Stress-Deformation Analysis for Unsaturated Soils - Unsaturated Soil Mechanics in Engineering Practice - page 730

Figure 13.80 Relationship of volume-mass and stress state for till compacted dry of optimum
water content (after Ho et al., 1992).

Figure 13.81 Relationship of volume-mass and stress state for till compacted at optimum water
content (after Ho et al., 1992).

One-dimensional oedometer tests (or isotropically loaded
triaxial tests), pressure plate tests, and shrinkage tests pro-
vide the experimental data required to obtain the volume
change indices corresponding to volume-mass properties ver-
sus stress state variables for an unsaturated soil. These tests

can be performed using test procedures quite similar to those
used in saturated soil mechanics. The test results character-
ize the volume-mass relationships for an unsaturated soil on
the “limiting” planes of the three-dimensional volume-mass
constitutive surfaces.