Study of Post-peak Stress-Strain curves of geo-materials based on Hoek-Brown Criterion

Hoek-Brown criterion is provided in FLAC3D software, but it is rarely applied. The main reasons is that the corresponding post -peak parameters are difficult to obtain. In the article aiming at Hoek-Brown criterion, evolution of different strength parameters and the corresponding stress-strain curves are studied by means of numerical analysis. Results show that the post-peak part of the stress-strain curve is much influenced by the evolution process of strength parameters and the confining pressure. The presented study may provide a heuristic method to determine the law of post-peak evolution of strength parameters of Hoek-Brown criterion.