Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage

Table 2

Test results of longitudinal wave velocity of rock specimens.

Specimen number	First measurement (μs)	Second measurement (μs)	Third measurement (μs)	Length of rock specimen (mm)	Wave velocity 1 (m/s)	Wave velocity 2 (m/s)	Wave velocity 3 (m/s)	Average wave velocity (m/s)
A1	47.2	48	47.75	201	4258	4187	4209	4218
A2	47.1	47.1	48.3	200.5	4256	4256	4151	4221
B2	49.05	48.9	49.25	201	4097	4110	4081	4096
B5	48.65	48.8	49.15	201	4131	4118	4089	4112.6
C4	49.1	49.8	49.2	200.5	4083.	4026	4075	4061.3
C5	49.15	49.55	49.65	201	4089	4056	4048	4064.3
D5	48.45	48.9	49	200.5	4138	4100	4091	4109.6
D6	49.1	48.60	48.4	200.5	4083	4125	4142	4116.6
E3	50.35	50.55	50.2	200.5	3982	3966	3994	3980.6
E6	50.65	50.25	51	200.5	3958	3990	3931	3959.6
F4	44.5	44.35	44.55	201	4516	4532	4511	4519.6
F5	45.2	44.85	45.2	201.5	4457	4492	4457	4468.6