Rock Crushing Analysis of TBM Disc Cutter Assisted by Ultra-High-Frequency Loading

Figure 11

Evolution characteristics of the rock crack azimuth of the ultrasonic vibration assisting disc cutter: (a)–(j) crack azimuth distribution at 10 sampling points.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)