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The soil compaction by vehicles is a major factor responsible for physicaldegradation of cultivated soils. Uniaxial confined compression tests areusually performed to characterise the compaction properties of soil. Two mainforms of compression curve have been observed: (i) the bi-linear curve havingan elastic rebound curve at low stresses and a linear virgin compression curveat higher stresses; (ii) the S-shaped curve having deviation of the virgincompression curve at high stresses. In the present work, uniaxial confinedcompression tests were performed on four soils having various textures anddifferent plasticity. Tests were performed on undisturbed and remould samples,at various initial dry bulk densities and water contents. The S-shapedcompression curves were observed more frequently when the clay content and/orthe initial water content were high. In addition, the S-shaped curves wereobserved more frequently on remould soils than on undisturbed soils. Thedifference between the compression of air-filled pores and that of meso-poresstoring water subjected to high capillary forces could explain the observedS-shaped curves.

Analysing the form of the confined uniaxial compression curve of various soils