Análise da deformação permanente de um solo laterítico não saturado com uso da técnica de ensaio em multiestágios

Abstract

The granular layers of the pavement, being close to the surface, are directly influenced by climatic variations, particularly concerning to the soil's moisture content. This aspect is crucial, as the amount of water in the soil's pores significantly impacts its mechanical response. In this context, this study investigated the permanent deformation (PD) of an unsaturated clayey sand soil from the Recôncavo da Bahia region, analyzing the effects of different moisture contents and loading conditions. The research employed the multi-stage PD methodology, which optimizes spent time by reducing the number of specimens required. The studied soil was classified as sandy lateritic (LA'), with low plasticity and good cohesion, making it suitable for pavement applications. Additionally, the results showed that moisture plays a critical role in the soil's mechanical behavior, with PD increasing by up to 131% under moisture conditions above the optimum, while reductions of 80% and 90% were observed with moisture levels 1% and 2% below the optimum, respectively. These findings highlight the soil's high sensitivity to moisture variations, emphasizing the need for rigorous control of this parameter to ensure pavement durability and performance.