Method for realizing gob-side entry retaining through grouting anchor cable

Abstract

The invention discloses a method for realizing gob-side entry retaining through a grouting anchor cable. The method includes the steps of designing a tunnel needing to be reserved for use, isolating a goaf, and keeping the tunnel complete to serve as a transportation, ventilation and pedestrian tunnel of a next working face; constructing an anchor cable hole according to design, installing and anchoring the anchor cable and sealing the hole; reinforcing a top plate through early grouting during pushing-gathering so that the tunnel and the top plate can be glued into a whole, arranging the anchor cable along the boundary of the goaf, erecting nogs, point pillars and gangue bags along the boundary for blocking after pushing-gathering of the tunnel so that boundary overlocking and topping of the goaf can be achieved, and pressing the top plate through the goaf till the top plate breaks and naturally collapses because no support exists above the goaf so that the tunnel can be reserved. The top plate is secondarily reinforced through grouping by reasonably using the grouping anchor cable, the reinforcing effect is remarkable, the surrounding rock of the top plate is stable, the overall mechanical performance is remarkable, the horizontal stress of two banks is reduced, the overall deformation of the tunnel is reduced by about 70%, the support cost is reduced, the tunnel is not secondarily repaired, and later-period workloads are reduced.

Description

technical field [0001] The invention relates to coal mining, in particular to the gob-side entry retaining technology. Background technique [0002] Traditional coal mining is usually arranged with two alleys on one side, and a certain width of coal pillars is reserved between the upper and lower working faces. The remaining coal pillars cause waste of resources, and the mining is relatively high. Therefore, in recent years, the coal-pillarless mining method of gob-side entry has been adopted, and the double-side entry is changed to a single-side entry mining mode, and the gob-side entry is used as the transportation, ventilation and pedestrian roadway of the next working face. Most of the current gob-side entry retention adopts masonry gangue walls and paste filling methods to replace the reserved coal pillars, or uses impact-resistant constant resistance anchor cables on the roof of gob-side entry retention for pressure support. Because building a thick wall requires a lo...

AI Technical Summary

Problems solved by technology

Because building a thick wall requires a lot of gangue and paste materials, and when the roof is broken, the constant resistance anchor cable is prone to failure, and the anchor cable only plays the role of suspension and cannot achieve the effect of cementing the roof. Empty entry generally requires secondary support and reinforcement support, and the support cost is very high

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