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Article Dans Une Revue Geoderma Année : 2010

Quantifying the effect of matric suction on the compressive properties of two agricultural soil using an osmotic oedometer

Yu-Jun Cui
Guy Richard

Résumé

The compaction of cultivated soils by agricultural machines considerably affects both the structure and physical properties of soil, thus having a major impact on crop production and the environment. The soil mechanical strength to compaction is highly variable both in time and space because it depends on soil type (texture), soil structure (porosity) and soil moisture (suction). This paper is devoted to the effect of soil suction on the compression index Cc which is one of the mechanical parameters that describes the soil mechanical strength to compaction. We used an oedometer compression tests with suction control implemented by using the osmotic technique to study the compression index of a loamy soil and a sandy soil. Soil samples were prepared by compacting soil powder passed through 2 mm sieve, to a dry bulk density of 1.1 or 1.45 Mg m-3. The mechanical stress and the suction ranges considered corresponded to field conditions, with vertical stress less than 800 kPa and suction less than 200 kPa. The results show that the compression index Cc changed little with suctions ranging from 10 to 200 kPa for the two soils at different initial densities. By contrast, the variation of Cc is significant when soil suction is close to zero for the loamy soil at an initial dry bulk density of 1.1 Mg m-3. From a practical point of view, this variation in compression index with suction is a useful result for modelling soil strain due to traffic and predicting the compaction of cultivated soils.
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Dates et versions

hal-00539602 , version 1 (24-11-2010)

Identifiants

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Kai Cui, Pauline Défossez, Yu-Jun Cui, Guy Richard. Quantifying the effect of matric suction on the compressive properties of two agricultural soil using an osmotic oedometer. Geoderma, 2010, 156 (3-4), pp.337-345. ⟨10.1016/j.geoderma.2010.03.003⟩. ⟨hal-00539602⟩
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