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

Figure 6

Impact parameters of center hole-drilling applied to each rock block: (a) hand-held Hydrotechnik tester; and impact parameters for (b) rock block A; (c) rock block B; (d) rock block D; (e) rock block C; and (f) rock block E.

(a)

(b)

(c)

(d)

(e)

(f)