Long wall alternate type coal mining method

Abstract

The invention discloses a long wall alternate type coal mining method which comprises the following steps: the reasonable mining band width of the long wall alternate type coal mining method and the coal pillar size retained among mining bands are determined, and the working face adopts a single hydraulic prop and a metal articulated top beam; the working face adopts alternate mining, i.e. a coalpillar is retained when a mining band is mined, and the coal pillar is retained or 2 to 3 mining bands form a mining section; a temporary coal pillar is retained among the mining bands; a rigid isolation coal pillar is retained among the mining sections; and the long wall alternate type coal mining method is a mining method for arranging the working face on the long wall and propelling in an alternate way to prevent through thickness integral cutting and falling of covering rock. The method has the effect of improving the mining rate of an original house pillar type mining method to 60-70 percent from 20-30 percent; the working face propelling distance of the method is more than twice of a tool post type method, and the moving frequency of the working face is reduced to less than half; themining rate of a mining area is improved, and a top plate large-area collapsing catastrophe is prevented by top plate small-area disaster-free falling by the liming and isolating effect of the coal pillar on the covering rock.

Description

technical field [0001] The invention relates to a coal mining method, in particular to a long-wall interval coal mining method. Background technique [0002] A coal mine is located in the border area of ​​the local mining area of ​​the Jurassic coalfield, and the designed production capacity after reconstruction and expansion in 1999 is 0.75Mt / a. There are four recoverable coal seams in the mine field, which are 2 from top to bottom. -2 、3 -1 、3 -1 Lower and 5 -1 coal seam, currently mined 2 -2 Coal seam, the first mining face is 20105. [0003] 2 -2 The coal seam belongs to the thick loose layer on the surface and the shallow buried coal seam. The terrain and landform characteristics along the 20105 working face belong to the loess hilly and gully area, with steep slopes and deep gullies, complex topography, and the thickness of the covering layer is 35m-115m. and bedrock. [0004] Since the end of the 1980s, with the successive production of large mines in a certai...

AI Technical Summary

Problems solved by technology

[0008] The working face of this knife pillar coal mining method only advances 23m before stopping mining and leaving the coal pillars for relocation. This is safe, but for coal mining enterprises, this mining method has frequent relocation, large coal pillars, and waste of coal resources. High cost, time-consuming and labor-intensive, and inability to obtain higher economic benefits and other defects

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