Full-mechanized coal mining coal-pillar-free sublevel filling coal mining method for steeply inclined coal seam strike

Abstract

The invention discloses a full-mechanized coal mining coal-pillar-free sublevel filling coal mining method for steeply inclined coal seam strike. According to the principle, the method includes the steps that after a steeply inclined coal seam field is divided into mining areas, a long-wall fully mechanized coal mining face is arranged along the coal seam strike, and after advancing in the coal mining face, a goaf is subjected to sublevel filling along the coal seam strike. According to the rock mechanics principle and the lithology of overlying rock of the coal mining face, the dimensions D and strength of sublevel filling bodies and the limited span L of sublevel filling are determined under the condition that the upper roof of the overlying rock is not broken. A filling-body filling area is divided into inclined sealing filling areas by sublevel small coal pillars and rectangular air bags, and paste filling is conducted in the sealing areas through pipelines. By means of the method, the filling amount can be reduced, the filling cost is lowered, the resource recovery rate is increased, and the safe, environmental-friendly and economical coal mining effects are achieved.

Description

technical field [0001] The invention relates to the field of mining techniques and methods, in particular to a fully mechanized coal mining method with no coal pillars and section filling in the direction of steeply inclined coal seams. Background technique [0002] Steeply inclined coal seams refer to coal seams with an inclination angle greater than 45°. The safe and efficient mechanized mining of such coal seams is a worldwide problem. The reserves of my country's steeply inclined coal seam account for about 17% of the total coal reserves, and its annual output only accounts for 3.8% of the national total coal output. According to statistics, among the more than 600 state-owned key coal mines and local coal mines in my country, more than 100 mines mine steeply inclined coal seams, accounting for 16.5%. [0003] In recent years, with the increase of mine mining intensity, high-quality coal resources have been rapidly depleted. In order to ensure the sustainable developmen...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of low resource recovery rate due to the need to retain ore pillars in the traditional steeply inclined coal mining method, and the need for a large amount of filling materials in the goaf full filling method in the prior art, and the problems of high filling and transportation costs , to provide a simple, safe, green, economical and practical coal mining method for fully mechanized mining in steeply inclined coal seams with segmental filling

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