Download Advances in Unsaturated Soils by Bernardo Caicedo; Carol Murillo; et al PDF

By Bernardo Caicedo; Carol Murillo; et al

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Figure 4. Digital micrometer used for the measurement of the diameter and thickness of shrinkage specimens. The shrinkage curve can be experimentally measured from initial high water content conditions to completely dry conditions. A digital micrometer can be used for the measurement of the volume at various stages of drying as shown in Figure 4. , the rings have no bottom). The rings with the soil can be placed onto wax paper and can be dried through evaporation to the atmosphere. The dimensions of the soil specimens are appropriately selected such that cracking of the soil is unlikely to occur during the drying process.

Indb 17 12/27/2012 4:57:15 PM 5 soil between various applied soil suctions. Rather, it is necessary to quantify the amount of volume change that occurs and to separate the volume changes that occur while the soil remains saturated from the volume changes (and water content changes) that occur as the soil desaturates. The estimation procedures for unsaturated soil property functions is different when the soil is undergoing volume change from the situation where there is no volume change as soil suction is changed.

All void ratio values were determined from the measured shrinkage curve. Figure 10 shows the difference between the break in curvature on the gravimetric water content SWCC and the true AEV obtained from the degree of saturation SWCC plotted versus percent volume change experienced by the soil. A starting water content equal to the residual water content meant that no volume change occurred and the ratio of the break in the gravimetric water content SWCC was equal to the break in the true AEV observed on the degree of saturation SWCC.

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