Method for extracting rim angle coal and re-extracting after warehouse coal extracting

Abstract

The invention relates to a method for re-mining after the coal mining in a barn and the stoping of irregular coal. The method of the invention includes the arrangement of roadways and the technologies of mining, coal blasting, coal loading, coal transporting, supporting and dual-wing recovery and is characterized in that as for the arrangement of the roadways, a plurality of sections are divided in a panel and two preparation roadways are arranged in the sections, with one preparation roadway serving as an air intake way and the other one as an air return way; after the coal mining is finished in the previous section, the air intake way of the previous section can be taken as the air return way of the next section; only one air return way needs excavating in the next section; a long strip-shaped room pillar is arranged between the two preparation roadways, which ensures that the stopping of the next room pillar can be carried out under the less pressure of a top plate; as for the technology of mining, room mining is first carried out in the strip-shaped room pillar by adopting anchor net support; the coal at two wings are recovered by bidirectional retreating after the air return way is communicated, which causes small and medium-sized coal mines with 'resource depletion' to realize the re-mining and large and medium-sized coal mines to achieve the stopping of coal pillars and the irregular coal, thus improving recovery ratio and conserving resources.

Description

technical field [0001] The invention belongs to underground coal mining technology, in particular to a method for re-mining after coal mining in a traditional warehouse and a method for recovering corner coal. Background technique [0002] At present, the recovery rate of warehouse coal mining in my country is extremely low, only about 30%, especially in the coal fields that were mined by the warehouse coal mining method before the 1990s, the resource recovery rate is even lower. If these mine fields are not re-mined, it will cause a huge waste of coal resources in our country; especially in some mining areas, the lower group of coal has been mined without re-mining, and the upper group of coal will disappear. Due to backward coal mining methods, not only a large amount of valuable coal resources in small and medium-sized mines cannot be recovered, but also there is no advanced mining method for coal pillars and corner coal in large and medium-sized mines. The resulting was...

AI Technical Summary

Problems solved by technology

[0005] 1. Low recovery rate: the waste of resources is serious, and the recovery rate of coal mining in warehouses is only about 30%;

[0006] 2. Low safety factor: due to the fact that the coal mining, drilling, blasting and other processes in the warehouse are all operated under the empty roof and the degree of mechanization of coal loading and transportation is low, there are many people employed, so accidents occur frequently;

[0007] 3. Low output: The degree of mechanization of the warehouse and the short-walled working face is low, and most processes are completed manually, so the unit yield of the working face is low;

[0008] 4. Too many people and low work efficiency: Most of the processes in warehouses and short-walled working surfaces are done manually, so many people are employed and work efficiency is low;

[0009] 5. Poor economic benefits: The destructive exploitation of a large amount of resources and the investment of a large amount of manpower in mining ultimately result in poor overall economic benefits

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