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

By Bernardo Caicedo; Carol Murillo; et al

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The geotechnical engineer is called upon to undertake numerical modelling simulations of the drying process. Volume changes in excess of 100% are common, and failure to take volume change into consideration yields erroneous results during the drying simulation. Almost any situation where a soil starts under very wet conditions and is subjected to drying will result in significant volume change. The material may be initially saturated and may remain near saturation, as soil suction increases during the drying process.

Et al. (eds). Special Technical Publication No. 147, ASCE, Virginia, USA, 895–904. E. 2008a. The repeatability of soil water balances at the same site from year to year. In: Unsaturated Soils: Advances in Geo-Engineering. , et al. (eds), Taylor and Francis, London, UK, 889−894. E. 2008b. Near-surface movement of water in unsaturated soil during evapotranspiration. In: Unsaturated Soils: Advances in Geo-Engineering. , et al. K. 895–900. E. 2009a. Solar heating of the soil and evaporation from a soil surface.

3 EXAMPLES OF VOLUME CHANGE AS SOIL SUCTION IS CHANGED The conventional application of the SWCC for the estimation of unsaturated soil property functions commences with the assumption that the soil does not significantly change volume as soil suction is increased. This assumption may be reasonable for low compressibility sands, silts and dense coarsegrained soils. However, there are other situations where the geotechnical engineer must determine unsaturated soil property functions when the soil undergoes considerable volume change with changes in soil suction.

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