Lightweight quick setting top-caving area filling material

Abstract

The invention discloses a lightweight quick setting top-caving area filling material. The lightweight quick setting top-caving area filling material is mixed by primary materials B and primary materials B, wherein the primary materials consist of sulfate aluminum cement, coal ash, a water reducer, a setting accelerator, a foaming agent and a dispersing agent; the primary materials B consist of gypsum, lime, a water reducer, a setting accelerator, a dispersing agent and a foaming agent. The lightweight quick setting top-caving area filling material has the lightweight quick setting characteristic; after entering and filling into a top-caving area, the foamed slurry can quickly lose mobility and is solidified within 5 minutes to form a lightweight filling body, wherein the density of the filling body is about 1.4t / m<3>, the 2h uniaxial compressive strength can reach 4 MPa, certain compression performances are provided, the performances of the filling body are stable, the cracking deformation is avoided, and the filling needs of the top-caving area can be met very well.

Description

technical field [0001] The invention relates to a light quick-setting high-risk filling material, which is mainly used for filling the high-risk area of ​​a mine to prevent secondary caving in the high-risk area, and can effectively fill the high-risk area to prevent gas accumulation. Thoroughly solve the hazards caused by the high risk area to the mine. 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 wind...

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; the third is that there is uncertainty in the stability of the high-risk area, and secondary roof-fall may occur under certain conditions

[0004] The filling materials currently used are generally polymer materials, which are expensive and can be burned, and there are still potential safety hazards after treatment of high-risk areas

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