In order to design and construct the underground structures rationally, accurate elastic shear modulus of soils is an important parameter. The real ground formed by sands and/or clay has usually anisotropic mechanical behaviour. Although many researchers have discussed the anisotropy of strength, anisotropy concerning deformation modulus under small strain level have not been deeply understood. Anisotropy can be classified as an inherent anisotropy and an induced anisotropy, and the former anisotropy is treated in this study. Specimens are made using Toyoura sand with changing the angle of sedimentation. Local small strain (LSS) tests, by which precise deformation modulus can be measured, and bender element (BE) tests were simultaneously conducted in the same specimens to examine the influences of inherent anisotropy on deformation modulus and strength under triaxial state of stresses. The results show that drained shear strength decreases with the angle of sedimentation direction, which is defined as the angle of the depositional plane from the vertical. On the contrary, elastic shear modulus increases with the sedimentation angle.
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