Evaluating pressure-relief mining performances based on surface gas venthole extraction data in longwall coal mines

Pressure-relief coal mine methane (CMM) surface gas venthole (SGV) has been successfully implemented and accepted as a CMM exploitation and outburst prevention technology. This includes the post-drainage of the protective seam, as well as the pre-drainage of the protected seam with low permeability that is affected by the pressure relief caused by the protective seam mining. Thus, it is important to understand the correlation between the...