Formation and Disposition of High Stress Region in Large Dip Angle Thick Coal Seam Fully Mechanized Working Face After Blasting and Pressure Relief

After blasting and pressure relief in mine pressure dynamic dangerous prediction region of Wangjiashan Coal Mine 47407 large dip angle thick coal seam fully mechanized working face mining roadway, there is a problem of high pressure appearance in the middle section of the working face (arc section) during mining. Through the field observation of pressure distribution of the working face before and after blasting and based on the theory of elastic-plastic, overlying coal rock model is established; through UDEC numerical simulation results, it is concluded that there is a direct cause of "high stress transfer area" due to the existence of blind zone in the middle part of the working face (arc section) at last. Based on this, after designing the inverted "八" blasting hole in the lower exit of working face for blasting on coal rock mass above the working face, we succeed in getting rid of danger for high stress transfer area, cut off high stress transfer path. Since then, after blasting and pressure relief in the work face of mining roadway in prediction area during production, the problem of strata behaviors in the middle part of the working face disappeared, which ensured safety production.