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Abstract Based on the briquette specimens of the outburst coal #7 seam of typical coal and gas outburst mine-Datong-One mine of Songzao coal and electricity Co.，Ltd.，the experiment for studying the mechanical properties of the gas-outburst coal under different external stresses pressure are carried out by a self-developed triaxial permeameter and Daojing AG–250 rock mechanics servo-controlled testing machine in the paper. The experimental results show that the confining pressure has an enhancement and progress effect on the mechanical properties of outburst coal containing gas under fixed gas pressure，and the triaxial compressive strength，elastic modulus and peak strain are all monotone and linear increasing with the increasing of confining pressure. The gas pressure has a weak effect on the mechanical properties of outburst coal containing gas under fixed confining pressure，the triaxial compressive strength and elastic modulus are respectively linear and logarithm function monotone decreasing with the increasing of gas pressure，but the peak strain is monotone and linear increasing with the increasing of gas pressure. The effective-stress has an enhancement and progress effect on the mechanical properties of outburst coal containing gas，the triaxial compressive strength，elastic modulus and peak strain are all monotone and linear increasing the with the increasing of effective-stress. The experimental results are of significance in gas extraction and the prediction and estimation of coal and gas outburst with the influence of coal mining.
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Received: 26 December 2008
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