Title: Consolidation Characteristics of Anisotropic Normally Consolidated Cohesive Soil Under Axi-Symmetric Loading Conditions
Abstract: The ratio of axial strain to volumetric strain is constant (=1/3) in Lambe's stress-path method to predict consolidation settlement under three-dimensional stress-strain conditions such as a circular footing resting on a thick bed of clay. It is consistent to use the strain ratio as constant, assuming that the behavior of soil is isotropic and linear elastic. It is, however, more consistent that the ratio is not constant when the behavior is generally anisotropic and nonlinear. In anisotropic and nonlinear case, the ratio should be determined with not only stress path but also stress level according to the three-dimensional conditions. It is revealed that the strain ratio decreases logarithmically when the effective stress increment ratio and the mean effective stress increase from a series of stress-path controlled triaxial tests. Equivalent elastic parameters and which express the characteristics of the strain ratio have been proposed in this study, assuming the soil as a cross-anisotropic elastic material. Based on the characteristics of the stain ratio, a modified method to estimate the settlement under three-dimensional conditions also has been proposed in this study. To verify the proposed method, the model tests simulating rigid circular foundation on clay subsoils were carried out. It is found that the poposed method predicts well the settlements under axi-symmmetric loading condition.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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