Evaluation of Cutting Performance of a TBM Disc Cutter and Cerchar Abrasivity Index Based on the Brittleness and Properties of Rock

The brittleness of rock is known to be an important property that affects the fragmentation characteristics in mechanized cutting. As interaction between cutting tool and (i.e., cutter forces, efficiency, s/p ratio, abrasivity) during mechanical strongly influenced by fragmentation, tools disc pick cutter) experience different behaviors depending on brittleness. In this study, relationships abrasivity rock, efficiency a Tunnel Boring Machine (TBM) were investigated for Korean types. was calculated mathematical relations uniaxial compressive Brazilian tensile strengths rock. evaluated forces specific energy from linear machine (LCM) test Cerchar index (CAI) test, respectively. results show significantly correlated with CAI values. Consequently, some prediction models energy, proposed as functions