipping and pseudo-inclination is not very good. Capped point columns cannot control the roof of the working face, and the pillars at the cutting top line are easy to be pushed down. The safety threat to the column return process is great, and the roof fall accident is difficult to control

And because the arrangement direction of horizontal dense pillars is along the direction of the working face, it is necessary to increase the number of rows of basic point pillars. If the basic point pillars are arranged along the working face, a large number of basic point pillars will be occupied and the mining cost will be increased. , and the segmented density increases the control distance, the roof pressure increases, the roof is exposed for a long time, and it is easier to break, making it difficult to return to the column and extremely inconvenient for workers to operate.

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