Use of the Pedological Map in the Geotechnical Characterization of Aris Mestre D’Armas in Planaltina - DF

Abstract

The present work presents the results of the geotechnical studies realized at ARIS Mestre D’Armas in Planaltina, DF, aiming to do a geotechnical characterization of soils and geotechnical risk, using field tests, SPT tests, ring penetrometer probes and sampling probes, permeability tests in drill holes and soil characterization tests in the laboratory. As an auxiliary tool in the spatialization and definition of the tested points of the “Geotechnical Field Investigations” program, through the prediction of local soil characteristics, the pedological and geological maps were used for the incursion of the field teams to the main groups of soils indicated in these maps. Parallel studies were executed in the pedogenetic slopes of the area for the evaluation of toposequence. The overlapping of the geological and pedological maps of the area defined the units with similar geotechnical characteristics. The methodology adopted consists of the evaluation of the characteristics of the soils of the area, based on the interpretation and descriptions contained in the pedological and geological maps; defining a map of unconsolidated material of geotechnical interest, of the area in question. The evaluation includes the superposition of the geological maps and the pedological map, based on methodologies, in which adaptations of geological and pedological classifications are made for geotechnical purposes. Characterization and geotechnical parameters were defined from field and laboratory tests on deformed and undisturbed samples, taken from strategically chosen points, in order to confer a certain representativity of the area under study. A correlation of the soils pedologically defined, with the geotechnical classifications were made by considering the properties, such as: granulometry, mineralogy, Atterberg limits, etc. and use of morphological data such as horizons thickness, macrofactory, color, etc., added to the physical properties of resistance and permeability determined in each profile. The verification of the geotechnical properties of each horizon of interest, through tests was associated to the pedological type, generating the geotechnical map of the area in question.