Deformability and strength of soils in calculation of high earth dams: Fid-Bau Portal

Deformability and strength of soils in calculation of high earth dams

Rasskazov, L. N. / Dzhkha, Dzh

Conclusions In the wake of other investigators, experimental investigations once again have shown that the strength of a soil depends to a considerable extent on the load trajectory, which can be characterized by the parameters λ, μ, and angle of rotation of the smooth planes α. The effect mainly of the parameter λ and to a lesser degree μ was investigated experimentally. As a result the limit surface was obtained for the case δ=5 kgf/$ cm^{2} $, which has a sixfold symmetry and six singular points. The curve of the limit surface between these points is convex.A check of the energetic strength condition on loamy sand and clay for positive values of μ and different values of λ showed its fulfillment and the possibility of realization when solving the problem on a computer. This was shown earlier for coarse-fragmental soils.A check of the energetic model of soil [1] made it possible to introduce certain corrections when describing the behavior of soil near the point of uniform compression. The refined soil model reflects well the deformability in the deviatoric stage of loading. This soil model was realized when solving the problem of the stress and strain of earth dams.Dilatancy is a property of nonlinearly deformable materials and can be described by deformability parameters on the section of uniform compression and distortion, but to accelerate the computation when realizing the soil model it is convenient to use an empirical formula.The refined soil model presented in the article permits taking into account such conditions as divergence in the position of the planes of principal stresses and strains and load trajectory, given in an implicit form in terms of the stagewise character of construction, limiting state, and unloading, which occurs in the upstream shoulder upon a rise of water in the upper pool.