关键词: 蠕变, 滑带土, 经验型蠕变模型, 加速蠕变, 红层

Abstract: Red bed slopes are widely distributed in Sichuan basin and its edge area, which brings great threat to human life and properties. Sliding soil creep is directly related to the long-term stability of the red bed slope. CSS-2901TS soil triaxial rheological test machine was applied to triaxial consolidated undrained triaxial compression creep test to study the creep characteristics of red bed slip soil. According to the results of creep test, and based on empirical model theory, the relationship of stress and strain is described by hyperbolic function, and the relationship of strain and time is described by Log-Modified function, so a new empirical creep model is established. The model parameters are calculated by using ε/D-ε curves, the Levenberg-Marquardt algorithm and the general global optimization method. The established model is used to identify the creep curves, and the correlation coefficients are above 0.97. The new model improves conventional empirical creep models that are difficult to identify the creep acceleration stage. The verification shows that the model can accurately describe the creep characteristics of the red bed slip soil.

Key words: creep, slip soil, empirical creep model, accelerated creep, red bed