Multidimensional Analysis of Precursor Information of Rockburst during Loading and Unloading of Deep Diorite

Figure 12

Three-dimensional evolution diagram of the main frequency-time-amplitude of the same confining pressure and different unloading rates.

(a) 0.1 MPa/s

(b) 0.5 MPa/s

(c) 0.7 MPa/s

(d) 0.9 MPa/s