Coal mine bulk stock cut and fill mining method

Abstract

The invention relates to a coal mine bulk stock cut and fill mining method, and the mining and cutting and filling process is as follows: (1) circularly mining web on a working plane; (2) starting a cut-fill and transportation machine, and transporting the filler to the cut-fill working plane; (3) sequentially filling a first charging hole to a fifth hole on the tail part of a scraper conveyor to be compacted, repeatedly filling and compacting the filler inside each charging hole for 2 to 3 times, compacting the filler to the roof, and completing the filling of a first step; (4) pulling the filling scraper conveyor for one step, repeating the filing and compacting step, adequately filling the filler to the roof and adequately compacting the filler, and completing the filling of a first turn; (5) pushing a mining machine to the working plane, setting the coal mining step of 0.5 to 0.8m, and carrying out the mining; and (6) adjusting the cut-fill machine after second web, and carrying out the filling of a second turn. A coal mining system and a filling system are integrated through a filling hydraulic support, the mining of the work plane is synchronously carried out with the filling operation, and the integration of the mining and the filling operation is realized.

Description

technical field [0001] The invention belongs to the technical field of goaf filling in mines, and relates to a method for filling goafs in coal mines, in particular to a method for filling and mining coal mine bulk materials. Background technique [0002] The mining of compressed coal under buildings, water bodies and railways has always been a major problem that plagues my country's coal mining enterprises. With the gradual depletion of resources in some mining areas, the problem of three-down coal pressing has become more prominent. Especially in economically developed areas, due to the shortage of land resources and the increase in requisition costs, it is imperative to press coal without relocation of mining buildings. The successful mining of coal under the three pressures is of great significance to improving the utilization rate of coal resources and alleviating the tension of mine resources. [0003] The traditional methods to solve the problem of three-down coal p...

AI Technical Summary

Problems solved by technology

Although the method of leaving protective coal pillars can solve the problem of surface subsidence, it cannot recover the coal pressed under the building, resulting in a large amount of coal loss

The disadvantages of strip mining are low recovery rate (less than 50%), serious waste of resources, high roadway excavation rate, and low production efficiency, which restrict the high-yield and efficient development of coal mines

Layer-separated grouting filling, the subsidence reduction effect is better only in the case of incomplete mining, but the disadvantage is that it cannot achieve the ideal subsidence reduction rate in the mining of adjacent multiple working faces, that is, the subsidence reduction effect of grouting filling in the mining of the first working face Better, the settlement reduction rate is limited when the second adjacent working face is mined, and even the difficulty of grouting leads to failure

While filling in gobs solves the problem of coal pressing under some mine buildings, it also shows limitations and deficiencies. For example, the initial investment of the filling system is large, the filling body is poor in connection with the roof, the price of filling materials is high, and the interference between filling and coal mining is large. Low coal mining efficiency

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