Method and device for weakening strong rock pressure of thick and hard roof in mining of underlying coal seam by microwave heating

Abstract

The invention discloses a method and a device for weakening underlying coal seam mining thick-hard roof strong mine pressure through microwave heating. A row of holes are drilled from a bottom plate on a coal mining work face of an overlying coal seam to an underlying coal seam thick-hard roof, wherein the distance d between each two adjacent holes is 6-18m, the drilled holes are perpendicularly arranged in the advancing direction of the coal mining work face of the overlying coal seam, and when the overlying coal seam is mined, the strong mine pressure of the underlying coal seam mining thick-hard roof is weakened. The method and the device for weakening the underlying coal seam mining thick-hard roof strong mine pressure through the microwave heating fully utilize the characteristics ofbeing high in efficiency, large in energy density, wide in adaptability, strong in penetrability and the like of microwave heating rock breaking, perform presplitting on the underlying coal seam thick-hard roof when the overlying coal seam is mined, and achieve the purpose of weakening the underlying coal seam mining thick-hard roof strong mine pressure, thereby achieving green mining and safe production for coal mines.

Description

technical field [0001] The invention relates to a method and a device for microwave heating to weaken the strong mine pressure of an underlying coal seam with a thick and hard roof, belonging to the field of coal mining. Background technique [0002] Most of the coal mines in my country use the downward mining method, that is, the overlying coal seam is mined first and the underlying coal seam is mined, and the underlying coal seam in many mining areas has thick and hard roofs with large thickness, high strength, no joints and fissures, and good integrity. When the working face continues to move forward, the suspended roof area of ​​the thick and hard roof in the stope will gradually increase without collapsing, and the initial / periodic pressing step distance of the thick and hard roof in the stope will also increase, and a large amount of Energy, when the thick and hard roof of the stope suddenly collapses, the accumulated energy will be released instantly, which will cause...

AI Technical Summary

Problems solved by technology

However, the technology of microwave heating to weaken the strong mine pressure is rarely applied in the field of coal mining technology (especially in the field of microwave heating to weaken the strong mine pressure in the mining of thick and hard roofs in the underlying coal seam).

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