Investigation on the Effect of Dynamic Frequency on Fracture Evolution in Preflawed Rock under Multistage Cyclic Loads: Insight from Acoustic Emission Monitoring

Figure 1

Preparation of the preflawed granite samples. (a) A water jet machine used to cut two flaws in intact rock. (b) Geometry size of the two flaws in rock samples. (c) Typical rock samples with an approach angle of 50° used to conduct mechanical test.

(a)

(b)

(c)