Fig. 8

Comparison between creep model of this paper and Nishihara model: (a) Confining pressure 5Â MPa; (b) Confining pressure 10Â MPa; (c) Confining pressure 15Â MPa; (d) Confining pressure 20Â MPa.

Comparison between creep model of this paper and Nishihara model: (a) Confining pressure 5Â MPa; (b) Confining pressure 10Â MPa; (c) Confining pressure 15Â MPa; (d) Confining pressure 20Â MPa.