Application of an Improved Cloud Model and Distance Discrimination to Evaluate Slope Stability

Table 1

Slope stability grades and empirical descriptions.

Rank	Description	Stability	Safety	Failures	Treatment
I	Very favourable	Completely stable	Completely safe	None	None
II	Favourable	Stable	Safe	Some blocks	Occasional
III	Fair	Partially stable	Moderately safe	Some joints or many wedges	Systematic
IV	Unfavourable	Unstable	Unsafe	Planar or big wedges	Important/corrective
V	Very unfavourable	Completely unstable	Dangerous	Big planar, soil-like failures	Re-excavation