Estimation of Rock Burst Grades Using Rock Mass Strength

Table 12

Estimation criteria of rock burst grades under different conditions.

No. of sets	Rock burst estimation criterion
	Slight rock burst	Medium rock burst	Strong rock burst	Violent rock burst
1	>0.167	0.066∼0.167	0.012∼0.066	≤0.012
2	>0.167	0.062∼0.167	0.012∼0.062	≤0.012
3	>0.167	0.066∼0.167	0.012∼0.066	≤0.012
4	>0.156	0.066∼0.156	0.012∼0.066	≤0.012
5	>0.167	0.066∼0.167	0.019∼0.066	≤0.019
6	>0.167	0.066∼0.167	0.012∼0.066	≤0.012
7	>0.167	0.062∼0.167	0.012∼0.062	≤0.012
8	>0.167	0.066∼0.167	0.012∼0.066	≤0.019
9	>0.167	0.066∼0.167	0.012∼0.066	≤0.012
10	>0.167	0.062∼0.167	0.012∼0.062	≤0.012
11	>0.167	0.066∼0.167	0.012∼0.066	≤0.019
12	>0.167	0.066∼0.167	0.012∼0.066	≤0.012