Energy Ratio (E-R) for the Standard Penetration Test Based on Measured Field Tests

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dc.contributor.authorLukiantchuki, J. A.
dc.contributor.authorBernardes, G. P. [UNESP]
dc.contributor.authorEsquivel, E. R.
dc.contributor.institutionUniversidade Estadual de Maringá (UEM)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-11-26T17:41:45Z
dc.date.available2018-11-26T17:41:45Z
dc.date.issued2017-05-01
dc.description.abstractThe Standard Penetration Test (SPT) is often used to estimate the soil parameters for geotechnical design projects, using the N SPT index. However, these estimates are performed based on empirical correlations without any scientific basis. Moreover, the test has a large inherent results dispersion due to the use of different types of equipment and execution procedures. Since the N SPT index depends on the amount of energy that is effectively transmitted to the sampler during the hammer fall, it is fundamental to be able to estimate this energy. Given the importance of estimating the energy that reaches the SPT sampler, an instrumented subassembly was developed in order to simultaneously assess the amount of energy transmitted to the drill rods, at sections just above the sampler and just below the anvil. This paper presents a series of SPT experimental results carried out in two different sites located in the State of Sao Paulo, using two different equipment set-ups (with manual and automatic tripping mechanisms), enabling the assessment of the top and bottom energy ratio under different conditions. Results show that for hand lifting hammer and automatic trip hammer systems the difference in the energy ratio is not significant. However, the dispersion of the results for the hand lifting hammer system is more pronounced due to execution procedures, equipment and operators.en
dc.description.affiliationUniv Estadual Maringa, Dept Engn Civil, Maringa, Parana, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Engn Civil, Guaratingueta, SP, Brazil
dc.description.affiliationUniv Sao Paulo, Dept Geotecnia, Sao Carlos, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Engn Civil, Guaratingueta, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 2008/08268-4
dc.description.sponsorshipIdCNPq: 479001/2009-0
dc.format.extent77-91
dc.identifier.citationSoils And Rocks. Sao Paulo: Brazilian Soc Soil Mechanics & Geotechnical Engineering, v. 40, n. 2, p. 77-91, 2017.
dc.identifier.issn1980-9743
dc.identifier.urihttp://hdl.handle.net/11449/163372
dc.identifier.wosWOS:000412402600001
dc.language.isoeng
dc.publisherBrazilian Soc Soil Mechanics & Geotechnical Engineering
dc.relation.ispartofSoils And Rocks
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectpenetration test
dc.subjectSPT test
dc.subjectenergy
dc.subjectenergy ratio
dc.subjectdynamic instrumentation
dc.subjectfoundations
dc.titleEnergy Ratio (E-R) for the Standard Penetration Test Based on Measured Field Testsen
dc.typeArtigo
dcterms.rightsHolderBrazilian Soc Soil Mechanics & Geotechnical Engineering

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