Application of the Top-cutting Pressure Relief without Coal Pillar Mining Technology in Jincheng Mining Area

There are numerous coal mines in Jincheng area. Reducing the excavation rate is of great significance [1,2]. The traditional long-arm mining method requires two tunnels to be excavated in one working face, and the coal pillars left for protecting the tunnels result in low coal recovery rate and serious problems of resource waste [3]. The top-pressure relief without coal pillars mining technology uses blasting pre-cracking to cut the roof, supports the old roof, and utilizes the roof collapse of the working face to form the mining tunnel for the next working face. It not only improves the coal recovery rate but also realizes the Y-type ventilation mode, effectively solving the problem of excessive gas in the upper corner [4–6]. It plays a positive role in the safe production of high-gas mines. Through experiments and applications in a certain mine in Jincheng, the engineering effect is good. It fundamentally prevents the frequent occurrence of disasters caused by the left coal pillars, resource waste, tight mining succession, and difficult maintenance of tunnels, and has great engineering practical value and high economic and social benefits [7].