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Advances in Civil Engineering
/
2020
/
Article
/
Tab 3
/
Research Article
Estimation of Rock Burst Grades Using Rock Mass Strength
Table 3
Rock burst grades using the ratio of
σ
c
to
σ
max
in CHEGI criterion
.
Index
Grades of rock burst
Slight
Medium
Strong
Violent
4∼7
2∼4
1∼2
<1
There is no groundwater activity in the area.