Directional Hydraulic Fracturing (DHF) of the Roof, as an Element of Rock Burst Prevention in the Light of Underground Observations and Numerical Modelling

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method rock burst prevention, used in black coal mining with longwall system. In order to define changes seismic activity due DHF at “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding mass during system using roof layers collapse. was recorded area itself, where, on part runway, expanded before face wall by interrupting continuity DHF. presents measurements form number and shock energy observed longwall, which took place after use second unveils results numerical modeling discrete element method, allowing track formation goafs for variant that does not take into consideration, well modeled fractures tracing carried out accordance technology mine.