The Dynamic Response of Anisotropic Clay Soils with Applications to Soil Structure Analysis

摘要

Results of an investigation conducted primarily on cross anisotropic clays under small and large cyclic stresses are discussed. Experiments at small strains were conducted in the resonant column and those at large strains were conducted in a special pneumatic analog computer (SPAC) which applies to hollow cylinders of soil combinations of axial and torsional stresses. Under small strains, the effect on the moduli, represented by a modified Hardin and Black's equation, led to results which justify the use of non-linear theories in soil dynamics. Under large strains, the effects of one- and two-sided loadings were studied in axial and torsional modes. The shear modulus, its degradation, and damping were analyzed as a function of the level of stress and the cyclic number. The solution of a soil structure interaction problem was made possible by establishing a relation among the moduli of cross anisotropic saturated clays. The problem of the rigid circular plate resting on a cross anisotropic medium and subjected to sinusoidal loadings was solved in closed form. Examples using the design curves are given.