Classificação e determinação da permeabilidade de solos oriundos do município de Alegrete/RS

Abstract

The great diversity of soil types that can be found, demonstrate the need to know the physical characteristics of material, previously to their use. As the Unified Soil Classification System (USCS) and the transportation Research Board (TRB), considered as traditional, present limitations when employed for the classification of tropical soils, like those found in Brazil, was developed the MCT Methodology. But when the problem involves the water percolation, it’s also necessary the know of material permeability. This work aims present the classification of three soil samples from the municipality of Alegrete/RS, using the USCS and TRB systems, the MCT Methodology, in addition to evaluating the soils permeability. The laboratory tests were performed with deformed soil samples. For the classification of each material according to the USCS and TRB systems have been performed laboratory tests of consistency limits and determination of size distribution, by sieving and sedimentation. For the classification according the MCT Methodology needed perform the Mini-MCV compaction test and the loss of mass by immersion test. Already for the permeability test, were shaped test bodies and has obtained permeability coefficient of each sample. The Campo, Rodovia and Caverá soils, received designation of clay of low plasticity (CL), clayey sand (SC) and clayey sand (SC) according to the USCS, were allocated to the group A-4 (silty soils) of the system TRB, already the MCT Methodology classified soils as lateritic sandy soil (LA’), lateritic clayey soil (LG’) and lateritic clayey soil (LG’), while the permeability coefficient denoted to soil behavior of clay, respectively. The classifications found through USCS and TRB systems and the MCT Methodology have correlation, as well as the permeability coefficient calculated for the soils is compatible with data found in literature. According to the MCT Methodology, LA’ soil has an excellent performance where applied for constructive purposes.