A General Method to Incorporate Three-Dimensional Cross-Anisotropy to Failure Criterion of Geomaterial: Fid-Bau Portal

A General Method to Incorporate Three-Dimensional Cross-Anisotropy to Failure Criterion of Geomaterial

Chen, Haohua / Yang, Changyi / Li, Jingpei / Sun, De’an

Due to oriented internal structure and depositional direction, the strength of natural geomaterial is anisotropic and cannot be fully represented by the existing isotropic criteria. This paper proposes a simple and novel anisotropic fabric tensor to extend isotropic failure criteria to account for anisotropy in a general way. Both the cross-anisotropic strength and the depositional angle between the loading direction and depositional direction can be considered in the proposed method without introducing any additional parameters. Especially, the effect of the depositional direction is subtly considered by a generalized fabric tensor with the depositional angle and two friction angles under different loading directions as the basic parameters. Extensive parametric analysis indicates that the proposed method is versatile to introduce anisotropy to several existing isotropic criteria by a unified expression. Through comparisons with experimental results of five types of soil, the anisotropic criteria established by the proposed method show good performances in predicting the strength of cross-anisotropic geomaterials under general loading conditions as well as capturing the nonmonotonic effects of depositional direction.