Stress-Dilatancy of Sands with Inherent Fabric Anisotropy for Direct Shear

World Multidisciplinary Earth Sciences Symposium

Szypcio, Zenon^1

Bialystok University of Technology, Faculty of Civil and Environmental Engineering, Wiejska 45E, Bialystok

15-351, Poland^1

关键词: Bedding planes;    Direct shear;    Fabric anisotropy;    Frictional angles;    Inherent anisotropy;    Literature data;    Shear plane;    Stress dilatancies;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/221/1/012012/pdf
DOI  :  10.1088/1755-1315/221/1/012012

来源: IOP

【 摘 要 】

Granular materials deposited under gravity present inherent fabric anisotropy. The mechanical properties of such materials depend on the angle between shear plane and bedding plane perpendicular to gravity direction. From the literature data of direct shear of glass beads, Fujian and mica sands, the stress-dilatancy relationships are analyzed based on Frictional State Theory. The angle of critical frictional state, and parameters and β may describe stress-dilatancy relationship for direct sheared granular materials with inherent anisotropy. It is shown that parameters and β are different for pre-peak and post-peak stage of shearing, contrary to isotropic sand behaviour. It is also shown that Taylor's and Bolton's relationships are correct only for some experiment for which the angle between shear and bedding plane is 0°. The critical frictional angle Φ° is almost equal to the residual angle of granular material.