Anisotropic dynamic properties evaluation of local sand in Bangladesh by cyclic triaxial test

Abstract

The sand shows an anisotropic behavior in reality. For this purpose, this research evaluated the anisotropic properties (i.e., strains, deviatoric stress, pore pressure, and Poisson's ratio) of the local sand in Bangladesh under the uniform sinusoidal loading by the cyclic triaxial test. The grain size distribution provided fundamental properties of sand, which were used during the triaxial test. The lateral strain of the local sand is 84.6 % higher than that of the vertical strain due to the lower stiffness in the lateral direction compared to the vertical. The maximum and failure Poisson's ratios are obtained to be 0.5 and 0.894, respectively. The failure Poisson's ratio indicates the worst condition of sand, which may not be suitable for the application in engineering practice. Also, the buildup of excessive pore pressure inside the sand particles indicates the liquefaction phenomenon. In addition, the decrement of the pore pressure from the peak point informs the failure condition of sand. However, these properties of the sand may help engineers in practice to know preliminary information.