Moisture migration during loading and shearing of unsaturated sand
Department of civil and structural engineering, University of Sheffield, Mappin Building Street, Sheffield S1 3JD, UK
A series of drained unsaturated direct shear tests were conducted on a fine sand where suction was controlled by means of a hanging water column. A rise in the water level in the column was observed in conjunction with normal stress application for unsaturated samples. During shearing, the water level in the column also increased indicating continued water content loss from the sand. This is over and above any change in saturation that would arise due to volume change. Samples taken after the test for water content measurement confirmed the observed effect. Discussion of the phenomenon in the context of the soil water characteristic curve (SWCC) is presented and a simple hypothesis to explain this behaviour is proposed.
© The Authors, published by EDP Sciences, 2016
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