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

摘要

Pressure-relief coal mine methane (CMM) surface gas venthole (SGV) hasteen 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 pressure-relief mining and the SGV. Based on this understanding, the performance of pressure-relief mining can be evaluated and the gas flow rates of SGV can be predicted. However, there is no empirical analysis and descriptive analysis on this topic is not sufficient currently.