Estimation of Rock Burst Grades Using Rock Mass Strength

Table 14

Various criteria for rock burst estimation.

Barton’s criterion			Rehman’s criterion		Tao’s criterion		CHEGI’s criterion		Modified criterion in this study
	SRF	Rock burst grade	SRFQ	Rock burst grade		Rock burst grade		Rock burst grade		Rock burst grade
2.5∼5	5∼10	Mild	5∼10	Mild	5.5∼14.5	Slight	4∼7	Slight	>0.167	Slight
					2.5∼5.5	Medium	2∼4	Medium	0.066∼0.167	Medium
<2.5	10∼20	Heavy	10∼20	Heavy			1∼2	Strong	0.012∼0.066	Strong
					<2.5	Heavy	<1	Violent	≤0.012	Violent

SRF and SRF_Q are stress reduction factor and modified stress reduction factor, respectively.