Application Practical of Hydraulic Flushing Increase Fractures in Outburst Coal Seam

To the problems of strip gas pre-drainage of coal roadway in soft and outburst coal seam，then the method of unloading and increase fractures was used，it introduced basic technology and principle of coupling increase fractures of through strata hole‘drilling- impact’, the practical results of increase fractures technology applied on outburst elimination measures of outburst coal seam area.The practical showed that，gas emission amount decreased about 8.8% in a day，and roadway driving safety was ensured，coal seam gas amount decreased 15%～20% at the same time，dynamic phenomenon decreased obviously，and coal seam gas emission was reached.