Spraying material for coal mine underground roadway and preparation method of spraying material

Abstract

The invention discloses a spraying material for a coal mine underground roadway and a preparation method of the spraying material. The problems that existing spraying materials are poor in cohesiveness, high in rebound and easy to crack, lots of the materials drop on the ground, and functions of seepage prevention, water leakage prevention, gas leakage prevention and the like are not fulfilled aresolved. The spraying material and the preparation method thereof are provided. According to the spraying material for a coal mine, an inorganic composite material is adopted, various advantages of anorganic material and an inorganic material are combined, the optimal proportion of raw material components is analyzed by an orthogonal test method, the spraying speed and the spraying quality are greatly increased, the working environment is improved, meanwhile, the cost is reduced, and good economic benefits and social benefits are obtained.

Description

technical field [0001] The invention relates to a spraying material for coal mine underground roadway and a preparation method thereof, and specifically relates to the technical field of spraying material for coal mine underground roadway construction and the preparation of the material. Background technique [0002] Coal-measure strata in underground coal mine roadways are mostly coal rock, sandstone, shale, mudstone and clay rock. Not only the mechanical properties of the rock are poor, but also the joints and fissures are developed and the stability is not good. Sandstone, sandy shale or argillaceous sandstone of various particle sizes in the surrounding rock of coal mine roadway are easily weathered, softened by water absorption, and even muddied, disintegrated and expanded. The underground space of the coal mine is narrow, the environment is harsh, the coal wall is uneven and wet, water seepage is common, the rock mass is deformed after the roadway is excavated, and gas...

AI Technical Summary

Problems solved by technology

[0004] 1. In the underground mining site, the dry mixing of cement sand and gravel, cement sand and gravel and other dust pollution is large, which is harmful to the workers on site and seriously pollutes the underground environment;

[0005] 2. On-site mixing, the noise generated by the mixer is large, which is harmful to the hearing of the operator;

[0006] 3. On-site mixing, it is not easy for the operator to strictly control the proportion of cement, sand and gravel, etc., and the quality control of the sprayed materials is not strict, which may easily cause hidden dangers of quality accidents; in addition, the poor adhesion of the sprayed materials is easy to produce The floor material causes a lot of waste, and generally rebounds more than 30% of the floor material; the performance of the sprayed material is single, and it is impossible to make the sprayed material have high adhesion, water resistance, crack resistance, reinforcement and support;

[0007] 4. On-site mixing needs to occupy valuable underground roadway places, such as stacking cement, sand and gravel, etc., which will affect the roadway section and transportation gap, affect the construction speed of the main coal mining industry, and easily block the roadway and cause accident hazards;

[0008] 5. The thickness of the spraying is required to be thick, generally 10-20 cm thick, the adhesion is poor when sprayed, the rebound is large, and the ground material is large, resulting in serious waste of spraying materials, and at the same time, the mortar coagulates slowly and the supporting effect is slow;

[0009] 6. After the spraying material is solidified, due to the single ingredients, most of the components are rigid, the material is rigid and brittle, and the flexibility is insufficient. With the geological movement of the underground roadway or the vibration of blasting in the re-mining, it is very easy to cause cracking of the traditional spraying material If it falls off, it may cause further hidden dangers such as water leakage, gas overflow, and support mortar collapse, and cannot really play its due protective role.

[0010] In summary, due to the shortcomings of traditional shotcrete technology such as slow construction speed, poor working environment, large material consumption, large auxiliary transportation volume, and many safety hazards, it greatly restricts the current mine roadway excavation using anchor shotcrete support. Therefore, it is necessary to develop a new type of mining spraying material with excellent performance to improve the support strength, save costs, and optimize the sealing process of roadway support

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