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Table 1 Uniaxial Compressive Strength (UCS) classification (Bieniawski 1989)

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

Description

Compressive Strength (MPa)

RMRb value

Extremely strong

> 250

15

Very strong

100–250

12

Strong

50–100

7

Moderate

25–50

4

Weak

10–25

2

Very weak

2–10

1

Extremely weak

1–2

0