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Geoenvironmental Disasters

Table 2 Rock Quality Designation (RQD) classification (Bieniawski 1989)

From: Slope mass rating-based analysis to assess rockfall hazard on Yogyakarta Southern Mountain, Indonesia

Description

RQD

RMRb value

Very good

90–100

20

Good

75–90

17

Moderate

50–75

13

Bad

25–50

8

Very Bad

< 25

3

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