Calculation of the compression index and precompression stress from soil compression test data

By A. Gregory, W. R. Whalley, C. Watts, N. Bird, P. Hallett, A. Whitmore. 2006

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Soil Compressibility Models for a Wide Stress Range (2016, background): “Sigmoidal and Gompertz functions are special examples (Gompertz 1825; Gregory et al. 2006).”
Physical resilience of soil to field compaction and the interactions with plant growth and microbial community structure (2007, methodology): “A simple laboratory simulation carried out with a loading test frame on a wet sample of soil CY ( 5 kPa matric potential) by a similar methodology to Gregory et al. (2006) showed that water was expelled when compacted to 200 kPa (data not presented), as has been observed by others (Day & Holmgren,…”
The biological and physical stability and resilience of a selection of Scottish soils to stresses (2007, methodology): “where a, b, c and m are fitted parameters (Gregory et al., 2006).”
Prediction of the penetrometer resistance of soils with models with few parameters (2007, methodology): “We also used penetrometer resistance data from undisturbed cores at Roseworthy College, South Australia, reported by Groenevelt et al. (2001). This was a non-swelling soil and the resistance to penetration was measured with a 2 mm diameter cone with a penetration rate of 2 mm min on soil equilibrate”