Research Article
Rock Mass Classification for Columnar Jointed Basalt: A Case Study of Baihetan Hydropower Station
Table 4
Rock mass integrity classification.
| | Rock mass integrity | Intact | Relatively intact | Poor intact | Relatively fractured | Fractured |
| | Integrality index of rock mass | >0.75 | 0.75~0.55 | 0.55~0.35 | 0.35~0.15 | <0.15 | | Volumetric joint number (m3) | <3 | 3~10 | 10~20 | 20~35 | >35 | | Rock block size (%) | 80~100 | 50~80 | 25~50 | 15~25 | <15 | | Transverse hidden joint development degree (m) | >20 | 10~20 | 5~10 | 3~5 | <3 | | Intraformational faulted zones development degree (m) | >10 | 3~10 | 1.5~3 | 1~1.5 | <1 |
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