Anisotropic shear strength behavior of a compacted soil and its application to slope stability analysis

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The purpose of this study is to clarify experimentally the anisotropic shear strength characteristics of a compacted soil and to develop a computer program for the slope stability analysis of embankments consisting of the soil considering the anisotoropic effect. The results may be summarized as follows :1.A number of triaxial compression tests were conducted on the samples extracted at various angles from a compacted model ground. Then an anisotropic shear strength equation has been derived from the Coulomb equation, Mohr circles at failure and the inclination angle of the failure plane in each specimen.2.Cohesion and angle of internal friction appearing in the shear strength equation are both functions of sample orientations. It is interesting to note that the functions have the same form as those proposed by McLamore et al.for anisotropic sedimentary rocks.3.The cohesion and angle of internal friction are also expressed as functions of the angle between the shear plane and the bedding plane in each specimen. Stability analyzes performed based on these functions show that the shear strength anisotropy leads to smaller values of the factor of safety and flatter critical slip surfaces in shape than those obtained from the isotropic shear strength assumption.