Handling method and device for double-medium stacked supporting and hard top plate type mined-out area

Abstract

The invention discloses handling method and device for a double-medium stacked supporting and hard top plate type mined-out area, and aims at solving the construction problem that the hard top plate of a thick coal mine seam is difficultly fallen. The method is that a base stack body fills in the mined-out area after the mining at the working face; the base stack body and the top plate are subjected to flexible roof contact by filling chemical materials; the spacing and arrangement distance of the filled stacks are influenced by the mining depth, height and lithology of the top plate and other factors, wherein the arrangement distance is 15 to 30m, and the spacing is 8 to 15m; the section of the filled stack can be circular, rectangular or quadrate; the effective section area is 0.8 to 1m<2>; the flexible roof contact medium is 1/10 to 1/8 of the mining height; the base stack can be filled by grouting concrete or gravels and other materials. The method and device are particularly suitable for continuous mining of shallow buried thin coal seam layers; the design that the working surface is frequently moved while supporting the mined-out area through tool posts is replaced, or the complex processes of softening the top plate by filling water and blasting and pre-cracking are decreased.

Description

technical field [0001] The invention relates to a coal mine goaf treatment method and device with a double-medium stack supporting a hard roof, and is especially suitable for the continuous mining field of shallow buried thin coal seams. Background technique [0002] The rock strata of the coal seam roof in Datong mining area are hard in nature, with a firmness coefficient greater than 8, and a compressive strength of 80-180Mpa in general. In the process of mining the coal seam, due to the hard roof, it cannot fall in time after the goaf, and a large area of ​​suspended roof is often formed. When the gob area reaches a certain range, and the roof and coal pillars approach or exceed the limit load, it will cause a large area of ​​the roof. The sudden collapse causes severe dynamic phenomena, which not only damages the supporting equipment, but also squeezes the air in the goaf to be discharged instantaneously, forming a huge shock wave and causing serious damage. [0003] Th...

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Problems solved by technology

However, this technology increases the construction process, reduces the efficiency of mining, and increases the cost of mining.

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