Abstract
The strength of unsaturated loess was explored with triaxial instrument for unsaturated soils. The test covered 3 different water contents of unsaturated loess and the saturated loess at initial confining pressures of 100 kPa, 200kPa and 400 kPa. The matric suction and volume change were obtained during shearing procedure. Test results showed that the shear of saturated and unsaturated loess was strain-hardening with no obvious peak and contracted in volume. The matric suction during shearing was affected by both stress state and initial moisture content. The internal friction angle remained unchanged basically with variation of initial water content, and total cohesion decreases with an increase of initial water content, which can be expressed by an exponential expression.
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