Rock Mass Blastability Classification Using Fuzzy Pattern Recognition and the Combination Weight Method

Table 1

Classification standards of rock mass blastability.

Blastability class	(MPa)		(t/m^3)		(10^6 kg//s)	Characterization of blastability
I	≤1.5	≤2.5	≤2.0	≤0.15	≤3	Very easy
II	1.5–3	2.5–6	2.0–2.4	0.15–0.35	3–6	Easy
III	3–6	6–10	2.4–2.75	0.35–0.55	6–9	Moderate
IV	6–12	10–18	2.75–3.0	0.55–0.75	9–12	Difficult
V	≥12	≥18	≥3.0	≥0.75	≥12	Very difficult