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

Figure 7

The relationship between the shear stress, AE count rate, AE accumulative counts, and the test time for skarn joints under normal stress of 1.39, 2.08, 2.78, and 3.47 MPa, respectively.

(a)  MPa

(b)  MPa

(c)  MPa

(d)  MPa