Research Article
Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM
Table 4
Sieving test results of rock chips for different lithologies.
| | Group | Project | Lithology | Tunneling distance (m) | Sieving weight (kg) | Density (g/cm3) | Hardness | Surrounding rock integrity grade |
| | 1 | Lanzhou TBM 1 | Hornblende quartz schist | 16.700 | 263.165 | 2.82 | Hard | II | | 2 | 21.100 | 212.736 | | 3 | 31.500 | 175.072 | | 4 | Granite | 19.600 | 239.250 | 2.80 | | 5 | 13.500 | 214.140 |
| | 6 | Lanzhou TBM 2 | Sandy mudstone and siltstone interbedded | 17.600 | 215.173 | 2.54 | Soft | III | | 7 | 5.700 | 164.302 | | 8 | 25.533 | 119.761 | | 9 | 24.013 | 74.604 | | 10 | 22.075 | 194.366 |
| | 11 | Wananxi TBM | Quartz sandy conglomerate | 4.850 | 180.500 | 2.68 | Hard | II | | 12 | 13.610 | 174.300 |
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