Theoretical Basis and Technical Method of Permeability Enhancement of Tectonic Coal Seam by High Intensity Acoustic Wave In Situ

Tectonic coal seams are characterized by soft, low permeability and high gas outburst. The traditional control method is the intensive drilling extraction in this seam, which not only large engineering quantity, cost, difficult to form holes efficiency, but also easy induce outburst, a problem for global mine control. To solve problem, controllable shockwave equipment developed author’s team successfully applied practice of enhancement combined with principles shock vibration sound wave generation attenuation evolution rock stratum, new idea loading roof floor seam proposed. first attenuates evolves into high-strength then enters loads achieve purpose increasing without damaging physical properties tectonic facilitating opening original fractures. According technical ideas, implementation scheme key parameters pre-extraction models designed, including penetration drilling, horizontal holes, shield tunneling acoustic working face, provides approach efficiency cost seam.