Filling and retracement method for coal mine downhole coal mining working surface retracement channel

Abstract

The invention provides a filling and retracement method for a coal mine downhole coal mining working surface retracement channel. According to the method, a main retracement channel body of the double-roadway ladder-shaped retracement channel commonly adopted at the time of retracement of an existing coal mine downhole coal mining working surface is subjected to segmented one-way retreating type filling; it is guaranteed that in the process, tunneling and penetrating of the main retracement channel body, a subsidiary retracement channel body and a connection roadway, filling of the main retracement channel body and normal stoping of the coal mining working surface cannot disturb one another; a cinder coal powder ash high-concentration cemented filling material is selected; and finally, a filling body in the main retracement channel body is cut through a drum coal cutter to form the main retracement channel body again, and the coal mining working surface is subjected to retracement by means of the subsidiary retracement channel body and the connection roadway. The filling body in the main retracement channel body can play a better role in supporting on main retracement channel body surrounding rock, rock stratum moving can be limited, roof separation is reduced, roadway deformation is controlled, and safe, economic and efficient retracement of the coal mine downhole coal mining working surface is facilitated.

Description

technical field [0001] The invention relates to the technical field of underground coal mining operations in coal mines, in particular to a method for filling and retracting a retraction channel of an underground coal mining face in a coal mine. Background technique [0002] At present, the double-lane "ladder-type" retraction channel is generally used for the retraction of the coal mining face in underground coal mines, which greatly shortens the retraction time of the coal mining face, realizes the rapid retraction of the coal mining face, and helps High yield and high efficiency of mine production. However, during the continuous advancing process of the coal mining face, the main retraction channel of the coal mining face, that is, the withdrawal channel on the side close to the coal mining face, will be subject to the advanced bearing pressure caused by mining when it is closer to the coal mining face. The main retracement channel was seriously deformed due to the effec...

AI Technical Summary

Problems solved by technology

However, during the continuous advancing process of the coal mining face, the main retraction channel of the coal mining face, that is, the withdrawal channel on the side close to the coal mining face, will be subject to the advanced bearing pressure caused by mining when it is closer to the coal mining face. The main retracement channel was seriously deformed due to the effect of the main retracement channel, and the top, floor and two sides of the main retracement channel were greatly moved closer. retracement

[0003] In response to the above situation, the current improvement measures are to densely arrange high-strength hydraulic supports in the main retraction channel, but what follows is that the supports are crushed to death, the pillars are crushed, and the roadway deformation is still serious when the supports are scrapped.

As the coal mining face is getting closer to the shutdown line, in order to withdraw the coal mining face normally, it is necessary to deal with the crushed supports, renovate and maintain the main withdrawal channel, which will cost a lot of money, and due to the The withdrawal channel is severely deformed. For safety reasons, few construction teams are willing to renovate the main withdrawal channel, and then face a greater economic cost to find suitable personnel to renovate the main withdrawal channel; sometimes for the sake of simple renovation And timely, it is possible to carry out renovations when the deformation of the main retracement channel is not serious, which means that multiple rounds of renovations will be carried out, thus paying more economic costs

In addition, as the mining depth of the coal mine increases, the ground stress increases, and the above situation will become more serious; if the coal mining face is advanced to the designated position, maintenance or initial excavation of the main withdrawal channel will restrict the safety of the coal mining face. Rapid retracement affects the high yield and high efficiency of mine production

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