Research Article
Rock Mass Quality Evaluation Based on Unascertained Measure and Intuitionistic Fuzzy Sets
Table 2
Standard of underground engineering rock mass quality evaluation.
| | Grades | RQD (%) | RW (MPa) | Kv | Kf | [L·(min·10 m)−1] |
| | I (stability) | >90 | >120 | >0.75 | >0.8 | <5 | | II (basic stability) | 75∼90 | 60∼120 | 0.45∼0.75 | 0.6∼0.8 | 5∼10 | | III (poor stability) | 50∼75 | 30∼60 | 0.3∼0.45 | 0.4∼0.6 | 10∼25 | | IV (instability) | 25∼50 | 15∼30 | 0.2∼0.3 | 0.2∼0.4 | 25∼125 | | V (extremely instability) | <25 | <15 | <0.2 | <0.2 | >125 |
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