UtilizaÃÃo do pressiÃmetro MÃnard na identificaÃÃo e previsÃo de recalques em um solo colapsÃvel

AUTOR(ES)

Karina Cordeiro de Arruda Dourado

DATA DE PUBLICAÇÃO

2005

RESUMO

This thesis presents a study involving pressuremeter tests (PMT) with main objective of evaluating variations in the behavior of a collapsible soil due to wetting, with application in design of shallow foundation. The studied area is the Agricultural School located in PetrolÃndia city, in a site with collapsible soils. The pressuremeter tests were performed in a period of dry season of the region, with the soil in the natural moisture condition and immediately after an impervious soaking process. The used equipment was a MÃnard GC Pressuremeter. The results of the tests were used to evaluate the effect of wetting in the parameters of the studied collapsible soil; to evaluate a collapsible identification and classification criterion; and to attempt a methodology to predict collapse settlements by PMT. The decrease in stiffness of the soil due to wetting was evident in the values of derived mechanical parameters, such as Pressuremeter Modulus (EP) and Limit Pressure (PL). In this study, values of PL have dropped as much as up to 65 times, after wetting. The results showed that pressuremeter test can be useful in the identification of layers with significant susceptibility to collapse. A preliminary classification proposal was presented. From the results of the tests performed in natural moisture content and soaked condition, a tentative was made to predict the collapse settlement by using the results of in situ collapse tests performed by SOUZA NETO (2004) in the studied area. The analysis showed that predicted collapse settlements were about 60% smaller than the measured values obtained in those tests. In general, the pressuremeter test proved to be a promising way for foundation design in collapsible soils, although needing further studies for the definition of an adequate methodology to settlement prediction in these soils

ASSUNTO(S)

solo colapsÃvel mecÃnica dos solos pressiÃmetro mÃnard engenharia civil

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