Mining area self-reserved roadway non-pillar mining method suitable for gently inclined coal seam

Abstract

The invention discloses a mining area self-reserved roadway non-pillar mining method suitable for a gently inclined coal seam. The method comprises the following steps of determining the exploitationrange for gob-side entry retaining without coal pillars in a coal mine, forming openings at main roadways, tunneling two mining area roadways and an air return roadway of a first-mining working face,and widening a crosscut to connect with a main air return roadway; connecting the three roadways and the crosscut, so as to form a preparation roadway and an air ventilation system of the mining area, which is the main feature of the method. The method is characterized in that the open-off cut is performed on a first working face, and various production systems are arranged; the stoping is performed on the first working face, and a gob-side entry retaining technique is used for remaining the roadway with a certain width as a transportation roadway of a second working face; the stoping is performed on the second working face, and the roadway with a certain width is remained as an air return roadway of a third working face; the steps are repeated for the subsequent working faces. The methodis used for realizing the stoping without roadway tunneling and coal pillars in the mining area.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] At present, the mining methods of coal mines in my country, regardless of the gently inclined coal seam or the inclined coal seam, generally adopt the mining area-oriented longwall mining method, that is, several stages are divided within the scope of the mine field, and one or two main roads are arranged along the direction of the coal seam at the bottom of the stage. The upper part is arranged along the direction of the coal seam with a large air return roadway, which is divided into several mining areas along the direction of the coal seam within the scope of the stage. The mining area is divided into several sections along the inclination of the coal seam, and the coal mining face is arranged along the inclination of the coal seam in the section. 2 to 3 uphill roadways are arranged along the coal seam inclination in the mining area and connected to the upper an...

AI Technical Summary

Problems solved by technology

Each section usually needs to dig two mining roadways before mining. In order to ensure the normal connection of the mining face, it is necessary to excavate the mining roadway of the next working face before the mining of the previous working face is completed. Protective coal pillars need to be left between the working faces, which not only causes waste of coal resources, but also causes stress concentration of coal pillars and potential coal spontaneous combustion hazards. At the same time, it may also cause tension in mining replacement. Remaining roadway to implement mining without coal pillars

However, this mining system of gob-side entry is still not complete, and each section still needs to excavate a section transportation level entry to form a new coal mining face with another roadway left along the gob, and the coal mining face will be relocated. Long distance, long moving time, high work intensity

In addition, the traditional mining area layout with 2 to 3 mining areas uphill is generally arranged in the middle of the mining area or on the same side boundary of the mining area, which is not conducive to forming an easy-to-move coal mining face that can smoothly switch between forward and backward

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