Estudo da erodibilidade de uma unidade geotécnica no campo de instrução de Santa Maria como base para o seu planejamento ambiental

Abstract

The Campo de Instrução de Santa Maria (CISM), is a naturally fragile area where there are erosion and siltation being usedfor military training with armored and have intensified their use because of the implementation of Centro de Adestramento e Avaliação Sul (CAA-Sul). This study aims to evaluate the erodibility of Geotechnical Unit Formação Santa Maria where construction works of CAA-Sul will take place, providing subsidies for the environmental planning. Besides this it s intended to: understand the use of the field and the erosive processes; evaluate the relief and the Geotechnical Unit of the local where will establish the CAA-SUL and perform the physical characterization and erodibility of this Unit (C horizon), comparing the results obtained by POSSER (2015). The methodological procedures included a review of the researched subject fieldwork to evaluate the physical aspects of the area and collect samples for physical characterization and indirect evaluation of erodibility with disaggregated trials, laboratory cone MCT (NOGAMI e VILIBOR,1979). The PC profile have 3 meters of high with horizons A, sandy-silty, B and B/C, clay-sandy, and C, a conglomeratic sandstone. The C horizon had severe disaggregation and the relation pi/s > 52 (erodible) only for the condition dry on air, being considered high erodibility by the laboratory cone test. The results of erodibility are similar to those obtained by POSSER (2015), in that, except A horizon, are classified as erodible, especially when tested in the condition dry on air, confirming the susceptibility to erosion of the materials/horizons of these profiles, already verified by Maciel Filho (1990). Although it s a special area, the Brazilian army has sought to meet the environmental laws regarding environmental protection and recovery of their areas and this study contributes to the environmental diagnosis of CISM as it relates to erosive processes, providing subsidies for the environmental planning in this area.