This paper presents an experimental investigation of the deformation characteristics of salt rock under different loading conditions. A simple empirical model for the evolution of fatigue deformation is proposed. The results clearly show that the fatigue deformation is strongly dependent on the applied frequency, stress, and loading rate. The higher the loading frequency, loading rate, and stress amplitude, the smaller the proportion of uniform deformation to the whole deformation phase; hence, the fatigue lifetime greatly decreases. The proposed model was validated with experimental results and was shown to be efficient in the prediction of the fatigue deformation tendency of rock salt under different loading conditions.

本文对盐岩在不同载荷条件下的变形特性进行了实验研究。提出了疲劳变形演化的简单经验模型。结果清楚地表明，疲劳变形在很大程度上取决于所施加的频率，应力和负载率。加载频率，加载速率和应力振幅越高，均匀变形在整个变形阶段的比例越小；因此，疲劳寿命大大降低。实验结果验证了该模型的有效性，表明该模型可有效预测不同载荷条件下岩盐的疲劳变形趋势。