Gob-side entry driving small coal pillar anti-impact pressure-releasing and counter-pulled anchoring integrated structure and construction method thereof

Abstract

The invention discloses a gob-side entry driving small coal pillar anti-impact pressure-releasing and counter-pulled anchoring integrated structure and a construction method thereof. An upper row of counter-pulled anchor cables and a lower row of counter-pulled anchor cables are adopted at gob-side entry driving small coal pillars for reinforced supporting, drill holes of the upper row of counter-pulled anchor cables adopt anti-impact pressure-releasing large-diameter drill holes, the two ends of each large-diameter drill hole are filled with concrete to be closed, and the middle of each large-diameter drill hole is hollow. The large-diameter drill holes are constructed in the coal pillars, and the counter-pulled anchor cables are mounted on the coal pillars, the functions of anti-impact pressure releasing and anchor cable mounting are integrated, the dual effects of coal pillar anti-impact pressure releasing and coal pillar bidirectional reinforcing through the counter-pulled anchor cables are achieved, the stability of the coal pillars is improved, deformation of entry sides is reduced, the counter-pulled anchor cables can be prevented from being broken under pulling and then flying off through the mode that the two ends of each drill hole are closed through the concrete, and poisonous and harmful gas and gob accumulated water are prevented from entering a gob-side entry driving roadway. The gob-side entry driving small coal pillar anti-impact pressure-releasing and counter-pulled anchoring integrated structure and the construction method thereof are suitable for anti-impact pressure releasing and reinforcing of the coal pillars of coal mines.

Description

technical field [0001] The invention belongs to the technical field of gob-side digging in coal mines, and in particular relates to an anti-scouring, pressure-relief, pull-and-anchor integrated structure and a construction method for small coal pillars in gob-side digging. Background technique [0002] Coal pillar-free mining can rationally develop coal resources, improve coal recovery rate, and reduce roadway excavation. Pillarless mining mainly includes two methods: gob-side entry without pillar mining and gob-side entry retaining without pillar mining. Gob-side driving is to excavate the roadway along the edge of the goaf after the impact of mining caused by the mining of the previous working face is stabilized. In practical application, the width of the coal pillars between the tunneling roadway and the roadway of the previous working face ranges from 3 to 8m, and the reserved coal pillars are in the stress reduction area, but in some places with large buried depth, str...

AI Technical Summary

Problems solved by technology

In practical application, the width of the coal pillars between the tunneling roadway and the roadway of the previous working face ranges from 3 to 8m, and the reserved coal pillars are in the stress reduction area, but in some places with large buried depth, strong mine pressure, and In a mine with a risk of impact, when excavating gob-side roading, the coal pillar is seriously deformed under pressure, and the displacement of the side of the road is large, and there is still a certain risk of mine pressure impact, which threatens the safe production of the mine.

When anchor cables are used to reinforce small coal pillars in the conventional way, resin anchoring agent is used in the anchor section of the anchor cables. After the small coal pillars are crushed, the anchoring force of the anchor cables is greatly reduced, because the reinforcement effect is poor and the roadway deformation is large

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