METHOD FOR PREDICTING METHANE ABUNDANCE FOR EXCAVATION SITES Russian patent published in 2024 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: invention relates to a method for predicting the absolute methane abundance of an excavation site. The method includes determining the parameters of the occurrence of a suite of coal seams in the conditions of a gas rock mass. It also includes determining the zone of rock collapse of the roof of the mined coal seam and the zone of fracturing of the rock mass in the roof and soil of the working seam and the rate of advance of the longwall. Additionally, indicators of the physical-mechanical and gas-dynamic state of rocks in the area of the mining relieving action are determined. Fracture zones in the roof rocks and soil of the mined seam are determined by the lithological composition of the host coal seam rocks and the distance between the coal seams. Taking into account the rate of advance of the longwall, the location of zones of increased intensity of methane release from adjacent coal seams into the workings of the excavation site and mined-out space is established. The extent of zones subject to unloading in the roof and soil of the working seam and the degree of their natural degassing are also determined by the total intensity of methane emission from the mined and adjacent coal seams located in the area of the excavation site. The value of the absolute methane abundance of the site, the permissible load on the working face in terms of the gas factor and the hazard category of the mine in terms of methane are also determined.

EFFECT: increasing the accuracy of forecasting the absolute methane abundance of a coal rock mass during the development of a coal seam by a longwall face.

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