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Abstract The coal and gas outburst，which threatens coal mine safety production，is an extremely complex geological phenomenon that occurs in the coal mine production. Briquette body of different particle size serves as the object of study，a series of experiments are designed by using the polarization analysis software and strain control triaxial compression apparatus；and the purpose of the study is to get physico-mechanical properties of briquette body with different particle sizes. Further more，coal and gas outburst simulation experiment device is utilized to simulate coal and gas outburst process under the same above-mentioned conditions for the sake of the influence law of different particle diameters on coal and gas outburst. The results of experiment demonstrate that coal particle size has an obvious effect on physico-mechanical properties of briquette body as well as characteristics of coal and gas outburst. Some concrete manifestations are the smaller the particle size of the briquette body is，the bigger the fractal dimension of pore structure of coal sample is and the better its adsorption property on methane gas is. Meanwhile，the smaller particle size will make the higher strength of resistance to destruction of briquette body. The results also show that the briquette body with smaller particle size offers higher intensity of coal and gas outburst and exhibits more quantity of methane adsorption of coal before outburst；whereas，its crushing effect is proved to be less obvious than that of the briquette body with larger particles.
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Received: 25 December 2009
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