Experimental Investigation of the Anomalously Low Friction Phenomena in Blocky Rock Systems

Figure 4

Vertical displacements of rock blocks with different disturbance energies: (a) 50 mJ; (b) 150 mJ; (c) 250 mJ; (d) 300 mJ. Positive values indicate the compression displacements, while negative ones do the opposite.

(a)

(b)

(c)

(d)