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Unsaturated soils containing occluded air bubbles are commonly encountered in earthquake-prone areas and understanding their seismic compression behavior is of critical importance. This paper presents the results from a series of partially drained cyclic simple shear tests on sands having the same initial relative density but different initial degrees of saturation subjected to a range of cyclic shear strain amplitudes. The results indicate that increasing the shear strain amplitude led to an increase in the volumetric contraction. Further, the test results show that for shear strain amplitudes of 1% and 3%, the volumetric strains after 20 cycles are not strongly affected by the initial suction and degree of saturation. However, for a shear strain amplitude of 5%, the volumetric strain after 20 cycles is greatest for the soils that had a lower initial degree of saturation. In these tests, the degree of saturation was observed to increase while the matric suction decreased. The results indicate that unsaturated conditions may play an important role in seismic compression under partially drained conditions, but only under larger shear strain amplitudes.
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