Energy GeoEngineering Laboratory

paper - soil compressibility models

Soil Compressibility Models for a Wide Stress Range

Chong, S.H and Santamarina, J.C. (2016) "Soil Compressibility Models for a Wide Stress Range". Journal of Geotechnical and Geoenvironmental Engineering , vol 142(6)
Chong, S.H and Santamarina, J.C.
Soil compressibility models; Compression index; Remolded clays; Natural sedimentary clays; Tangential stiffness; Small-strain stiffness; Yield stress
Soil compressibility models with physically correct asymptotic void ratios are required to analyze situations that involve a wide
stress range. Previously suggested models and other functions are adapted to satisfy asymptotic void ratios at low and high stress levels; all
updated models involve four parameters. Compiled consolidation data for remolded and natural clays are used to test the models and to
develop correlations between model parameters and index properties. Models can adequately fit soil compression data for a wide range of
stresses and soil types; in particular, models that involve the power of the stress σ 0β display higher flexibility to capture the brittle response of
some natural soils. The use of a single continuous function avoids numerical discontinuities or the need for ad hoc procedures to determine the
yield stress. The tangent stiffness—readily computed for all models—should not be mistaken for the small-strain constant-fabric stiffness.