A True Triaxial Test of Saturated Coarse Sand Under Different Loading Directions

Anisotropy is a general property of geomaterials, and transverse isotropy is the most common form of geotechnical anisotropy. Therefore, in the true triaxial test, the direction of the principal stress is different under different loading directions. The study of the constitutive properties of the different angles formed between the particle deposition directions is significant. Under the conditions of effective confining pressure of 200 kPa and medium principal stress coefficient of 0, 0.5 and 1, different sampling methods were used to conduct the drainage shear test of saturated coarse sand with α angles of 0°, 60° and 90° respectively, combined with experimental data to explore its stress strain and dilatancy characteristics. Finally, the criticality states under different alpha angles are analyzed.