| 摘 要： | Based on the statistical data of 26 outburst prone coal seams in China, this paper presents the relationship among the threshold gas pressure in coal and gas outburst and the volatile content and hardness of coal by mathematical statistics. The threshold value of gas pressure for outburst Pmin, in MPa maybe calculated by formula Pmin=5(0.1 0.07V∫), where f is the hardness and V the volatile content (%) of a soft bed. In China, the value of Pmin of some outburst prone coal seams ranges from 0.57 to 0.1 MPa.
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