Application of Pre-Splitting and Roof-Cutting Control Technology in Coal Mining: A Review of Technology

According to the development requirements of green mining coal resources, it is imperative improve extraction rate and application safe efficient technology. Pre-splitting roof cutting technology widely used in reducing residual pillars pressure relief mining, which has become crucial for pillar-free methods. Therefore, essential review discuss research hotspots, cutting-edge methods, principles action, areas this Above all, data on pre-splitting roof-cutting past ten years are summarized outlined. The research’s hot spots gob-side entry retaining Then, functional forms discussed compared, including explosive blasting (directional energy gathering blasting, liquid composite blasting), hydraulic fracturing, CO2 gas mechanized (chain arm saw machine directional rig). Through analysis field cases, divided into three major areas: non-coal pillar (gob-side driving with narrow pillar, filling body, completely retaining, “N00” construction method), at working face (thick hard main cracking end area cracking), roadway roadways). By detailing process each one by one, principle mode expounded. Finally, prospects new technical deep intelligent unmanned prospected, providing references similar projects.