Compactação de solos: influência de métodos e de parâmetros de compactação na estrutura dos solos / Soil compaction: influence of compaction methods and compaction parameters in soils structure

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Commonly, compaction of soil specimens in laboratory is processed by dynamic (Proctor test) or static (application of constant tension to the soil) compaction tests, being common to associate similar compaction curves to both procedures. However, data from studies developed in the Civil Engineering Laboratory of the Universidade Federal de Viçosa, Viçosa, Brazil, for road engineering applications brought new inside into this hypothesis and led to this research that addresses the analysis of the influence of compaction modes and compaction parameters in the laboratory compaction curves and in the mechanical strength of two gneiss residual soils from the Zona da Mata Norte of Minas Gerais state, respectively a silty-sandy clay (Soil 1) and a clayey-silty sandy (Soil 2). This research encompassed the following aspects: (i) compaction procedures: static and dynamic compaction modes; (ii) number of specimen layers: one, two and three layers and (iii) diameter of the compaction cylinder: 35 mm, 73 mm and 100 mm. Besides that, evaluation of the influence of compaction modes in the soils specimens structures was based on analysis of data from unconfined compression tests performed in specimens compacted at pre-established water contents (hot, hot - 3% and hot + 2%) using the Standard Proctor compaction effort. Concerning engineering practical applications and based on statistical data analysis (ANOVA) conclusions are as follows: (i) there was significant influence of compaction modes on soils optimum compaction parameters; (ii) there were significant structural changes in the soils specimens due to the application of different compaction modes, as well as it was evident the importance of soils processes formation in theirs mechanical responses; (iii) regarding influence of the number of specimen layers in soil optimum compaction parameters and mechanical strength, it was observed that compaction using two and three layers led to the same results, not being recommended compaction in one layer and (iv) regarding influence of compaction mold diameter in soil optimum compaction parameters and mechanical strength, it was observed significant influence for Soil 1 (more clayey) and not significant influence for Soil 2 (more sandy).

ASSUNTO(S)

análise estatística geotecnica compaction parameters in the laboratory compactação micromorfologia micromorphology statistical analysis tropical soils compaction solos tropicais parâmetros de compactação em laboratório

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