Research Article
Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage
Table 4
Physical parameters and impact drilling parameters of granite specimens.
| Specimen number | External diameter (mm) | Center hole diameter (mm) | Length (mm) | Mass (g) | Impact power (w) | Impact frequency (Hz) |
| A1 | 93.14 | 31.4 | 201 | 3374 | 1020 | None | A2 | 93.32 | 31.4 | 200.5 | 3378 | A3 | 93.09 | 31.6 | 201 | 3368 | A4 | 92.97 | 31.5 | 200.5 | 3361 | A5 | 93.04 | 31.5 | 201 | 3373 | A6 | 93.30 | 31.6 | 201 | 3393 |
| B1 | 93.32 | 31.8 | 200.5 | 3376 | 2602 | None | B2 | 93.44 | 31.8 | 201 | 3387 | B3 | 92.70 | 31.7 | 200 | 3330 | B4 | 93.26 | 31.8 | 200.5 | 3368 | B5 | 93.37 | 31.6 | 201 | 3395 | B6 | 92.60 | 31.44 | 201 | 3337 |
| C1 | 93.05 | 31.5 | 200.5 | 3359 | 4789 | 29 Hz | C2 | 93.20 | 31.5 | 201 | 3373 | C3 | 93.25 | 32 | 200.6 | 3370 | C4 | 93.10 | 31.7 | 200.5 | 3358 | C5 | 93.04 | 32 | 201 | 3366 | C6 | 93.15 | 32.1 | 200.5 | 3352 |
| D1 | 93.26 | 31.7 | 200.5 | 3377 | 4765 | 33 Hz | D2 | 93.20 | 31.5 | 200.5 | 3369 | D3 | 92.95 | 31.6 | 200 | 3356 | D4 | 93.30 | 31.8 | 201 | 3377 | D5 | 93.30 | 31.9 | 200.5 | 3386 | D6 | 93.24 | 31.8 | 200.5 | 3369 |
| E1 | 93.26 | 32.26 | 201 | 3369 | 4773 | 21 Hz | E2 | 93.40 | 31.90 | 201 | 3377 | E3 | 93.30 | 32.20 | 200.5 | 3370 | E4 | 93.20 | 32.30 | 200 | 3345 | E5 | 93.06 | 32 | 200.5 | 3341 | E6 | 92.88 | 32 | 200.5 | 3330 |
| F1 | 93.08 | 31.44 | 200.5 | 3372 | None | None | F2 | 93.20 | 31.20 | 199 | 3355 | F3 | 93.22 | 31.26 | 201 | 3403 | F4 | 93.31 | 31.30 | 201 | 3397 | F5 | 93.25 | 31.22 | 201.5 | 3410 | F6 | 92.84 | 31.20 | 201 | 3381 |
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