Comportamento resiliente de um solo de subleito rodoviário submetido à variação de umidade pós-compactação

• Autor(a) principal: Cirolini, Mariana Fantinel
• Data de Publicação: 2025
• Idioma: por
• Título da fonte: Manancial - Repositório Digital da UFSM
• Texto Completo: http://repositorio.ufsm.br/handle/1/36696
• topic: Resiliência Climática; Infraestrutura Rodoviária; Módulo de Resiliência; Deformabilidade; Subleito; Clima Resilience; Road Infrastructure; Resilient Modulus; Deformability; Road Subgrade; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

The occurrence of extreme weather events has been increasing over the years, consequently causing droughts, intense rainfall, fluctuations in average temperatures, among other impacts. Brazil, due to its tropical climate, is particularly susceptible to the effects of climate change. In the context of road infrastructure, the impacts caused by such extreme events are diverse. Earthen materials used in pavement structures are directly affected by these climatic changes. During periods of high rainfall, water infiltrates through the pavement layers until it reaches the subgrade, which is often composed of fine-grained soils that are highly sensitive to moisture variations. Similarly, during drought periods, the water present in the soil evaporates into the atmosphere, altering the moisture content of the pavement layers. Consequently, changes in moisture content—depending on environmental conditions—tend to influence soil behavior, leading to pavement distresses such as fatigue and rutting. Given this premise, there is a pressing need to understand how moisture variation affects the resilient behavior of soils. Therefore, the present study analyzed variations in the resilient behavior of a soil used as subgrade material in the BR-116/RS highway, located in the state of Rio Grande do Sul, Brazil, simulating the different moisture conditions to which it may be subjected. This research evaluated the elastic behavior of six specimens, each subjected to three different moisture conditions: optimum moisture content (Wót), Wót+2%, Wót+1%, Wót–1%, and Wót–2%. Following each conditioning cycle, a resilient modulus test was performed. This approach allowed for the identification of the variations in resilient modulus due to moisture content changes, and for the assessment of the increase or decrease in resilient modulus of the subgrade soil. The findings of this study demonstrated a reduction in resilient modulus when the moisture content exceeded the optimum value, whereas drier conditions resulted in increased stiffness and, consequently, higher resilient modulus values for the studied soil.