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

Figure 9

Comparison of the test and calculated values of the creep model under normal stress (a) 0.78 MPa, (b) 1.56 MPa, (c) 2.34 MPa, and (d) 3.12 MPa.

(a)

(b)

(c)

(d)