Abstract
Experiments were performed to investigate the effects of initial matric suction and net confining pressure on the small-strain stiffness and shear strength of reconstituted unsaturated sand. A series of constant water content tests was carried out using a modified triaxial apparatus equipped with local displacement transducers and bender elements. Reconstituted sand specimens were allowed to equalize at the required matric suction under net confining pressure using the axis- translation technique before shearing. After reaching matric suction equilibrium, shear wave velocities were measured prior to shearing. Multi-stage shearing tests were performed in order to investigate the effect of initial matric suction using the same specimen. The experimental results showed that at each net confining pressure, small-strain stiffness and peak shear strength showed a nonlinear relationship with matric suction with the change point near the air-entry value of the soil-water characteristic curve. Relationship between small-strain stiffness and net confining pressure was observed to be similar for saturated and unsaturated sands.
| Original language | English |
|---|---|
| Journal | Geotechnical Testing Journal |
| Volume | 34 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Sept 2011 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- Geotechnical Engineering and Engineering Geology
Keywords
- Matric suction
- multi-stage
- Sand
- Shear strength
- Small-strain stiffness
- Triaxial test
- Unsaturated