Prediction of soil shear strength in agricultural and natural environments of the Brazilian Cerrado

Pesquisa Agropecuária Brasileira

Reginaldo Barboza Da Silva¹  Moacir De Souza Dias Junior¹  Piero Iori¹  Francisca Alcivânia De Melo Silva¹  Sergio Mauro Folle¹  Claudio Alberto Bento Franz¹  Zigomar Menezes De Souza¹ 

关键词: cohesion limits;    machine-ground interaction;    mechanical resistance;    precompression stress;    soil compaction;    soil physical quality.;    limites de coesão;    interação solo-máquina;    resistência mecânica;    pressão de pré-consolidação;    compactação do solo;    qualidade física do solo.;   

DOI  :  10.1590/S0100-204X2015000100009

来源: SciELO

【 摘 要 】

The objective of this work was to develop uni- and multivariate models to predict maximum soil shear strength (τmax) under different normal stresses (σn), water contents (U), and soil managements. The study was carried out in a Rhodic Haplustox under Cerrado (control area) and under no-tillage and conventional tillage systems. Undisturbed soil samples were taken in the 0.00-0.05 m layer and subjected to increasing U and σn, in shear strength tests. The uni- and multivariate models - respectively τmax=10(a+bU) and τmax=10(a+bU+cσn) - were significant in all three soil management systems evaluated and they satisfactorily explain the relationship between U, σn, and τmax. The soil under Cerrado has the highest shear strength (τ) estimated with the univariate model, regardless of the soil water content, whereas the soil under conventional tillage shows the highest values with the multivariate model, which were associated to the lowest water contents at the soil consistency limits in this management system.

【 授权许可】

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