Study on the shatter proneness and its test method of coal with high-pressure adsorbed gas

摘要

Coal and gas outbursts usually generate a large amount of coal fragment of various sizes. This phenomenon is assumed to be related to the exploding and shattering of coal containing high-pressure adsorbed gas when it is suddenly exposed. To verify this assumption, a laboratory device has been developed to test the shatter proneness of coal blocks at high pressure. Experiments were conducted by using coal blocks sampled from four different mines. The experiments show that if the gas pressure is high enough, all coal blocks can be shattered. The particle size of the shattered coal follows the Weibull distribution. Under specific gas pressure, the shatter proneness of coal can be represented by the scale parameter in the Weibull distribution function derived from experiments. This parameter represents the susceptibility of outburst and may be used as one of the outburst predictive indicators in the future.