Characteristics and Mechanical Mechanism of In Situ Unloading Damage and Core Discing in Deep Rock Mass of Metal Mine

Figure 5

Strain-time-wave speed count rate curve (a) sample in 1816 m, (b) sample in 1879 m, (c) sample in 1920 m, and (d) sample in 2008 m.

(a)

(b)

(c)

(d)