“…Besides these two models, empirical methods like Q TBM [5,6], RME [7,8] and the computer aided approach [9,10] are also used which rely on well documented case histories. The literature reveals that the performance of the machine in TBM tunneling depends on (1) geological and geotechnical parameters in the excavation environment, (2) cutterhead design parameters and (3) machine operating parameters [11,12]. The first parameter includes rock strength, jointing conditions and drillability.…”