GEOTECHNICAL CHARACTERIZATION AND SOILS CLASSIFICATION FOR FOREST ROADS: CASE STUDY

Abstract

O estudo teve como objetivo realizar a caracteriza\ue7\ue3o geot\ue9cnica e a classifica\ue7\ue3o rodovi\ue1ria para utiliza\ue7\ue3o apropriada de diferentes solos locais como materiais de constru\ue7\ue3o de estradas florestais. O estudo foi realizado em \ue1reas florestais no munic\uedpio de Niquel\ue2ndia, Goi\ue1s, Brasil. Coletaram-se solos finos e granulares predominantes, denominados SL e HA, respectivamente. Os solos foram submetidos a ensaios geot\ue9cnicos apropriados para obras rodovi\ue1rias, identificando os grupos pertencentes de acordo com as metodologias de classifica\ue7\ue3o TRB e MCT. Os resultados demonstram que o solo SL, com fra\ue7\ue3o predominante de areia fina, possui baixa plasticidade e pertence aos grupos A-4(1) e LA\u2019, segundo TRB e MCT, respectivamente. A tens\ue3o suportada alcan\ue7ou 385,10 kPa na maior energia de compacta\ue7\ue3o. A capacidade de suporte foi maior na energia de compacta\ue7\ue3o intermedi\ue1ria. Para o solo granular HA, a fra\ue7\ue3o predominante foi de pedregulho fino e seu enquadramento no grupo TRB foi A-1-b. Segundo a metodologia MCT, o solo SL \ue9 material priorit\ue1rio para base e subleito de estradas. O comportamento esperado para o solo SL \ue9 satisfat\uf3rio como material empregado no subleito, e o HA, excelente, segundo a classifica\ue7\ue3o TRB. A capacidade de suporte dos solos SL e HA indicam que devem ser empregados como refor\ue7o de subleito e base, respectivamente. Em estradas florestais, o solo SL pode ser empregado como subleito e HA como base ou revestimento prim\ue1rio.The study aimed to carry out geotechnical characterization and road classification for proper use of different local soils, as construction materials for forest roads. The study was performed in plantation forest areas in the municipality of Niquel\ue2ndia, Goi\ue1s, Brazil. Predominant fine and course soils have been collected, which were called as SL and HA, respectively. Soil samples were submitted to appropriate geotechnical tests for road infrastructures, identifying the pertaining groups in accordance with the methodologies of TRB and MCT classifications. The results demonstrate that SL soil has predominant fraction of fine sand and low plasticity, classified as A-4(1) and LA\u2019 groups, in according to TRB and MCT classifications, respectively. The supported tension for this soil reached 385.10 kPa on highest energy of compacting. The highest support capacity was reached on intermediate energy of compacting. For HA soil, the predominant fraction was fine gravel and it has fitted into TRB group as A-1-b soil. According to MCT methodology, SL soil is a priority material for base and subgrade of roads. The expected behavior for SL soil was satisfactory as a useful material for subgrade, whereas HA soil was considered as excellent, both in according to TRB classification. The support capacity of SL and HA soils indicates they must be used as reinforcement of subgrade and base, respectively. For forest roads, SL soil is recommended for subgrade and HA for base or primary layer