Filling material for high caving area of coal roadway

Abstract

The invention belongs to the technical field of the filling of high caving areas of coal roadways, and particularly relates to a filling material for a high caving area of a coal roadway. The filling material consists of the following raw materials in part by mass: 25 to 30 parts of expanded perlite, 30 to 40 parts of cement, 8 to 15 parts of ceramsite, 35 to 45 parts of water, 0.2 to 8 parts of water reducing agent, 1.5 to 3.5 parts of expanding agent, 1.5 to 3.5 parts of accelerating agent and 0.2 to 0.9 part of redispersible latex powder. The invention has the advantages that the filling material does not generate heat, is not combusted when filled, has the characteristic of high-temperature resistance and a good closed effect, so that the phenomenon of filler combustion due to the spontaneous combustion of coal seams of the high caving areas in thick coal seams; and the filling material is light, so the weight of the filler after the filling material is filled can be reduced, and the filler is difficult to drop and high in compression strength.

Description

technical field [0001] The invention belongs to the technical field of filling high-risk areas of coal mine roadways, and in particular relates to a filling material for high-risk areas of coal roadways. Background technique [0002] In the process of coal mining, in thick coal seam coal roadways or areas affected by structures, the roof stability of the roadway is poor, and the roof is easy to fall, forming a high risk area in the roadway. The long-term existence of the high risk area will bring safety hazards to coal mine production. [0003] The unfavorable aspects of the existence of the high risk area in the roadway are mainly manifested in the following aspects: one is that the high risk area occurs in the coal seam that is prone to spontaneous combustion, and the coal seam at the top of the high risk area is in a windless area and is easy to oxidize, causing spontaneous combustion; the other is that the top of the high risk area It is easy to cause gas accumulation an...

AI Technical Summary

Problems solved by technology

[0002] In the process of coal mining, in the thick coal seam coal roadway or the area affected by the structure, the roof of the roadway is not stable, and the roof is easy to fall, forming a high risk area in the roadway. The long-term existence of the high risk area will bring safety hazards to coal mine production

[0003] The unfavorable aspects of the existence of the high risk area in the roadway are mainly manifested in the following aspects: one is that the high risk area occurs in the coal seam that is prone to spontaneous combustion, and the coal seam at the top of the high risk area is in a windless area and is easy to oxidize, causing spontaneous combustion; the other is that the top of the high risk area It is easy to cause gas accumulation and gas over-limit phenomenon; thirdly, there is uncertainty in the stability of high-risk areas, and there will be roof-fall phenomena

[0004] For a long time, coal mining enterprises have been paying attention to and timely deal with high-risk areas. There are mainly two methods for dealing with high-risk areas: one is artificial wood pile filling, and filling with fly ash, loess or other materials. This filling method is efficient Low, the filling process is dangerous, and the filling and sealing effect is not good; the second is to inject organic materials, such as foamed resin, Ma Lisan, FCC chemical materials, Polein materials, Rockshine materials and Ruimi materials, etc., although organic materials The filling efficiency of the material is high, but the filling cost is high, especially the chemical reaction of the filling material during the filling process, which releases a large amount of heat, which is easy to cause the combustion of the coal seam. There have been cases of spontaneous combustion of organic materials in the high-risk area, which caused serious damage to the mine. The big loss also leaves hidden dangers for future safe production