Stress-Dilatancy of Cambria Sand for Triaxial Tests at High Pressures

World Multidisciplinary Earth Sciences Symposium 2017

Szypcio, Zenon^1

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

15-351, Poland^1

关键词: Confining pressures;    Experimental test;    Frictional angles;    Plastic dilatancy;    Stress dilatancies;    Stress strain behaviours;    Three parameters;    Triaxial compression;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/2/022046/pdf
DOI  :  10.1088/1755-1315/95/2/022046

来源: IOP

【 摘 要 】

In this paper, the stress-dilatancy relationship of Cambria sand for drained triaxial compression and extension tests at high stress level is investigated. The stress dilatancy relationship is obtained by use of frictional state theory and experimental tests data published in literature. It is shown that stress-dilatancy relationship is bilinear, described by three parameters of frictional state theory: critical frictional angle and two other parameters. It is accepted that critical friction angle is independent of confining pressure. The two additional parameters are strongly dependent on confining pressure and different for initial and advanced stages. The point at which the values of these parameters change is termed as Transformation Shear Point. This point is not simply visible either in stress ratio-strain or the volume strain-shear strain relationship which are traditionally shown in soil mechanics papers. Transformation Shear Point is very characteristic in stress ratio-plastic dilatancy plane. Thus, stress ratio- plastic dilatancy is very important for describing stress-strain behaviour of soils. The relationship shown in the paper can be used in soil modelling in the future.