Hydromechanical behaviour of a marl on controlled suction oedometer path

Volumetric behavior of natural swelling soil on drying-wetting paths. Application to the Boumagueur marl -Algeria-

“…It can be concluded from these observations that identical increments of suction or mechanical stress produce the same change in void ratio (volume) as long as the material remains saturated. This joins the results of many authors such as: Benchouk et al, [4] Biarez et al, [7] Derfouf et al, [9] Li et al, [22] Lu et al [24] and Zerhouni. [42] .…”

“…It follows that the correlations of Biarez and Favre, 1975, established for C c and C s , remain applicable for I d and I w . (e.g., Benchouk et al, [4] Biarez et al [7] and Derfouf et al [9] )…”

“…The presentation of drying-wetting paths requires knowledge of the state parameters of the different samples, namely water content (w), dry density (γ d /γ w ), void ratio (e) and degree of saturation (Sr). The method for determination external (total) volumes of samples after equilibrium is based on a hydrostatic measurement in an oil used to fill the pores without swilling the sample (Tessier, 1975, cited in Derfouf et al [9] ). This oil, which is generally kerdane with density g k / g w of about 0.785, is not miscible with water and evaporates at 105 ° C.…”

“…These drying-wetting tests also show the interest of a global representation of the soil state during dryingwetting cycle. This representation makes it possible, in particular, to follow the saturation evolution of the soil and to relate the shrinkage -swelling or water retention behavior to suction (e.g., Alonso et al, [3] Derfouf et al, [9] Fleureau et al, [12] Tripathy et al, [36] Vanapalli et al, [37] Wang et al, [39] and Zhao et al [43] ). The enriching experimental data permitted the determination of compressibility (e.g., Maria et al [25] ), permeability (e.g., Van Genuchten [38] ) as well as shear strength (e.g., Fredlund et al [14] and Linchang et al [23] ) of different soils, in particular expansive clay.…”