| Registro completo |
| Provedor de dados: |
Ciência Rural
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| País: |
Brazil
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| Título: |
Precompression stress and compression index depend on the property used to represent the soil deformation in the compression curve
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| Autores: |
Gubiani,Paulo Ivonir
Jong Van Lier,Quirijn de
Reichert,José Miguel
Goulart,Rafael Ziani
Fontanela,Eracilda
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| Data: |
2016-01-01
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| Ano: |
2016
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| Palavras-chave: |
Void ratio
Particle density
Soil bulk density
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| Resumo: |
ABSTRACT: During linear deformation (h) in a soil sample, the variation of the void ratio with respect to deformation (dε/dh) and the respective variation of soil bulk density (dρ/dh) are identical only for a specific value of h. Consequently, if two compression curves are drawn for the same soil sample, one using ρ and the other using ε, there are differences in both the calculated precompression stress (σp) and compression index (Ic). In this study, we highlight the causes by a mathematical analysis and an experimental investigation, quantifying the differences in σp and Ic when using ε and ρ. σp and Ic were calculated for 103 compression curves of an ultisol and 193 of an oxisol. The σp (kPa) using ρ (σpρ) was greater than when using ε (σpε), and differences were rather independent of the soil type. The relations found by linear regression relating σpρ to σpε were σpρ=0.8186σpε+34.202 for the ultisol and σpρ=0.8878σpε+34.875 for the oxisol. In contrast, the used soil property (ρ or ε) as well as soil type affected Ic. Ic calculated using ρ was greater than when using ε in almost all (96%) of the cases for the ultisol, and in only 12% of the cases for the oxisol. For a wide range of ρ, evidence from this study indicated that the use of ρ overestimates σp when compared to the use of ε.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000100076
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| Editor: |
Universidade Federal de Santa Maria
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| Relação: |
10.1590/0103-8478cr20141495
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| Formato: |
text/html
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| Fonte: |
Ciência Rural v.46 n.1 2016
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| Direitos: |
info:eu-repo/semantics/openAccess
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