Discussion on mechanism and influencing factors of deep dynamic disaster

Aiming at the complex problems of the inducing mechanism and influencing factors of deep dynamic disasters, based on the dynamic disaster of Hongyang No. 2 Coal Mine, the spatial distribution of disasters was calculated, and similar simulation experiments of dynamic disasters under different parameter conditions were carried out to study the mechanism and influence of disaster inducing factor.The results show that: the dynamic disaster of Hongyang Coal Mine is mainly concentrated in the high stress and stress concentration area with obvious regional features. Compared with pour out and press out, the change rule of typical prominence is more obvious. The fitting empirical relations between outburst intensity, distance and relative outburst intensity, gas pressure and initial velocity of emission in Hongyang Coal Mine are obtained.With the increase of gas pressure dynamic disasters changed(pour out-delivery-typical outburst), the critical value of gas pressure needed for outburst can be reduced by the quick release of in-situ stress, the index(Δp) has a significant positive effect on the outburst intensity.Pour out and delivery can be treated as coal after certain damage accumulation stage, the one-time failure instability, the key to highlight the launch is typical has high potential of coal and has good moment release conditions, outstanding process can be regarded as typical coal mechanical instability and high potential to highlight sustainable development of coal.When the dynamic determination index Cm meet simultaneously, typical coal and gas outburst occurs. If Cm is not satisfied soft coal bodies with local development or stress concentration will suffer from dumping or compression disasters.