Step-type non-coal pillar mining method in steeply inclined medium-thick coal seam

Abstract

The present invention discloses a steep medium-thickness coal seam stepped coal pillar-free coal mining method. A tunnel is pre-tunneled and a step working face and a corresponding tray bracket are arranged in the tunnel. Extractive integration support is performed through a flexible shield support. An upper tunnel in front of the step working face is used as an air return tunnel, and a rear tunnel is used as a haulageway. In tunneling process, the flexible shield support and the tray bracket of the upper tunnel in front of the step working face bridge the haulageway behind the step working face and simultaneously work as a tunnel support system of a next step working face for recycling. The coal mining method helps to solve the problems that the inclination of steep medium-thickness coal seam is large, the arrangement of the working face as a conventional mining method is difficult and complex, overcome the difficulties of mechanization coal mining for steep medium-thickness coal seam, eliminate tunnels in every working face, reduce the tunneling, improve working face arrangement speed and working face succeeding relations, simplify ventilation and transportation systems, and reduce tunnel support costs.

Description

technical field [0001] The invention relates to a coal mining method, in particular to a steeply inclined medium-thick coal seam step and no coal pillar coal mining method using a support-shaped support. Background technique [0002] Although there are many formal coal mining methods with steep slopes in the country at present, all of them have applicable conditions. Frequently used steep-inclined coal mining methods include pseudo-inclined flexible cover support mining method, horizontal layered top-coal caving mining method, comprehensive mechanized coal mining in steeply inclined thin coal seams, and full-height mining method. However, for coal seams with a thickness of 5-10m and a steeply inclined coal seam with an inclination angle of more than 70°, the above coal mining methods are not suitable, and the layout of the coal mining face is quite difficult. [0003] For the steeply inclined coal seams with a thickness of less than 3m and an inclination angle of less than ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a step-type non-pillar coal mining method for steeply inclined medium-thick coal seams. This coal mining method solves the difficult and complicated problem of working face layout according to traditional coal mining methods with large inclination angles of steeply inclined medium-thick coal seams. It solves the difficulty of mechanized coal mining in steeply inclined medium-thick coal seams, and at the same time does not need to excavate section roadways in each working face, reduces the amount of roadway excavation, increases the speed of working face layout and improves the succession relationship of working faces; simplifies ventilation and transportation system, reducing roadway support costs

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