Integrative outburst prevention technique of high-pressure jet of abrasive drilling slotting

Coal and gas outburst is one main disaster in coal mine production, so it is very significant to prevent the coal and gas outburst effectively. Based on the stress-relief zone theory, we establish the stability condition of stress-relief zone in a coal mine laneway and find out the relationship between the stress-relief zone and the coal and gas outburst risk and analyze the function of stress-relief zone in preventing coal and gas outburst. The Technique of The High-Pressure Jet of Abrasive Drilling Slotting Integration combined with the techniques of The High-Pressure Jet of Abrasive Slotting and drilling is developed to prevent outburst. The combined new technique can improve the effective effected range of pressure relief zone around a single drilling-hole, which can reduce coal and gas outburst by combining "point" , "line", "surface", and "body" of the front of working face coal mass. The technique can reduce coal and gas outburst risk effectively and realize safe production. Practical engineering applications in YanJin NO.1 Mine of Chongqing Tianhong Mining Group indicate that this technique is effective, and can be applied to the relevant engineering projects.