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

/locate/procedia * Corresponding author. Tel.:+86-516 fax: +86-516 E-mail address: lbq21405@126.com. The 6th International Conference on Mining Science Technology Integrative outburst prevention technique of high-pressure jet of abrasive drilling slotting Lin Bai-quan*, Wu Hai-jin, Zhang Lian-jun, Lu Hai-long, Zhang Hai-bin, Meng Fan-wei School of Safety Engineering, China University of Mining and Technology, Xuzhou 221008, China Abstract 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. Key words: coal and gas outburst; stress-relief zone; high-pressure jet of abrasive slotting; abrasive drilling 1. Introduction In China, nearly half of the State-owned key coal mines are high-gas or coal and gas outburst mines, which is a serious threat to the safe production in coal mine. Moreover, with the increase