Geophysical and geomechanical analysis of coal mass condition during directional hydraulic fracturing (DHF)

The article reveals the information about the technology of roof rock directional hydraulic fracturing (DHF) performance when the longwall face was operating under tough roof conditions. The authors justify the application of the DHF method. They developed a scheme for roof softening under mining and geological conditions of mine Yubileynaya. The article presents the description of technological processes during DHF implementation and gives the list of general and special tools used during the process. Based on the results of the measures taken, the authors made a conclusion in relation to the efficiency of the performed work. The authors assessed the qualitative characteristics of the measures aimed at roof softening. They implemented the approach to active roof physical and mechanical characteristics determination based on seismic survey data analysis. (paper)