Study on comprehensive outburst elimination effect of hydraulic measures applied to coal mass

In order to study the comprehensive outburst elimination effect of the hydraulic measures, based on the comprehensive analysis on the applied effect of the hydraulic measures, the hydraulic measures could be a fracturing type and an open cut type. In combination with the hypothesis on the comprehensive effect of the coal and gas outburst, an analysis was conducted on the hydraulic measures affected to the pressure released effect of the coal mass, gas internal energy and coal phy sical property.The results showed that the hydraulic measures could reduce the load stress of the coal within a certain scope.The adsorbed gas of the coal mass would be changed by the environment gas pressure and would be affected by the moisture competitive adsorption, a pressure released and adsorption and the replaced adsor ption would be occurred, the water content could replace 59.14% of the absorbed gas and the gas internal energy would be reduced. After the measures applied, the m oisture content of the coal mass would be increased, the elastic modulus could be reduced by 58.69%, the plastic index could be increased over 4.3 times and the elast ic energy of the coal mass would be reduced.The hydraulic measures could reduce the load stress of the coal mass, gas internal energy and elastic energy of the coal mass and would have a comprehensive effect to the outburst elimination of the seam.In order to further improve the comprehensive outburst eliminated effect of the hyd raulic measures, during the hydraulic measures completed, an activator injected into the water should be considered to enhance the moisture effect of the coal mass.Th e fracturing type measures should have the pressure released borehole to eliminate the stress concentration effect at the crack tip.