Skip Navigation LinksHome > August 2012 - Volume 177 - Issue 8 > In Situ Subsoil Stress-Strain Behavior in Relation to Soil P...
Soil Science:
doi: 10.1097/SS.0b013e318262554e
Technical Article

In Situ Subsoil Stress-Strain Behavior in Relation to Soil Precompression Stress

Keller, Thomas1,2; Arvidsson, Johan2; Schjønning, Per3; Lamandé, Mathieu3; Stettler, Matthias4; Weisskopf, Peter1

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Abstract

Abstract: Soil compaction negatively influences many important soil functions, including crop growth. Compaction occurs when the applied stress, σ, overcomes the soil strength. Soil strength in relation to compaction is typically expressed by the soil precompression stress, σpc. Deformation is assumed to be elastic and reversible as long as σσpc. This work examined soil stress-strain behavior as measured in situ during wheeling experiments and related it to the stress-strain behavior and σpc measured on soil cores in uniaxial compression tests in the laboratory. The data analyzed were from a large number of wheeling experiments carried out in Sweden and Denmark on soils with a wide range of texture. Contradicting the concept of precompression stress, we observed residual strain, [Latin Small Letter Open E]res, at σσpc. These observations were supported by stress-strain data measured in uniaxial compression tests, which likewise showed [Latin Small Letter Open E]res > 0 at σσpc. Residual strain was observed in the field when σ exceeded approximately 40 kPa, and when the ratio σ/σpc exceeded roughly 0.1, although [Latin Small Letter Open E]res was very small at σ/σpc < 0.5. These values were similar to those obtained on confined uniaxial compression curves. On the basis of our findings, we question the use of σpc as a measure of soil strength and call for a reevaluation of the precompression stress concept.

© 2012 Lippincott Williams & Wilkins, Inc.

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