Skipochka, S. I. та Krukovskyi, O. P. та Krukovska, V. V. та Palamarchuk, T. A. (2020) FEATURES OF METHANE EMISSION IN COAL MINES AT HIGH SPEED LONGWALL FACE ADVANCE. Topical scientific researches into resource-saving technologies of mineral mining and processing. с. 208-225.

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Title in English

FEATURES OF METHANE EMISSION IN COAL MINES AT HIGH SPEED LONGWALL FACE ADVANCE

English abstract

The increase in coal mining is constrained by the gas factor. At high speed of wall advance, the current standards for the forecast of methane emission give significant errors. The goal of work is to study features of methane emission in coal mines at high speed longwall face advance. The proposed method takes into account the geomechanics of the filtration re-gion formation in the calculation of methane inflow. The method consists in sequen-tial calculation of geomechanical parameters, rock permeability coefficients and methane filtration parameters. Established that the step of landing the main roof increases linearly with increasing speed of longwall advance. The blocks size in-creases and the fracturing rocks decreases. The size of the filtration area is reduced near the working stope. The front boundary of the filtration area moves closer to the longwall face. Remote sources of gas emission go beyond the filtration area. The residual pres-sure of methane increases in undermined gas-bearing rocks and coal. The process of destruction and the emission of electrons decreases. This leads to a slowdown in methane desorption processes. Thus, an increase in the speed of wall advance allows to reduce specific gas emission in the production sites. However, the requirements for the powered roof and drift supports are increasing due to the increase and redistribution of stresses in the rocks. This should be taken into account when choosing the optimal operating conditions for the mining section of a coal mine.

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