Research Article
Engineering Classification of Jointed Rock Mass Based on Connectional Expectation: A Case Study for Songta Dam Site, China
Table 1
A list of influencing factors considered in typical rock mass classification methods.
| Method | RSR | RMR | Q | Z | YZP | ET | China national standard | Number of factors |
| Proposed age | 1972 | 1973 | 1974 | 1979 | 1985 | 1985 | 1994 | | Number of joint sets | | | √ | | | | | 1 | Joint spacing | √ | √ | √ | | √ | √ | √ | 6 | Joint state | √ | √ | √ | | √ | √ | √ | 6 | RQD | | √ | √ | | √ | √ | √ | 5 | Rock mass structure | | | | √ | | | | 1 | Integrity | | √ | | √ | √ | √ | √ | 5 | Weathering | | | | | √ | √ | √ | 3 | In situ stress | | | √ | | | √ | √ | 3 | Groundwater | √ | √ | √ | | √ | √ | √ | 6 | Geological structure | √ | | | | | | | 1 | Rock strength | √ | √ | √ | √ | √ | √ | √ | 7 | Joint shear strength | | | | √ | √ | √ | | 3 | Rock mass deformation modulus | | | | | √ | √ | | 2 | Rock deformation model | | | | | √ | | | 1 | Rock mass elastic wave velocity | | | | √ | √ | | √ | 3 | Rock wave velocity | | | √ | √ | √ | √ | √ | 5 | Joint orientation | √ | √ | | √ | √ | | √ | 5 | Construction method | | | | √ | | | | 1 | Classification grade | 5 grades | 5 grades | 9 grades | 5 grades | 5 grades | 5 grades | 5 grades | | Engineering application | Tunnel support | Tunnel mining | Tunnel cavern | Dam foundation of underground engineering | Rock mass of dam foundation | Rock mass of dam foundation | Underground and ground slope | |
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