INFLUENCE OF STRESS VARIATION IN ROOF ROCKS OF COAL SEAM ON STRATA GAS CONDITIONS IN LONGWALL ADVANCING
V. A. Trofimov, Yu. A. Filippov
Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, 111020 Russia
Keywords: Угольный пласт, напряженно-деформированное состояние, фильтрация, проницаемость, разгрузка, пригрузка, метод комплексных потенциалов, Coal seam, stress-strain behavior, permeation, permeability, relaxation, additional load, complex-potential method
Abstract
Mining of a horizontal isolated seam in a uniform medium in plane strain conditions is considered. The stress distribution in roof rocks of the coal seam is obtained at different stages of mined-out area development. The stresses are governed by the complex-variable function, which allows determining location and configuration of zones of stress relaxation and additional load in rock mass. This information is required for estimation of induced jointing and formation of gas pockets in the coal seam parting. The use of the analytical solution makes it possible to obtain relations for finding stress concentration factors and to present the related parameters as contour lines.
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