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Journal of Geological Research
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Special Issues
Journal of Geological Research
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2012
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Article
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Tab 4
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Research Article
Engineering Geological Assessment of Diversion Tunnel of Bakhtiari Damsite (Biggest Two-Arch Concrete Dam in Southern Iran)
Table 4
Ranges of RQD values and description of the five definite rock-mass classes [
1
].
RQD
0–25
25–50
50–75
75–90
90–100
Description
Very poor
Poor
Fair
Good
Excellent