A Study of correlation between specific energy of tunnneling machine and crack frequency of mudstone

Yamazaki, Masanao; Fukui, Katsunori*; Minamide, Masashi*; Hatsuyama, Yoshihiro*

The correlation between the energy per unit excavated volume calculated from the electric power consumption of the road header during the shaft excavation and the rock properties observed at the excavation wall was investigated in the Horonobe Underground Research Project. As a result, it was found that the energy per unit excavated volume correlate better with the rock mass classification determined from both a fracture intensity as well as a rock strength rather than with a fracture intensity. We will continue to measure the electric power consumption data in order to establish rock mass evaluation method using the energy per unit excavated volume.