Fracture Characteristics of Thick-Roof Coal Roadway Subjected to Duplicated Shock Waves

Rock burst is one of the most serious risks for underground coal mines, and associated dynamic waves generally cause roof falls large-scale shrinkage roadway. The roadway often seriously damaged by duplicated rock bursts. Previous research on propagation attenuation shock cannot explain well failure mechanisms surrounding under waves. To fill this gap, paper presents comprehensive fracturing process roadways affected repeated using field tests numerical analysis. A model as per UDEC Trigon logic was developed calibrated mine earthquake waves, during which a user-defined FISH function adopted to document quantity characteristics fractures (i.e., shear-slip tension). damage assessed based fractures. At same time, simulation analysed evolution trend zone fracture development area, agreed with tests. According spread extension in new support materials schemes were proposed applied at site. results show that scheme has controlled deformation effectively satisfied safety efficiency requirements mine.