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Influence of the moisture and density in the macrostrucural properties of vertisol in three deep levels

Abstract:

In the current research, the influence exerted by the content of moisture and the densification degree of a Vertisoil on the behavior of its macro-structural properties, for three horizons depths were investigated. The soil under study was classified and its physical properties (specific weight, consistency limits, sorting and content of organic matter) as well as its mechanical properties (cohesion, internal angle of friction and the Young's module were determined. In order to accomplish the latter, the test of three-dimensional compressions was used: fast, without consolidating, not drained. A regression multivariate analysis of the existing dependency between the mechanical properties of the soil, the humidity degree and its density were performed. During the analysis of the results a nonlinear relation between the investigated macrostructure properties and the content of moisture in the soil, as well as its state of densification for the first two sampled horizons of depth were shown (0 to 0.15 m and 0.15 to 0.30 m); nevertheless, for the deepest horizon a linear relation (0.30 to 0.50 m) was found. This result could be conditioned by the presence of a lower contain of organic matter. It made evident that the magnitudes and tendencies of the properties under study depend on the water content, density, grain sized composition and content of organic matter of the soil. The tendencies shown by the soil studied for each one of the investigated properties agree with those obtained by other investigators in different types of soils.