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

By Bernardo Caicedo; Carol Murillo; et al

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The authors would suggest that both of the above-mentioned approaches be given consideration. A review of the research literature shows that modified apparatuses for geotechnical applications have already become a trend for measuring the SWCC. Alternate testing procedures have also been proposed in the research literature. In particular, the need for a modification to the determination of an appropriate SWCC has arisen in situations where the soil changes volume as soil suction is changed. , left branch in Figure 1).

As a result, all volume-mass properties can be calculated. One such apparatus is described along with a description of its benefits and limitations. 1 INTRODUCTION relationship between the amount of water in a soil and soil suction. Within unsaturated soil mechanics, the drying (or desorption) SWCC branch has received the most attention. Disturbance of the soil samples has historically been of limited concern, or at least neglected, in both agriculture and geotechnical engineering, with disturbed and remolded soil samples often being used for laboratory testing.

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. Estimation procedures that have historically been proposed for the calculation of unsaturated soil property functions assume that a decrease in water content corresponds to a decrease in the degree of saturation of the soil. This may not always be the case and consequently the estimation procedures will give erroneous results when either gravimetric water content or volumetric water content SWCCs are used to calculate unsaturated soil properties such as the permeability functions.

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