Construction process of gob side roadway protection in medium-thickness coal seam coal face

Abstract

The invention relates to the technical field of coal mining, and provides a construction process of gob side roadway protection in a medium-thickness coal seam coal face. The construction process comprises the steps that a single hydraulic prop is supported in a reserved roadway to be matched with an I-shaped beam, and an anchor cable is erected to be matched with a channel steel protection roof;a presplitting blasting hole is formed in the roof; a single hydraulic prop is supported at the fork of the reserved roadway and the coal face to be matched with the I-shaped beam; the I-shaped beam is erected in the lagging part of the coal face, a steel bar mesh and a metal mesh are sequentially paved along the roadway trend, then the single hydraulic prop is supported to be matched with the I-shaped beam, and then a diagonal prop is supported to strengthen the support of the I-shaped beam; outside the lagging area of the coal face, the single hydraulic prop is retracted; the roadway is treated with shotcrete in full section; and a grouting pipe is pre-embedded under the roof of the coal face for grouting. According to the construction process, the technical effects that the resource recovery rate can be increased, the production cost is saved, the impact on the dynamic pressure of the adjacent roadway is reduced, the secondary maintenance amount of the roadway is decreased, and thelabor intensity of employees is lowered are achieved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a construction technology for gob-side roadway protection in coal mining working faces of medium-thick coal seams. Background technique [0002] In the past, some mines in China have researched and realized small coal pillars or even no coal pillars mining, but there are many roadways with high stress in the surrounding rock, large deformation of the roadway, high maintenance cost when the roadway is in use, and the small coal pillars left are completely crushed and deformed. 1. If the filling method realizes no coal pillars, the filling body will bulge and deform, and even need to re-expand the coal side, and the maintenance cost of the roadway will even exceed that of a newly dug roadway. Due to the uncontrollable direction of the blasting method, the pressure relief may even cause damage to the roadway. The research and test show that the roof cutting and press...

AI Technical Summary

Problems solved by technology

[0002] In the past, some mines in China have researched and realized small coal pillars or even no coal pillars mining, but there are many roadways with high stress in the surrounding rock, large deformation of the roadway, high maintenance cost when the roadway is in use, and the small coal pillars left are completely crushed and deformed. 1. If the filling method realizes no coal pillars, the filling body will bulge and deform, and even need to re-expand the coal side, and the maintenance cost of the roadway will even exceed that of a newly dug roadway. Due to the uncontrollable direction of the blasting method, the pressure relief may even cause damage to the roadway. Research and tests have shown that the above problems can be solved by using directional concentrated energy blasting for roof cutting and pressure relief.

Images