Filling and reinforcing method for floor roadway cross-layer pressure-relief borehole

Abstract

The invention discloses a filling and reinforcing method of a floor roadway cross-layer pressure-relief bore hole, and is particularly adaptable to filling and reinforcing the cross-layer pressure-relief bore hole for pre-drainage of coal roadway strip gas in loose high-outburst coal seams. The method includes injecting a gas drainage pipe, a slurry injection pipe and a gas discharge pipe into the pressure-relief bore hole, and draining gas after slurring injecting and hole sealing; when gas draining flow is reduced to 0.5m3 / d, pressurizing and filling material slurry into the pressure-relief bore hole, and allowing the slurry to fill the pressure-relief bore hole and penetrate to surround coal through fracture networks. By the aid of the filling and reinforcing method, a reinforcing area can be formed in the coal, support and protect conditions of the coal roadway are improved, coal gas accidents are controlled effectively, speed of tunneling the coal roadway is increased greatly; the magnitude of two-side deformation of the coal roadway can be reduced to 40-60%, gas flowing-out amount is reduced to 30%, and the speed of tunneling the coal roadway is increased to 50%, and the filling and reinforcing method has excellent market promoting value.

Description

technical field [0001] The invention relates to a method for filling and reinforcing a layer-crossing pressure-relief drilling hole in a floor rock roadway, and is especially suitable for filling and strengthening the layer-crossing pressure-relieving drilling hole of a pre-extraction coal roadway strip gas in a soft high outburst coal seam. Background technique [0002] A single soft and high outburst coal seam has the characteristics of low strength, low permeability, high gas pressure, and high ground stress. Gas drainage is difficult, and various gas disasters are easily induced during the mining process. At present, when the protective layer cannot be mined, domestic coal mining enterprises often use hydraulic punching, hydraulic slotting and other pressure relief and permeability enhancement measures to improve the pre-extraction effect of coal seam gas in the coal roadway strips, thereby eliminating the outstanding danger in the coal roadway excavation area. However, ...

AI Technical Summary

Problems solved by technology

However, the interbedded pressure relief drilling formed after a large amount of coal is discharged further reduces the strength of the coal, resulting in uneven distribution of internal stress in the coal seam. Frequent occurrence of dynamic phenomena and difficulties in coal roadway support seriously restrict the safe and efficient mining of a single soft and high outburst coal seam

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