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A Hyperbolic Model for Stress-strain Behavior of Unsaturated Soils

A new simple shear apparatus is fabricated which is capable of applying monotonic and cyclic load on soil specimens. A series of tests was conducted to study the pore pressures (or suction), volume change, and shear behavior of the soil samples with anisotropic consolidation pressure. The simple shear apparatus is capable of controlling as well as measuring pore-air and pore-water pressure in the specimen separately. Simple shear tests are conducted inside a special triaxial type cell and normal stress and confining pressure can be applied to the soil sample. A hyperbolic formulation for shear behavior of unsaturated soils is suggested and the general stress-strain behavior of unsaturated soil is illustrated as a proper constitutive relationship. The variation of initial shear modulus versus water content is estimated as an exponential function and the amount of variation of shear strength due to a change in water content are determined.