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Article Dans Une Revue European Journal of Soil Science Année : 2010

Soil compaction by wheeling: change in soil suction due to compression

Yu-Jun Cui
Guy Richard

Résumé

Soil compaction due to traffic has been increasingly recognized as a considerable problem facing intensive agriculture. Most of the models used to estimate soil deformation during the passage of machines are based on the concept of total stress: then they have neglected an important stress variable for unsaturated soils, i.e. the matrix suction. The aim of the present work is to evaluate the validity of this hypothesis by studying suction variation during a static compression test. A standard oedometer cell equipped with a tensiometer was used to measure soil suction in situ for different vertical stresses. Measurements were carried out on remoulded soil samples obtained by compacting a loamy soil at different initial water suctions (< 100 kPa). The results showed that the suction remained almost constant until a stress threshold value t beyond which the suction decreased as the stress increased. This stress threshold increased with the initial suction. These results corroborated the hypothesis of a constant suction during deformation usually assumed to model soil compaction during traffic for soils with suction higher than 20 kPa. The results obtained highlighted the effect of soil structure on the stress threshold: t was found to be higher for soil samples with initial aggregates < 2 mm for those with initial aggregates < 0.4 mm. This was interpreted at pore scale by comparing qualitatively the evolution of pore-size distribution and the expected distribution of water in the pores. This interpretation was based on pore-size distribution measurement by mercury intrusion.
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Dates et versions

hal-00539589 , version 1 (24-11-2010)

Identifiants

Citer

Kai Cui, Pauline Défossez, Yu-Jun Cui, Guy Richard. Soil compaction by wheeling: change in soil suction due to compression. European Journal of Soil Science, 2010, 61 (4), pp.599-608. ⟨10.1111/j.1365-2389.2010.01245.x⟩. ⟨hal-00539589⟩
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