Abstract
In this paper, saturated fine-grained sand of the Nam O formation (referred to henceforth as Nam O sand), which is widely distributed along the coastal plains in Central region of Vietnam, was tested by several series of uni-directional and multi-directional cyclic shears for a wide range of shear strain amplitudes and various cyclic shear directions and number of cycles. This paper presents the cyclic shear-induced effective stress reduction and the post-cyclic settlement that were observed under the effects of such cyclic shearing conditions. The cyclic shear direction strongly affects the effective stress reduction and post-cyclic settlement of Nam O sand for a small shear strain amplitude, these effects decrease, as the shear strain amplitude increases, and become negligible when the shear strain amplitude is larger than 1.0%. The liquefaction resistance of Nam O sand can be shown by relations between the shear strain amplitude and number of cycles, and also by those between the shear strain amplitude and cumulative shear strain for various cyclic shear directions. The minimum cumulative shear strain required for liquefaction of Nam O sand under the uni-directional and multi-directional cyclic shears was obtained.
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