Avaliação das Flutuacões Sazonais de Umidade e Sucção em um Perfil de Solo Tropical.

• Autor(a) principal: SILVA JÚNIOR, Arlam Carneiro
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000000k27
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/1336
• topic: Solos não saturados; Sucção; Umidade; Atmosfera; Previsão.; 1. Solos não saturados 2. Sucção 3. Umidade 4.Atmosfera 5.Previsão; Unsaturated soils; Suction; Water content; Atmosphere; Forecast.; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA

The evaluation of soil-atmosphere interaction is crucial in several examples of geotechnical works as compaction operations, construction and operation of dams and slope stability. Generally, in these examples, the soils are in unsaturated state. The main objective of this study is to assess and refine the mechanistic approach to predict the changing conditions of suction and moisture of a soil profile unsaturated. Three methods for predicting soil-water characteristic curve were evaluated, and a new method was proposed. The prediction methods, examined in this study, are based on particle size and other index properties. Were considered the soil of the experimental field of Furnas in Aparecida de Goiania (Goiás - Brazil), the soil of the experimental field of the University of Brasilia and soils of temperate climate. Good results were obtained from the prediction methods used. Were monitored for six months, the water content, suction, groundwater and atmospheric conditions of the experimental field of Furnas. The water content was obtained by removal of soil samples and suction was obtained by two measuring methods: filter paper and tensiometer. A device for installation and under the filter paper in the field was developed. The method of the paper filter had good results of total suction and the use of a tensiometer allowed measurements of a limited range of matric suction. Water content and suction predictions were made for the experimental field of Furnas from numerical analysis. It considered soil-water characteristic curves experimental and provided in numerical analysis. It have found most difficult to predict suction and moisture for the shallowest depth analyzed.