Energy Variation Law and Rockburst Characteristics of Coal under Cyclic Loading
Table 2
Statistics of roadway rockburst in the third mining area.
Frequency
Location of occurrence
Site description
1
Transportation roadway head-on 50 m backward
The floor heave is about 1 m, accompanied by dense and loud coal guns
2
Ventilation roadway corresponding to transportation roadway head-on 50 m forward
The floor heave is about 1.2 m, the roof is a seriously sinking or hanging bag, and many bolts (cables) in the roof and sides are broken, accompanied by dense and loud coal guns
3
Track roadway corresponding to transportation roadway head-on 50 m backward
The floor heave is about 0.5 m, one roof falls, and the bolts (cables) in the roof and sides are broken individually
