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| Silva,Anderson Rodrigo da; Lima,Renato Paiva de. |
| ABSTRACT There are many methods for determining precompression stress (σp), whose value is affected by the slope of the soil compression curve. This study was designed to evaluate the hypothesis that for a certain compression curve all methods used to determine σp present the same value and accuracy. The aim of this study was to compare the accuracy and the relationship among seven of these methods by computational simulation of soil compression curves under nine scenarios. The following methods were used: Casagrande, Pacheco Silva, intersection of the initial void ratio with the virgin compression line (VCLzero), and the regression methods based on 2 (reg1), 3 (reg2), 4 (reg3), and 5 (reg4) points for modeling the elastic curve. Under each scenario,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil stress; Soil compression curve; Soil compaction. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100413 |
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| Franco,Hélio Henrique Soares; Silva,Alvaro Pires da; Tormena,Cássio Antonio; Ferreira,Camila Jorge Bernabé; Nunes,Márcio Renato; Lima,Renato Paiva de; Libardi,Paulo Leonel. |
| Abstract: The objective of this work was to determine the measurement accuracy of the soil water matric potential (ψm) by puncture tensiometers with either rounded or pointed porous cups, installed with or without “soil mud”, and to compare the performance of these tensiometers with that of tensiometers equipped with mercury manometers. The experiment was conducted in a Ultisol, in a randomized complete block design, in a factorial arrangement with five replicates. Puncture tensiometers with rounded porous cups, installed with “soil mud”, present more elevated accuracy for ψm determination in a wider measurement range, resembling tensiometers equipped with mercury manometers in drying soil. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Puncture tensiometers; Rounded porous cup; Soil mud. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201291 |
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