Investigation on Acoustic Emission Kaiser Effect and Frequency Spectrum Characteristics of Rock Joints Subjected to Multilevel Cyclic Shear Loads

Figure 3

The designed loading path under CNL condition. (a) The set normal force of 5 kN, 7.5 kN, 10 kN, 12.5 kN. (b) Multilevel cyclic shear loading path.

(a)

(b)