<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The objective of the paper was to verify the previously obtained results of research concerning the impact of the plate diameter on the measured value of the pre-compaction stress of silt (<italic>NG</italic>), in conditions of a wider range of soil types and their initial stage. The research was carried out on samples with a diameter of 100 mm and height of 30 mm produced from the soil material <italic>(M)</italic> or collected from the subsoil of the selected soils (AWN) with the granulation type of: silt loam, loam, light loam, sandy-clay soil. The following soils properties were determined: the granulation type, density of the solid phase, content of humus and calcium carbonate, reaction, plastic and liquid limit. The properties of samples were described with moisture, dry density of solid particles, porosity of aeration, degree of plasticity and degree of saturation. The samples were loaded with a testing machine with plates with varied diameters. The value of the pre-compaction stress of soil was measured with the method of searching the crossing point of tangents with the secondary stress curve and the original stresses curve (a classical method). It was found out that for samples <italic>M</italic> with the degree of saturation of 0.40-0.50, the pre-compaction stress does not significantly depend on the plate diameter. For samples <italic>M</italic> or AWN, with the degree of saturation of 0.64-0.82, the pre-compaction stress significantly depends on the diameter of the plate. A conclusion was formulated that in the research of <italic>NG</italic> with the method of uniaxial defonnations, the relation of the diameter of the plate <italic>(d)</italic> to the diameter of the cylinder <italic>(D)</italic> should be within 0.5 ≤ d/D ≤ 0.8.</p></abstract>

The objective of the paper was to verify the previously obtained results of research concerning the impact of the plate diameter on the measured value of the pre-compaction stress of silt (NG), in conditions of a wider range of soil types and their initial stage. The research was carried out on samples with a diameter of 100 mm and height of 30 mm produced from the soil material (M) or collected from the subsoil of the selected soils (AWN) with the granulation type of: silt loam, loam, light loam, sandy-clay soil. The following soils properties were determined: the granulation type, density of the solid phase, content of humus and calcium carbonate, reaction, plastic and liquid limit. The properties of samples were described with moisture, dry density of solid particles, porosity of aeration, degree of plasticity and degree of saturation. The samples were loaded with a testing machine with plates with varied diameters. The value of the pre-compaction stress of soil was measured with the method of searching the crossing point of tangents with the secondary stress curve and the original stresses curve (a classical method). It was found out that for samples M with the degree of saturation of 0.40-0.50, the pre-compaction stress does not significantly depend on the plate diameter. For samples M or AWN, with the degree of saturation of 0.64-0.82, the pre-compaction stress significantly depends on the diameter of the plate. A conclusion was formulated that in the research of NG with the method of uniaxial defonnations, the relation of the diameter of the plate (d) to the diameter of the cylinder (D) should be within 0.5 ≤ d/D ≤ 0.8.

Impact of the Plate Diameter on the Value of the Pre-Compaction Stress in Soils With Varied Textural Group

Department of Construction and Usage of Technical Devices, West Pomeranian University of Technology in Szczecin

Agricultural Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The objective of the paper was to verify the previously obtained results of research concerning the impact of the plate diameter on the measured value of the...

Impact of the Plate Diameter on the Value of the Pre-Compaction Stress in Soils With Varied Textural Group

Published Online: Oct 17, 2016

Page range: 5 - 14

Received: Dec 01, 2015

Accepted: Jan 01, 2016

DOI: https://doi.org/10.1515/agriceng-2016-0039

Keywords
soil, moisture, granulation type, pre-compaction stress, diameter of plate

© 2016 Dariusz Błażejczak et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Impact of the Plate Diameter on the Value of the Pre-Compaction Stress in Soils With Varied Textural Group

Published Online: Oct 17, 2016

Page range: 5 - 14

Received: Dec 01, 2015

Accepted: Jan 01, 2016

DOI: https://doi.org/10.1515/agriceng-2016-0039

Keywordssoil, moisture, granulation type, pre-compaction stress, diameter of plate

© 2016 Dariusz Błażejczak et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
soil, moisture, granulation type, pre-compaction stress, diameter of plate