Assessment of the Behaviour of Field Soils during Compression

Earl, Richard A.

doi:10.1006/jaer.1997.0192

Cited by 20 publications

(12 citation statements)

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“…Nas últimas três décadas, muitas pesquisas têm sido desenvolvidas a respeito do processo de compressão do solo (Earl, 1997). O processo de compressão descreve a compactação (expulsão do ar) e a consolidação (expulsão da água) do solo (Gupta & Allmaras, 1987).…”

Section: Introductionunclassified

Estimativa da capacidade de suporte de carga do solo a partir da avaliação da resistência à penetração

Lima

Silva

Imhoff

et al. 2006

Rev. Bras. Ciênc. Solo

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(5) RESUMOA pressão de preconsolidação, apesar das dificuldades inerentes à sua obtenção, representa uma medida útil do estado mecânico do solo para o seu uso, manejo e planejamento de sistemas de mecanização. A estimativa da pressão de preconsolidação, a partir de propriedades do solo facilmente mensuráveis, é, portanto, uma alternativa que pode ser utilizada para contornar as dificuldades. Os objetivos deste trabalho foram: (a) quantificar a pressão de preconsolidação e a resistência do solo à penetração, em laboratório e em campo, para um Latossolo Vermelho-Amarelo, sob pomar de laranja, e (b) estabelecer a relação entre ambos os indicadores físicos. A amostragem e as avaliações foram realizadas em oito dias consecutivos, acompanhando o secamento natural do solo. Houve relação significativa, positiva e linear entre a pressão de preconsolidação e a resistência do solo à penetração, medida no laboratório e no campo. A similaridade das relações entre resistência à penetração, obtida no campo e em laboratório, e a pressão de preconsolidação permitiu afirmar que a capacidade de suporte de carga pode ser adequadamente estimada a partir da resistência de um Latossolo Vermelho-Amarelo distrófico à penetração medida diretamente no campo.

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Section: Introductionunclassified

Estimativa da capacidade de suporte de carga do solo a partir da avaliação da resistência à penetração

Lima

Silva

Imhoff

et al. 2006

Rev. Bras. Ciênc. Solo

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“…Moreover, it was stated that further generalization of the results obtained so far requires further research especially with reference to various heights of samples. It is justified since the soil compaction resistance in a stiff ring is affected both by the manner of sample deformation (Earl, 1997) as well as sample dimensions (Koolen, 1974). A deformation method is related to the proportion of the plate diameter to the sample diameter (d/D).…”

Section: Introductionmentioning

confidence: 99%

Impact of Plate Diameter and Sample Height on the Determined Pre-Compaction Value

Błażejczak

Dawidowski

2017

Agricultural Engineering

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The objective of the paper was to verify previously obtained results of research on the impact of the plate diameter on the determined value of pre-compaction stress of soil (NG) with a wider selection of dimensions of samples. Tests were carried out on samples with a diameter (D) of 100 mm and heights (H) of 30, 50 or 100 mm produced from the soil material (M) or collected (NNS) from subsoil with the granulation group of: silt loam, loam, sandy loam, sandy clay loam. The following soil properties were determined: granulation type, density of the solid phase, content of humus and calcium carbonate, reaction, plastic and liquid limit. Properties of samples were described with moisture, dry density of solid particles, porosity of aeration, degree of plasticity and saturation. Samples were loaded with plates of varied diameters. The NG value was calculated with the method of searching for the crossing point of tangents with the secondary stress curve and the virgin stresses curve (a traditional method). It was stated that the plate diameter (

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“…displacement) (Earl 1997). The corresponding effect can also be defined by the soil resilience, which is referred to as the soil's capacity to recover its functional and structural integrity, and quantified as the rate or the extent of recovery after external stresses (Seybold et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of the soil in buffer zones under different management practices in Finland

Räty¹,

Horn²,

Rasa³

et al. 2008

AFSci

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Soil structure that favours infiltration is essential for successful functioning of vegetated buffer zones. We measured bulk density, air permeability and precompression stress in a clay soil (Vertic Cambisol) and a sandy loam (Haplic Regosol) in Finland, to identify management-related changes in the physical and mechanical properties in the surface soil of buffer zones. In addition, the impact of texture on these properties was studied at depths down to 180−200 cm. Soil cores (240 cm 3 ) were sampled from a cultivated field, from buffer zones harvested by grazing (only in a clay soil) or by cutting and removing the vegetation, and from buffer zones covered with natural grass vegetation. The samples were equilibrated at a matric potential of -6 kPa and compressed at a normal stress range of 20-400 kPa (7 h), followed by stress removal (1 h). Generally, the clay soil was more compressible than the sandy loam. Due to trampling by cattle, the young grazed buffer zone (0-3 cm) had the largest bulk density and the smallest total porosity. For the grazed sites, reduced air permeability (2.7-5.1 × 10 -5 m s -1 ) was found, compared with that of the buffer zone under natural vegetation (15-22 × 10 -5 m s -1 ), indicating decreased pore continuity. Although the old grazed site was easily compressed, compared with the younger site, it showed a greater resilience capacity due to the protective cover of organic residues accumulated on the soil surface.

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Assessment of the Behaviour of Field Soils during Compression

Cited by 20 publications

References 1 publication

Estimativa da capacidade de suporte de carga do solo a partir da avaliação da resistência à penetração

Estimativa da capacidade de suporte de carga do solo a partir da avaliação da resistência à penetração

Impact of Plate Diameter and Sample Height on the Determined Pre-Compaction Value

Compressive behaviour of the soil in buffer zones under different management practices in Finland

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