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Journal of Geological Research
Table of Contents
Special Issues
Journal of Geological Research
/
2012
/
Article
/
Tab 6
/
Research Article
Engineering Geological Assessment of Diversion Tunnel of Bakhtiari Damsite (Biggest Two-Arch Concrete Dam in Southern Iran)
Table 6
Range of RMR values and description of the rock-mass class [
5
].
RMR
81–100
61–80
41–60
21–40
<20
Rock-mass class
I
II
III
IV
V
Description
Very good
Good
Fair
Poor
Very poor