Research Article
Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling
Table 8
Cutting blasting parameters in grade III rocks [
32].
| | Hole type | Number of holes | Segments of detonators | Hole depth (m) | Charge quantity (kg) | | Single hole | Total |
| | Cuthole | First wedge | 8 | 1 | 3.3 | 2.40 | 19.20 | | Second wedge | 8 | 3 | 5.4 | 4.00 | 32.00 | | Central hole | 3 | 3 | 4.9 | 0.60 | 1.80 | | Third wedge | 8 | 5 | 5.1 | 3.80 | 30.40 | | Fourth wedge | 8 | 7 | 4.9 | 3.60 | 28.80 | | Fifth wedge | 8 | 9 | 4.7 | 3.50 | 28.00 | | Auxiliary hole | 30 | 11∼13 | 4.7 | 2.25 | 67.50 | | Periphery hole | 40 | 14 | 4.7 | 0.90 | 36.00 | | Bottom hole | 15 | 15 | 4.7 | 2.40 | 36.00 | | Total | 128 | | | | 279.70 |
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