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Advances in Civil Engineering
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Advances in Civil Engineering
/
2019
/
Article
/
Tab 5
/
Research Article
Selection of Optimal Threshold of Generalised Rock Quality Designation Based on Modified Blockiness Index
Table 5
Standard ratings of MB
i
.
MB
i
<7
7–27
27–55
55–85
≥85
Rating
I
II
III
IV
V
Description
Integrated
Relatively integrated
Poorly integrated
Relatively fractured
Fractured