Confined compression features and mathematical modeling of artificially structured soils with initial stress-induced anisotropy

To investigate the deformation mechanism and mechanical features of structured soils, the confined consolidation tests are performed on 4 groups of artificially initial isotropic and anisotropic structured soils with different bonding properties and remoulded soils. It can be seen from the compression curves that the structural yield stress of the structured soils exists obviously. As the bonding between soil particles break up gradually, the void ratios of the structured soils and remoulded soils tend to be similar. The higher the cement content, the higher the strength of the soil skeleton and the greater the structural yield stress. Because of the influence of the pre-consolidation pressure, the structural yield stress of the structured soils with initial stress-induced anisotropy is higher than that of the initial isotropic structured soils. The parameters in the expression of compression curve of the structured soils based on the theory of breakage mechanics for geological materials are determined, and the simulated results are compared with the test ones, which demonstrates that the numerical results can well reflect the compression properties of anisotropic structured soils.