<正> A set of adaptable conditions classification of aquifer-protective mining in thelongwall coalface for shallow coal seams with thin bedrock was put forward
<正> Described the development of an Intrinsically Safe System for continuousmonitoring of load and convergence of powered roof supports installed at longwall f
<正> To make a better understanding of the mechanical characteristics of the sur- rounding rocks in the tailentry and headentry with different coal seam thickne