Table 9 SMR Adjustment Factor classification and the hazard rating (Romana 1993)
Slope condition | Very good | Good | Moderate | Bad | Very bad | |
|---|---|---|---|---|---|---|
F1 | P [αj - αs] | > 300 | 200–300 | 100–200 | 50–100 | < 50 |
T [αj - αs - 1800] | ||||||
W [αi - αs] | ||||||
P, W, T value | 0,15 | 0,40 | 0,70 | 0,85 | 1,00 | |
F2 | P [βj] | < 200 | 200–300 | 300–350 | 350–450 | > 450 |
W [βi] | ||||||
P, W value | 0,15 | 0,40 | 0,70 | 0,85 | 1,00 | |
T value | 1,0 | 1,0 | 1,0 | 1,0 | 1,0 | |
F3 | P [βj - βs] | > 100 | 00–100 | 00 | 00– (−10)0 | <(−10)0 |
W [βi - βs] | ||||||
T [βj + βs] | < 1100 | 1100–1200 | > 1200 | – | – | |
P, W, T value | 0 | −6 | −25 | −50 | −60 | |
F4 | Excavation Method | |||||
Method | Natural slope | Pre-splitting | Minor blasting | Mechanical excavation | Major blasting | |
Weight | 15 | 10 | 8 | 0 | −8 | |
Information: | Â | Â | Â | Â | Â | |
P = Planar failure | αs = slope strike |  |  |  | ||
W = Wedge failure | αj = discontinuous plane strike |  |  | |||
T = Toppling failure | αi = plunge direction of discontinuous plane | |||||
βs = slope dip | ||||||
βj = discontinuous plane dip | ||||||
βi = plunge dip of discontinuous plane | ||||||