Coal and gas outburst in steep inclined coal seam uncovered by two reverse drifts and technology of outburst elimination by increasing permeability with blasting
ZHANG Chun-hua
LIU Ze-gong
XU Tao
LIU Jian
CAI Feng
Abstract：Coal and gas outburst dynamical disaster in steep inclined coal seam uncovered by two reverse drifts was simulated by RFPA~(2D) -Flow software developed on the basis of the solid-gas coupling dynamic model, in which the heterogeneity characteristics of the mechanical properties of coal and rock and the nonlinear evolution characteristics of gas permeability in stressed coal and rock were considered and incorporated. The stress evolution, the cranny development and the gas flowing rule during the outburst were analyzed from a microscopic view. The numerical simulation and the outburst case indicate that the high gas pressure and gas gradient, the serious stress concentration and superposition, the noticeable weight stress of the kneaded coal body as well as the instantaneous blast stress impact are integrated reasons for the outburst. Introduced the outburst elimination experiment of deep hole pre-splitting controlled blasting technology, the result indicates that the permeability increasing radius of the blasting hole is longer than 3 m and the technology has good effect on preventing outburst disaster in high gas and low permeability coal seam uncovered by crosscut as well as achieving opening out the coal seam safely and fast.
Keywords：crosscutreverse driftsteep inclined coal seamcoal and gas outburstoutburst elimination
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 85-88 )