Data/hora: 11/06/2024 08:40:07

Provedor de dados: | 65
País: | Brazil
Título: | Precompression stress and compression index depend on the property used to represent the soil deformation in the compression curve
Autores: | Gubiani,Paulo Ivonir; Jong Van Lier,Quirijn de; Reichert,José Miguel; Goulart,Rafael Ziani; Fontanela,Eracilda.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Void ratio; Particle density; Soil bulk density.
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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000100076
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20141495
Formato: | text/html
Fonte: | Ciência Rural  v.46 n.1 2016
Fonte: | info:eu-repo/semantics/openAccess