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

Figure 4

Variation in the elastic modulus at different unloading rates of 40 MPa confining pressure.

(a) 0.1 MPa/s

(b) 0.5 MPa/s

(c) 0.7 MPa/s

(d) 0.9 MPa/s