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