摘要：AbstractA nonlinear regression model for peak-failure strength prediction of rockfill materials is proposed. It is based on the relationship between the peak-failure stress ratio and the normalized confining pressure as well as the relationship between the normalized peak-failure stress ratio and the exponent function of the intermediate principal stress ratio. This model can well predict the variations of the peak-failure stress ratio with the initial confining pressure and the intermediate principal stress ratio for different rockfill materials under different general stress paths. Comparisons of the measured and predicted results show that the peak-failure strength under the constant-p′ and constant-bpath is larger than that under the constant-σ3′and constant-bpath. The predictive capacity of the proposed model for the peak-failure stress ratio is better than that for the peak-failure friction angle.Graphical abstractDisplay OmittedHighlights•A nonlinear regression model was proposed for strength of rockfill materials.•The regression model could consider the pressure and generalized stress.•The peak-failure strength was dependent on the general stress path.
关键词：KeywordsenStress pathRockfill materialStrengthFriction angleStress ratio
