Research on the Failure and Fracture Evolution of Mylonite with a Prefabricated Circular Opening by Discrete Element Method

Figure 9

Space-time evolution process of microcracks during loading: (a) 85,000 step before peak, (b) 94,120 step at peak, (c) 100,000 step after peak, and (d) 109,120 step after peak. 1: notch fractures; 2: far-field fractures; 3: shear damage.

(a)

(b)

(c)

(d)