Shear and dilatational wave velocities for unsaturated soils

Evaluation of porosity and degree of saturation from seismic and electrical data

“…The model proposed in this paper utilises Archie's law to describe the electrical behaviour of soils and the recent formulation of wave propagation in unsaturated soils proposed by Conte et al (2009). The Archie's law, which holds for porous media with non-conductive solid grains (e.g.…”

“…The formulation of wave propagation, developed by Conte et al (2009), is based on the theory of linear poro-elasticity in conjunction with the constitutive relationships originally proposed by Fredlund & Morgenstern (1976) to describe the volume changes of unsaturated soils caused by changes in total stress and suction. The theory predicts the existence of three compressional waves and one shear wave in unsaturated porous media.…”

“…The proposed electro-seismic model is based on a simplified formulation of wave propagation in unsaturated soils proposed by Conte et al (2009) and on the Archie's law (Archie, 1942) that links electrical resistivity of soil with porosity, degree of saturation and electrical resistivity of the fluid. The model is applied to laboratory data to check its applicability.…”

Geotechnical Parameters from VP and VS Measurements in Unsaturated Soils

“…Recently, Conte et al (2009) presented a simpliˆed formulation that is based on the theory of linear poroelasticity in conjunction with the constitutive relationships originally proposed by Fredlund and Morgenstern (1976) to describe the volume changes undergone by unsaturated soils owing to changes in total stress and suction. The ex-pressions of VS and VP obtained applying this formulation to the case of low-frequency excitations, which is the most frequently encountered condition in the geophysical tests (Santamarina et al, 2001), are used in the present study to develop a procedure for evaluating the volumetric deformation coe‹cients of unsaturated soils at their undisturbed or natural state, once the measured values of P-wave and S-wave velocities, porosity and degree of saturation of the soil are available.…”

“…(A-6a) to (A-7b) into (A-2), (A-3) and (A-4), and performing a series of algebraic operations yield the stress-strain equations presented in main text (i.e., Eqs. (1), (2) and (3)) (Conte et al, 2009). …”