Table 4 Energy consumption of rock cutting
From: A New System to Evaluate Comprehensive Performance of Hard-Rock Tunnel Boring Machine Cutterheads
Rock type | Cutterhead | Average breaking specific energy of center cutter (J/m3) | Average breaking specific energy of normal cutter (J/m3) | Average breaking specific energy of gauge cutter (J/m3) |
|---|---|---|---|---|
Migmatite | Robbins Elastic deformation stage | 2.81 × 105 | 2.72 × 105 | 3.32 × 105 |
Extrusion crushing stage | 1.66 × 106 | 1.63 × 106 | 1.71 × 106 | |
Crack coalescence stage | 3.62 × 106 | 3.51 × 106 | 3.90 × 106 | |
CRCC Elastic deformation stage | 2.81 × 105 | 2.72 × 105 | 3.10 × 105 | |
Extrusion crushing stage | 1.66 × 106 | 1.63 × 106 | 1.65 × 106 | |
Crack coalescence stage | 3.26 × 106 | 3.16 × 106 | 3.34 × 106 | |
Granite | Robbins Elastic deformation stage | 2.54 × 105 | 2.43 × 105 | 5.01 × 106 |
Extrusion crushing stage | 1.48 × 106 | 1.44 × 106 | 1.77 × 106 | |
Crack coalescence stage | 3.32 × 106 | 3.15 × 106 | 3.61 × 106 | |
CRCC Elastic deformation stage | 2.54 × 105 | 2.43 × 105 | 2.87 × 105 | |
Extrusion crushing stage | 1.48 × 106 | 1.44 × 106 | 1.56 × 106 | |
Crack coalescence stage | 2.99 × 106 | 2.83 × 106 | 3.10 × 106 |