Research Article

Numerical Simulation for Rock Fracture Viscoelastic Creep under Dry Conditions

Figure 20

Normalized mean aperture and contact ratio of the seven surface pairs (shown in Table 3). The time is normalized by . (a) Normalized mean aperture changing with time for the seven surface pairs; (b) normalized contact ratio changing with time for the seven surface pairs. The formulae for normalized mean aperture and normalized contact ratio are shown in Equations (37) and (38), respectively.
(a) Normalized mean aperture
(b) Normalized contact ratio