Waste coal mine filler based on slag

Abstract

The invention relates to the technical field of coal mine fillers. The invention specifically discloses a waste coal mine filler based on slag. The waste coal mine filler comprises, by mass, 30%-40% of the slag, 20%-40% of cement, 10%-20% of sand, 5%-10% of fly ash, 10%-15% of lime, 0.5-1.5 kg/m < 3 > of hybrid fibers and 3.5%-15% of an inorganic additive. The hybrid fibers are two or more of steel fibers, glass fibers, carbon fibers or basalt fibers, and the lengths of different fibers are different. The waste coal mine filler has high corrosion resistance and strength, can bear high stress generated by surrounding rock deformation, is high in fire resistance, and can meet the grouting requirements of underground coal mine roadways.

Description

technical field [0001] The invention relates to the technical field of coal mine filling materials, in particular to a waste coal mine filling material based on slag. Background technique [0002] Coal resource mining is an important guarantee for national energy security. At present, many mines in my country have entered the later stage of coal pillar recovery, and with the mining of coal pillars in the roadway, the underground pressure is serious, which brings serious safety problems. The research shows that the rheological characteristics of the surrounding rock will appear under the condition of high stress, and there will be unequal deformation in the whole process, and the floor heaving is the most common problem in the deformation of the surrounding rock. At the same time, under the action of high stress, the possibility of rock bursts in the deep underground during coal mining increases, and it causes uneven deformation of the roadway. During the continuous excavatio...

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Problems solved by technology

[0005] The invention provides a waste coal mine filling material based on slag to solve the problem that the existing filling materials have poor anti-corrosion performance, and the strength cannot

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