Research on the Identification of Precursor Information of Limestone Rockburst under Triaxial Unloading Conditions

Figure 3

Limestone stress-(cumulative) acoustic emission ringing count-time relationship curve at the same confining pressure with different unloading rates. Note: in the figure, the black vertical coordinate on the left side represents the stress magnitude during the loading of the limestone, the red vertical coordinate on the right side represents the acoustic emission ringing counts during the loading of the limestone, and the blue coordinate represents the cumulative ringing counts.

(a) 0.1 MPa/s

(b) 0.5 MPa/s

(c) 1 MPa/s