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| | Abstract | | Rock mass classification has been widely used for designing and constructing engineering structures such as tunnels and dams. There are several classification methods such as RMR and Q-value, and the methods proposed by related organizations in Japan. As these methods, however, include some qualitative evaluation criteria, it has been long recognized that the rock mass classification strongly depends on those who make classification. We have, therefore, studied a classification method which can more quantitatively and objectively classify the rock grade with multiple geophysical data based on rock physics. This paper demonstrates an application of the proposed model to P-wave velocity and resistivity data acquired with seismic refraction and electric surveys on a planned route of a tunnel to estimate rock grades before and after excavation. The rock grade after excavation is determined based on P-wave velocity reduced due to loosening of the tunnel wall which is predicted by the model. Comparison with rock grades determined with the conventional way proves that the model-based method can be used for more quantitative rock mass classification. |
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