A Study of Rockburst Hazard Evaluation Method in Coal Mine

Table 3

Rockburst damage potential scale.

RDE	Rockburst damage scale	Expected working space damage	Expected support damage
		No damage/minor deformation	No damage/minor deformation
		Low reduction ratio of roadway section (0~20%), with normal production	Support system is loaded, with loose mesh and plates deformed
		Medium reduction ratio of roadway section (20%~40%), with a small influence on normal production	Some broken bolts
		Big reduction ratio of roadway section (40%~80%), with a big influence on normal production	Major damage to support system
		Huge reduction ratio of roadway section (80%~100%), with a serious influence on normal production even stopping production	Complete failure of support system