Experimental Study on Anisotropy of Granite Residual Soil

Inherent anisotropy and induced anisotropy are two main influencing factors on the engineering properties of granite residual soil. When preparing specimens of granite residual soil for undrained triaxial tests, large-sized specimens can be used to weaken the influence of sampling disturbance and inherent anisotropy, and K-0 consolidation is adopted to restore the soil specimens to the state of induced anisotropy. The experimental results indicate that, specimen size has no significant influence on the determination of static lateral pressure coefficient k(0), while specimen size and consolidation method obviously affect the stress-strain relationship and shear strength indices of granite residual soil. Undrained triaxial tests using large-sized specimens and the method of K-0 consolidation can provide parameters more suitable for engineering practice.