Coal and gas outburst is one of the most serious hazards in underground mine operations. In this paper, we explored the damage and gas seepage characteristics of gas-bearing coal samples with different pore structures under methane sorption-sudden unloading conditions using a self-developed experimental apparatus. The results show that (1) the deformation of coal samples can be divided into three stages, namely, pressure-increase-induced compression, sorption-induced expansion, and sudden-unloading-induced deformation or failure stage; (2) with the increase of the number of diffusion pores in the coal sample, the amount of gas sorption gradually increases and the expansion and failure of coal samples become more obvious; (3) in the experiment, the damage of coal samples is mainly along the axial direction and rarely along the radial direction; (4) the radial strain is always greater than the axial strain.
Abstract. Analyzing the main factors effecting prevention of coal and gas outburst of multi crosscuts united coal uncovering for highly outburst seam of deep, the thesis proposes comprehensive outburst prevention measures based on regional governance measures and supplemented by local governance measures to realize seam outburst elimination in essence. According to the site engineering geological characteristics, closed loop floor roadways were formed and regional measures using widely layer-through boreholes for gas extraction were successfully implemented, this technology becomes success model for rock cross-cut coal uncovering on similar conditions and provides an effective method for realization of regional predrainage outburst measure for rock cross-cut coal uncovering.
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