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Routine geotechnical earthworks design is almost entirely based on laboratory test data obtained on soil specimens that are saturated, with little regard to the state of saturation that the soil is subjected to in the ground. Due to the influence of suction, soil stiffness and strength can be heavily influenced by the degree of saturation, especially for fine grained soils. There are many situations where the soil may be unsaturated for long periods of time, and given the current prediction for climate change (increasing hot dry summers) this may increase in the future. Therefore a detailed understanding of unsaturated soil behavior is desirable.
This paper presents the preliminary results from a number of tests conducted on unsaturated soils using a resonant column apparatus, which can determine the stiffness and associated damping of soils at small strain. Tests were conducted on reconstituted specimens at different water contents. This paper discusses the measurement of a specimen's suction and the resonant column testing conducted to date.
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