精选优质文档-倾情为你奉上Control and prevention of gas outburstsMara B. Daz Aguado C. Gonzlez (International Journal of Coal Geology 69(2007)253-266)Abstract: Underground coal mines have always had to control the presence of different gases in the mining environment. Among these gases, methane is the most important one, since it is inherent to coal. Despite of the technical developments in recent decades, methane hazards have not yet been fully avoided. This is partly due to the increasing