Results 161 to 170 of about 2,202 (203)

Exploring the correspondence between precompression stress and soil load capacity in soil cores

Soil and Tillage Research, 2017
Abstract The soil precompression stress (σ p ) has been used as an estimator of the soil load bearing capacity, but a few researches have evaluated the correspondence to each other. In this study, we first evaluated in prepared soil cores the time needed for σ p to reach a quasi-stable state. Afterwards, we waited the same time for using another set
André Somavilla, Paulo Ivonir Gubiani, José Miguel Reichert, Dalvan José Reinert, Anderson Luiz Zwirtes   +4 more
openalex   +2 more sources

Determination of precompression stress from uniaxial compression tests

Soil and Tillage Research, 2007
Abstract Soil compaction has been studied for many years due to its implications for crop yield. In addition, precompression stress is important tool in evaluating soil load capacity and its implications for soil structure. This study evaluated whether precompression stress fitted by different methods gave rise to different results when a wide range ...
Karina Maria Vieira Cavalieri-Polizeli, Johan Arvidsson, Álvaro Pires da Silva, Thomas Keller   +3 more
openalex   +2 more sources

Role of compaction and drying-wetting cycles on the capability of precompression stress to indicate load history of heavily disturbed soils

Geoderma, 2021
Abstract Wetting and drying are common processes in agricultural soils, which change particle rearrangement, cementation and related properties. Some recent studies have noted that soil precompression stress (σp) – the soil capacity to support stress – can be affected by wetting and drying cycles and should be seen as state variable instead of a soil
André Somavilla, Alan Carlos Batistão, Dörthe Holthusen, Rafaella Richter Antunes, Paulo Ivonir Gubiani   +4 more
openalex   +2 more sources

Models for prediction of soil precompression stress from readily available soil properties

Geoderma, 2018
Abstract Compaction of the subsoil is an almost irreversible damage to the soil resource. Modern machinery exerts high mechanical stresses to the subsoil, and a range of studies report significant effects on soil functions. There is an urgent need for quantitative knowledge of soil strength in order to evaluate sustainability of current field traffic.
Per Schjønning, Mathieu Lamandé
openalex   +2 more sources

Variance of mechanical precompression stress in graphic estimations using the Casagrande method and derived mathematical models

Soil and Tillage Research, 2009
Abstract Mechanical precompression stress is a yardstick for the strength and compressibility of soils. The default method for the estimation of precompression stress is the graphic method according to Casagrande. It involves a subjective perception by the engineer who not only determines the point of the highest curvature visually, but decides also ...
Jan Rücknagel, Robert Brandhuber, Bodo Hofmann, Matthias Lebert, Karin Marschall, Rainer Paul, Oliver Stock, Olaf Christen   +7 more
openalex   +2 more sources

Soil precompression stress

Soil and Tillage Research, 2004
Johan Arvidsson, Thomas Keller
  +5 more sources

Precompression stress in response to water content and bulk density under no-till Oxisols in southern Brazil

Geoderma Regional, 2020
Abstract This study was designed to measure the variation of precompression stress (σp) with initial bulk density and initial water content and to propose pedo-transfer functions to estimate σp for two Brazilian no-till Oxisols. Undisturbed soil cores were randomly sampled (to obtain an as large as possible variation in bulk density) from two soils ...
Edwardo A. S. Mendonça, Renato Paiva de Lima, Daniel da C. Dantas, Pedro Henrique Dias Batista, Neyde Fabíola Balarezo Giarola, Mário M. Rolim   +5 more
openalex   +2 more sources

Assessing the coupling effects of nanosized fly ash and precompression stress towards mitigating subgrade cracks mobilised by traffic loading

Nanotechnology for Environmental Engineering, 2021
This study is focused on the application of nanotechnology and applied confined pressure to reduce subgrade cracking under traffic loading. At stage one, the expansive subgrade was treated with varying percentages of 0%, 5%, 15%, and 25% of nanosized fly ash (NFA), coupled with confined precompression stresses of 10 kPa and 20 kPa, 12 h after the ...
Aneke Frank Ikechukwu, Mohamed Mostafa Hassan   +1 more
openalex   +2 more sources

Non-linear finite element analysis of cone penetration in layered sandy loam soil – Considering precompression stress state

Journal of Terramechanics, 2009
Abstract Axisymmetric finite element (FE) method was developed to simulate cone penetration process in layered granular soil. The FE was modeled using ABAQUS/Explicit, a commercially available package. Soil was considered as a non-linear elastic plastic material which was modeled using variable elastic parameters of Young’s Modulus and Poisson’s ...
Mehari Z. Tekeste, E. W. Tollner, R. L. Raper, Thomas R. Way, C. E. Johnson   +4 more
openalex   +2 more sources

Soil precompression stress, penetration resistance and crop yields in relation to differently-trafficked, temperate-region sandy loam soils

Soil and Tillage Research, 2016
Abstract Compaction of the subsoil due to heavy traffic in moist and wet soil is widespread in modern agriculture. The objective of this study was to quantify the effects from realistic field traffic on soil penetration resistance and barley crop yield for three Luvisols developed from glacial till.
Per Schjønning, Mathieu Lamandé, Lars Juhl Munkholm, Henning S. Lyngvig, Janne Aa. Nielsen   +4 more
openalex   +3 more sources