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Table 4 The condition of discontinuous plane classification (Bieniawski 1989)

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

Parameter

RMRb value

Length

< 1 m (6)

1–3 m (4)

3–10 m (2)

10–20 m (1)

> 20 m (0)

Gaps

- (6)

< 0,1 mm (5)

0,1–1 mm (4)

1–5 mm (1)

> 5 mm (0)

Roughness

Very rough (6)

Rough (5)

Moderate (3)

Smooth (2)

Very smooth (0)

Filling

- (6)

Hard

Soft

< 5 mm (4)

> 5 mm (2)

< 5 mm (2)

> 5 mm (0)

Weathering

None (6)

Slightly weathered (5)

Moderate (3)

Mainly weathered (1)

Very weathered (0)