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Advisor(s)
Abstract(s)
A tese que se apresenta, expõe o estudo de aplicabilidade do ensaio edométrico,
nomeadamente com recurso à instrumentação de três edómetros, a uma areia
siltosa, existente na cidade de Bragança, sendo que objetiva a aplicabilidade do ensaio
aos solos de granulometria mais fina da região, com a ressalva de que a curva
granulométrica destes se afasta de forma substancial das curvas granulométricas dos
solos que por norma são alvo do ensaio edométrico.
Objetiva assim o estudo efetuado, a aplicabilidade do ensaio aos solos mais
finos oriundos de uma região com predominância de maciço residual granítico.
Dado que o solo ensaiado apresenta características pertencentes aos dois tipos
de solo mais comuns no âmbito da geotecnia, a presente tese, foca as características
fundamentais destes dois grupos, dando especial enfoque aos solos finos.
Estando o processo de consolidação, associado à existência de estratos compressíveis
no solo de fundação, que muitas vezes dão origem a assentamentos mais
ou menos pronunciados, cuja velocidade e magnitude dependem dos parâmetros físicos
e mecânicos do solo, e do valor da tensão que neles se induz, a presente tese,
para além da determinação dos parâmetros referidos, enfoca, no domínio da mecânica
clássica, um estudo acerca da indução de tensões, provenientes de diferentes
tipos de fundações superficiais.
Em termos de resumo, o estudo efetuado apresenta ainda um exemplo, onde
se estima o valor da magnitude de assentamento, em um maciço constituído por dois
estratos compressíveis, materializados nos dois solos ensaiados, solicitados pelo valor
da tensão induzida por duas sapatas de labo !, afastadas de !, e desenvolvimento
infinito ", na consideração de estrato confinado, onde se poderá observar a delicadeza
com que estes maciços deverão ser tratados, nomeadamente o baixo valor da
tensão a que deverão ser solicitados, para que neles não ocorram assentamentos
excessivos, sendo que dos resultados de laboratório obtidos, se permite aferir a aplicabilidade
de ensaio aos solos que evidenciem plasticidade, nomeadamente os relativos
à região envolvente.
This thesis exposes the applicability study of the oedometer test, in particular, with the use of three instrumented oedometers, to an existing silty sand soil, from the city of Braganza, aiming the applicability of the test to the finest soils in the region, considering that the granulometric curve of these soils are substantially different from the granulometric curves of the soils that are usually tested. According to this, the study aim the applicability of the test to the fine grain soils from a region with a predominance of granitic residual soils. Due to the tested soil characteristics belong to the two most common types of soil from geotechnics point of view, this study focuses the fundamental characteristics of these two groups of soils, with a special focus on fine grains soils. Since the consolidation process, associated to the existence of compressible strata, which often give rise to more or less pronounced settlements, whose speed and magnitude depend on the physical and mechanical parameters of the soil, and the magnitude, of the induced stress, the present thesis, in addition to the determination of the referred parameters, focuses, in the field of classical mechanics, a study about the induced stress, coming from different types of surface foundations. In resume terms, the present study also gives an example for the estimate value off the settlement magnitude, on two compressible strata, materialized in the two types of soil tested, with the induced stress from two foundations with ! side length, distanced from ! length, both foundations with infinite side length ", in confined stratum situation, evidencing the delicacy associated to the soil strata, namely the low induced stress value to which they should be requested to avoid major settlements. In addition to this, the results obtained from the laboratory, allows to say, that it´s possible to apply the oedometer test to the soils from the surrounding region that evidence some plasticity.
This thesis exposes the applicability study of the oedometer test, in particular, with the use of three instrumented oedometers, to an existing silty sand soil, from the city of Braganza, aiming the applicability of the test to the finest soils in the region, considering that the granulometric curve of these soils are substantially different from the granulometric curves of the soils that are usually tested. According to this, the study aim the applicability of the test to the fine grain soils from a region with a predominance of granitic residual soils. Due to the tested soil characteristics belong to the two most common types of soil from geotechnics point of view, this study focuses the fundamental characteristics of these two groups of soils, with a special focus on fine grains soils. Since the consolidation process, associated to the existence of compressible strata, which often give rise to more or less pronounced settlements, whose speed and magnitude depend on the physical and mechanical parameters of the soil, and the magnitude, of the induced stress, the present thesis, in addition to the determination of the referred parameters, focuses, in the field of classical mechanics, a study about the induced stress, coming from different types of surface foundations. In resume terms, the present study also gives an example for the estimate value off the settlement magnitude, on two compressible strata, materialized in the two types of soil tested, with the induced stress from two foundations with ! side length, distanced from ! length, both foundations with infinite side length ", in confined stratum situation, evidencing the delicacy associated to the soil strata, namely the low induced stress value to which they should be requested to avoid major settlements. In addition to this, the results obtained from the laboratory, allows to say, that it´s possible to apply the oedometer test to the soils from the surrounding region that evidence some plasticity.
Description
Keywords
Consolidação Argila Indução de tensão