Coal mine underground drilling filling reinforcement material

Abstract

The utility model relates to an underground coal mine drilling filling reinforcement material, which belongs to the drilling filling reinforcement material. Coal mine underground drilling filling reinforcement materials: water 30-40%, ordinary Portland cement 20-40%, rock powder 25%-45%, bentonite 3-8%, high-efficiency air-entraining water-reducing agent 1.2-1.6%, three Sodium polyphosphate 0.2-0.4%, iron powder 0.4-0.6%; the above-mentioned substances can be mixed according to mass percentage; the rock powder is taken from underground coal mines, and the particle size is not greater than 4mm. The rock powder in the filling reinforcement material of the present invention comes from underground coal mines, and the material is convenient; the material has good fluidity before the initial setting, and can well fill the cracks and holes in the borehole; the material has high compressive strength after solidification, high viscosity It has the characteristics of strong bond and good durability, which can meet the requirements of drilling filling and reinforcement. By filling the boreholes that have completed gas drainage, especially the boreholes that adopt pressure relief and permeability enhancement measures such as hydraulic punching and hydraulic slotting, the strength of the coal body around the borehole is improved, and the coal roadway is reduced. Support difficulty.

Description

technical field [0001] The invention relates to a drilling filling reinforcement material, in particular to a coal mine underground drilling filling reinforcement material. Background technique [0002] When the outburst coal seam does not meet the mining conditions of the protective layer, outburst prevention measures must be taken to pre-extract coal seam gas. At present, most of my country's outburst coal seams have the characteristics of "three highs and one low" of high stress, high gas pressure, high gas content and low permeability. Pressure relief and permeability enhancement measures such as hydraulic cutting to improve the effect of gas pre-pumping in outburst coal seams have become the key to eliminating gas disasters for coal mining enterprises. However, such measures achieve pressure relief and permeability enhancement through the discharge of a large amount of coal, which reduces the strength of the coal around the drill hole, resulting in uneven stress distrib...

AI Technical Summary

Problems solved by technology

At present, most of my country's outburst coal seams have the characteristics of "three highs and one low" of high stress, high gas pressure, high gas content and low permeability. Pressure relief and permeability enhancement measures such as hydraulic slotting to improve the effect of gas pre-pumping in outburst coal seams have become the key to eliminating gas disasters for coal mining enterprises

However, such measures achieve pressure relief and permeability enhancement through the discharge of a large amount of coal, which reduces the strength of the coal around the drill hole, resulting in uneven stress distribution inside the coal seam, resulting in jacking, pinching, ringing coal guns, and coal wall spalling during the mining process. The frequent occurrence of isodynamic phenomena and the difficulties in coal roadway support have seriously restricted the popularization and use of hydraulic punching, hydraulic slotting and other pressure relief and anti-reflection measures.

Reinforcement of the coal body around the borehole can eliminate the above-mentioned adverse effects. The borehole that adopts pressure relief and antireflection measures such as hydraulic punching and hydraulic slotting has a large amount of material usage, which has great impact on material injectability, compression resistance, stability, etc. The characteristics of high requirements, but so far, there are few reports on this kind of drilling filling reinforcement materials at home and abroad.

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