Resistência ao arrancamento de grampos em solo residual de gnaisse

• Ano de defesa: 2010
• Autor(a) principal: Beloni, Marcelo de Lima
• Orientador(a): Minette, Enivaldo
• Banca de defesa: Menezes, Stélio Maia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Engenharia Civil
• Departamento: Geotecnia; Saneamento ambiental
• País: BR
• Palavras-chave em Português: Solo grampeado; Ensaio de arrancamento; Resistência ao arrancamento
• Palavras-chave em Inglês: Soil nailing; Pullout test; Pullout resistance
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA
• Link de acesso: http://locus.ufv.br/handle/123456789/3736

The adoption of the soil nailing technique in the project of slope stability once or excavations it is being more and more frequent. This with it is reguire a larger number of studies about the estimate of the the pullout resistance (qs) in function of parameters of field tests for the most varied types of Brazilian soils.The objective of this research was to propose correlations for the qs resistence in function of field tests, and also to compare the results also found in the pullout test with dear in existent formulations. The study was accomplished in a slope of young gneissic residual soil, Viçosa - MG.In the field test they occurred the standard penetration test (SPT), Menard pressuremeter test (PMT), Marchetti dilatometer test (DMT) and pullout test in twelve nails, only made with no injection procedures. The assembly of the pullout test system was different from the proposal for other authors and it was shown effective.The qs values obtained in the pullout tests and the correlations found for each nails were compared using appropriate statistics for each analysis. The parameters of the field test used in the proposed correlations Nspt, PL, and P0, were certain for the average of your magnitudes along the nails. The pullout resistance found for each nails and the parameters obtained in the field tests they were plotted in dispersion graphs us which lineal and no-lineal regressions were applied in the intention of to evaluate which mathematical model was adapted better to each proposition. For the correlation qs x Nspt the logarithmic model presented larger correlation coefficient (R2) and significance (p <0,05), in the relationship qs x p0 the quadratic form obtained larger R2, however the behavior of the curve was not suitable with the one of the soil, being accomplished the option by the logarithmic model that was highly significant (p <0,01). The correlation qs X PL didn't show any statistically significant and the choice of the format of the lineal curve was based on the behavior of the soil, same not presenting the largest value of R2. In the case to to the proposed correlations it s possible to conclude that they can be used as initial estimate of project being indispensable the execution of pullout tests to prove the safety with relationship to the values of adopted qs.