Avaliação de métodos de estimativa da capacidade de carga de fundações diretas em solos não saturados

• Ano de defesa: 2018
• Autor(a) principal: Almeida, Marcela Moreira da Rocha
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Geotecnia; Solos não saturados; Fundações (Engenharia); Bearing capacity; Shallow foundations
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/29818

The estimation of the load capacity of direct foundations can be obtained through formulated for saturated or completely dry soils, which rarely occur, and through semi-empirical methods or load tests. If the use of plate load tests with direct soil application, the results will be very influenced by the unsaturated condition in which the soil profile is. No solo not saturated, the water meets the pressure below atmospheric pressure (presence of suction) and in this condition the state of effective stresses is strongly influenced, as well as the soil rigidity and shear strength. Therefore, for determination of the load capacity of a surface foundation, it becomes extremely important to definition of the suction profile in the application of these more realistic theoretical formulations. That This research tries to analyze, experimentally and analytically, the behavior of a not saturated with regard to the load capacity of direct foundations. For this, Initially two direct load tests were carried out in the Experimental Field of Foundations of the Federal University of Ceará, with soil under different saturation. After that, the soil moisture was determined in each of the tests and the the two situations were estimated through the retention curve obtained by the through filter paper testing. A number of suction profiles were then soil tested according to the methodology proposed by Lu and Likos (2004), varying the level of the water table and the results showed that these water level positions do not generate great influence on the suction profile of the soil in question, since it was a massive predominantly sandy. From there, the proposals of Oloo et al. (1997), Vanapalli and Mohamed (2007), Briaud (2013), Vahedifard and Robinson (2016) and Tang et al. (2017) for the determination of the load capacity of a plate resting on a non- saturated. The values ​​obtained in the application of these methods showed values ​​of loads that are quite consistent with the ultimate load determined by extrapolating the curves pressure versus load test pressure. Thus, the results of the influence of the suction on the load capacity of the foundation, being the proposals of equations of verified load capacity for the studied soil.