Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

Figure 4

Shear displacement-time curves under different normal stresses: (a) 0.78 MPa, (b) 1.56 MPa, (c) 2.34 MPa, and (d) 3.12 MPa.

(a)

(b)

(c)

(d)