Geotechnical Investigations on Highway BR 135 for Earthworks, Asphalt Paving and Special Art Works in Subsection Municipalities Manga-Itacarambi, North of Minas Gerais

摘要

This article presents part of the results and discussions of the geotechnical studies carried out in the area and in materials collected in the BR 135 in the section between the counties of Manga and Itacarambi in the state of Minas Gerais. The study consisted in the execution of field work and laboratory work. In the field investigations were performed (auger, SPT and rotary), collecting material (soil and rock), densities "in situ" and identification/tactile-visual classification of materials. In the laboratory, with soils and rocks collected, were performed additional tests necessary to the design and implementation of the road in question, in that stretch. The studies focused along the existing highway axis and the track side, and side guidance in the predicted contours, concentrated deposits of soil, deposits concentrated of gravel, sands deposits and deposits of rocky material. With implementation of Auger investigations, it was found that the soils tactile-visual characteristics are similar to the predominance of yellow/red sandy soils. It was found that along the highway there are competent rocky material and also friable, mixed, which are not local, but come from deposits in the region and which were used in the primary coating of the road. In the carrying out field work, was done a broad recognition of the BR 135 insertion region that recognition was found that the region is covered by a wide layer of typical sandy soil (Red and Yellow Latosol). In the case of rocky material, it was found that there is a high occurrence of carbonate rocks in the region. This rock is exploited and used as building material, especially on pavements and as aggregates for concrete (Gravel 1,2 and Gravel Gravel powder). Being a characteristic rock materials in the region, it was used for granulometric tests of sand equivalency, organic matter content, form of content, durability, abrasion "Los Angeles" and adhesiveness. The check of sands deposits, local people reported that most of the sand used in the region comes from dredging the San Francisco River in the municipality of Itacarambi. two locations sands were also collected in the municipality of Mango, also the banks of the Sao Francisco River.