Abstract: In order to study the generation mechanism and evolution of coal elastic potential energy in the process of coal and gas outburst, a coal elastic potential energy computing model was established, and orthogonal experimental design method was used for the quantitative analysis of the sensitivity to influencing factors.On the basis of the actual situation of the heading face Ji₁₅-24080 of No.10 coal mine in Pingdingshan, the relationship between excavation footage and coal elastic potential energy was discussed. The results show that the elastic potential energy is more sensitive to concentration coefficient of the abutment stress, the elastic modulus of coal and original effective stress, while it is less sensitive to the coal internal friction angle and Poisson's ratio,and that the coal elastic potential energy increases first and then decreases with the increasing of the excavation footage for the Ji₁₅-24080 working face, and when the excavation footage reaches 4.5 m, the coal elastic potential energy comes up the maximum value.

Key words: coal and gas outburst, coal elastic potential energy, influencing factors, sensitivity, orthogonal experimental design, quantitative analysis