Research on geological control mechanism of coal-gas outburst

Overall investigating into the current coal-gas outburst mechanisms at home and abroad,we analyzed the key factors influencing coal-gas outburst from the perspective of gas geology,such as deformed coal,gas and tectonism.Based on those results,the geological control mechanism of coal-gas outburst centering on gas outburst coal is tentatively proposed.It is pointed out the coal-gas outburst being as follows: in the face of coal wall,gas outburst coal with a certain thickness is extended to expansion and failure due to unloading mining,and permeability of coal seam increases;because of abundant coal bed methane(CBM) desorbing fast,a mixture of CBM and coal particles with higher kinetic energy has been formed instantly in front of the coal wall,like an explosives,and it results in avalanche damage of coal body.Taken the "10.20"mining calamity for example,the geological-control case for coal-gas outburst had been analyzed,and revealed the distribution of gas outburst coal based on gas-geological characteristics of coal mines in China’s Xinjiang Uighur Autonomous Region.