Abstract
ABSTRACT Combined with underground engineering practice of gas disaster control, the permeability evolution of coal under mechanical characteristics of three mining layouts is studied. According to the abutment pressure distribution of three mining layouts (protective coal seam, top-coal caving and non-pillar mining), the seepage experiment of gas-containing coal under stress paths of three mining layouts is implemented with a self-developed triaxial seepage device. The results show that the permeability variation of coal under three mining layouts is different, the relationship is revealed between the stress state and the permeability changes of coal. The research results will provide some basic theories for the technology of coal and gas simultaneous extraction as well as gas disaster control in the exploiting area of underground coal mines.
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