Caracterização e avaliação do coeficiente de permeabilidade de um solo residual basáltico de Erechim-RS, compactado nas condições de proctor normal, com percolação de água e óleo diesel

Abstract

The present work had the objective of evaluating the permeability coefficient for water and diesel oil of a basaltic residual soil characteristic of the city of Erechim - RS. For this, permeability tests were performed on compacted soil using the variable load permeability for the test. Another objective of the work was to characterize the soil physically, pointing to the following geotechnical properties: moisture content 27.82%, natural specific gravity of 16.80 kN / m³, specific saturated weight of 18.40 kN / m³, voids of 1.12 and degree of saturation of 68.31%. In addition, the granulometry obtained the following results: clay 70.65%, silt 21.27%, fine sand 6.46%, medium sand 0.79% and coarse sand 0.83%, being classified with a single clay- silty. For the Atterberg limits, the following results were obtained: liquidity limit 58%, plasticity limit 38%, plasticity index 20% and activity index of 0.1, which refers to the activity of soil clay fraction, classifying itself as inactive. The permeability coefficient using water obtained for this soil was 1,11. 10−7m/s at a temperature of 20 ° C, for the diesel oil a permeability of 4,13. 10−8m/s. When comparing the values of this work with those of other authors, it can be observed that in the percolation with water there were no significant variations, on the other hand, in the percolation with diesel oil, they have lower permeability. It is noted that for this soil under these conditions, the normal proctor compaction technique was insufficient to produce a significant improvement in permeability in water percolation, otherwise, for oil percolation, it produced more significant effects on permeability.