Deep mine close-range ultra-thin protective layer mining arrangement structure and mining method

Abstract

The invention discloses a deep mine close-range ultra-thin protective layer mining arrangement structure and a mining method. The deep mine close-range ultra-thin protective layer mining arrangement structure comprises a protected layer air return way, a protective layer upper air inlet way, a protective layer lower air inlet way, a protective layer air inlet way, a protected layer cutting hole and a protective layer inner cutting hole, wherein the protective layer upper air inlet way and the protective layer lower air inlet way are positioned at the upper part or the lower part of a circulation body formed by communicating the protected layer air return way and the protected layer air inlet way; and the protective layer inner cutting hole is formed in the upper part or the lower part of the protected layer cutting hole. The deep mine close-range ultra-thin protective layer mining arrangement structure has the advantages that through determining a deep mine coal seam group protective layer and a protected layer, the distance between the protective layer and the protected layer and the thickness of the protective layer are optimally designed; and a protective layer mining production system and a drilling and gas pressure monitoring system are determined. A novel method can be provided for technical conditions of mining the deep strong outburst coal seam group without proper coal seams as the protective layer, so that the safe mining of the strong outburst coal seam group is realized.

Description

technical field [0001] The invention relates to the technical field of deep mine protective layer mining, and specifically relates to a deep mine short-distance ultra-thin protective layer mining layout structure and mining method. Background technique [0002] With the increase of mining depth, the phenomena of high ground stress, high gas, low permeability and low strength coal appear in coal mines. The original safety protection technology does not meet the needs of efficient production, and coal and gas accidents have occurred successively. Safety production poses a threat and seriously restricts the safe development of coal mines. On the other hand, affected by the occurrence environment of deep rock masses, the complexity of geological conditions increases, the coal seam gas pressure, gas content, and absolute gas emission in coal seam group mining conditions are larger than those in shallow coal seams, and the gas permeability of coal seams is further reduced. As a r...

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Problems solved by technology

[0002] With the increase of mining depth, the phenomena of high ground stress, high gas, low permeability and low strength coal appear in coal mines. The original safety protection technology does not meet the needs of efficient production, and coal and gas accidents have occurred successively. Safety production poses a threat and seriously restricts the safe development of coal mines

On the other hand, affected by the occurrence environment of deep rock masses, the complexity of geological conditions increases, the coal seam gas pressure, gas content, and absolute gas emission in coal seam group mining conditions are larger than those in shallow coal seams, and the gas permeability of coal seams is further reduced. As a result, coal seams with no risk of outburst or coal seams with less risk of outburst originally mined as protective seams are upgraded to outburst coal seams or strongly outburst coal seams. There are fewer and fewer coal seam protective layers to choose from, and it is difficult to choose the first mining coal seam. Regional gas Governance is extremely difficult, and the traditional mining method of coal seam protection faces great challenges

When there are no technical conditions suitable for coal seams to be exploited as protective seams in strong outburst coal seam groups in 1,000-meter-deep wells, regional gas control will become a technical bottleneck restricting mine production and efficiency

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