Sealing grouting material and its preparation method and application

Abstract

The invention discloses a hole sealing injecting paste material, as well as a preparation method and application thereof. The material comprises the following materials in parts by weight: 60 to 65 parts of cement, 45 to 50 parts of alpha-CaSO4<.>0.5H2O4, 20 to 25 parts of quicklime, 3 to 5 parts of aluminum potassium sulfate dodecahydrate, 3 to 5 parts of sodium bicarbonate, 0.3 to 0.5 part of citric acid, 0.2 to 0.4 part of sodium dodecyl sulfate, and 0.1 to 0.15 part of aluminum powder. The hole sealing injecting paste material is suitable for pressurized grouting hole sealing process for a gas extraction drill hole, can keep good stability under a 1.2 to 1 high water-cement ratio condition, has the advantages of rapid hardening, high early strength, groutability and solidified body strength, and the like, and can conduct ideal sealing on a crack at the periphery of a drill hole due to a double-stage distension function, so as to completely cut off air inleakage paths. All the raw materials are commercial conventional materials, and are nontoxic, harmless, and low in price; field application tests show that compared with like products, the hole sealing injecting paste material has a better application effect.

Description

technical field [0001] The invention relates to a grouting material for hole sealing, in particular to a hole sealing grouting material and a preparation method and application thereof. Background technique [0002] Gas drainage in this coal seam is an important means of controlling gas disasters, and the sealing quality of the drainage borehole significantly affects the drainage efficiency. The sealing material is the core element of the sealing process, and it plays a decisive role in the sealing quality of the drilled hole. Therefore, improving the performance of the sealing material is an important way to improve the sealing process. [0003] The pressure grouting sealing process is a sealing method developed in recent years, such as organic foam material-cement sealing, bag-type sealing, inflatable (water injection) capsule-cement sealing and pressure injection polyurethane sealing . The characteristic of this type of process is that a closed annular grouting space is...

AI Technical Summary

Problems solved by technology

[0004] However, the current pressurized grouting process mostly uses ordinary cement grout. After the grouting is completed, a part of the grout will inevitably leak through the cracks around the drilled hole, and will shrink when it solidifies. For large-inclination drilled holes, it will not Fatal impact, but for gently inclined or near-horizontal drilling, crescent-shaped cracks will be formed in the upper part of the grouting section, forming air leakage channels, resulting in failure of sealing

If organic materials such as polyurethane are used for grouting under pressure, there are many disadvantages such as high viscosity of mixed grout, difficulty in grouting, fast response time, high construction requirements, low compressive strength, unable to resist the impact of mining ground pressure, high material price and toxicity, etc.

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