Finite element simulation of soil failure patterns under soil bin and field testing conditions

Tagar, A. A.; Changying, Ji; Adamowski, Jan; Malard, Julien; Qi, Chen Shi; Ding, Qishuo; Abbasi, Naeem Akhtar

doi:10.1016/j.still.2014.09.006

Cited by 63 publications

(30 citation statements)

References 46 publications

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“…However these related recommendations have not yet been evaluated in actual field conditions. Soil bin studies were justified with better control of soil physical parameters and machine operating variables, as well as the possibility for repeated tests over short periods without weather constraints [19] . The soil used in a soil bin is structureless due to the frequent disturbance by tillage and compaction between tests for soil preparation [20] .…”

Section: Introductionmentioning

confidence: 99%

Field experimental study on optimal design of the rotary strip-till tools applied in rice-wheat rotation cropping system

Yang

Fielke

Ding

et al. 2018

International Journal of Agricultural and Biological Engineering

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Abstract:The rice-wheat rotation system plays a significant role in Asian agriculture. The introduction of strip-tillage into the rice-wheat system for wheat planting offers a way to use conservation tillage practices to improve the seedbed quality, retain residue between rows and reduce energy input. A field experiment was conducted using an in-situ test rig. Three types of blade (bent C, straight and hoe) were evaluated in four tool configurations at four rotary speeds (180 r/min, 280 r/min, 380 r/min and 510 r/min) in a paddy soil. Furrow shape parameters, tillage-induced soil structures and energy consumption were assessed. Results showed that the straight blade configuration failed to create a continuous furrow at either 180 r/min or 510 r/min. The bent C blade configuration produced a uniform furrow profile but its furrow backfill was poor and unsuitable for seeding. The hoe blade configuration cut a continuous furrow and better tillage-induced soil structure, but it produced a much wider and non-uniform furrow shape. The mixed blade configuration (central hoe blades with two straight blades aside) provided a uniform furrow with good backfill and fine tilth by utilizing both the cutting effect of straight blades on the furrow boundaries and tensile fracturing of the furrow soil by the hoe blades. The torque of the mixed blade configuration was comparable with the bent C blade but was less than the hoe blades. Hence, a mixed blade configuration was recommended for rotary strip-tillage seeding using in rice-wheat system. Keywords: strip tillage, rotary strip-till tool, blade configuration, furrow quality, tilth, torque, rice-wheat rotation system DOI: 10.25165/j.ijabe.20181102.3347Citation: Yang Y S, Fielke J, Ding Q S, He R Y. Field experimental study on optimal design of the rotary strip-till tools applied in rice-wheat rotation cropping system. Int J Agric & Biol Eng, 2018; 11(2): 88-94.

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Section: Introductionmentioning

confidence: 99%

Field experimental study on optimal design of the rotary strip-till tools applied in rice-wheat rotation cropping system

Yang

Fielke

Ding

et al. 2018

International Journal of Agricultural and Biological Engineering

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“…For two-way vertical drainage, the time t during the stabilized soil's primary consolidation in relation to cv, H and Tv can be expressed in Equation 30.…”

Section: Methodsmentioning

confidence: 99%

“…The finite element method is the numerical method employed by PLAXIS 2D 8.2 Professional version software to develop numerical solution to the problem. Finite element modelling (FEM) of soil physical behavior can provide information which is difficult or impossible to obtain experimentally [30]. The basic idea in the finite element method is to find the solution of a complicated problem by replacing it by a simpler one [31].…”

Section: Methodsmentioning

confidence: 99%

“…The method determines cv by comparing the stabilized soil compression as a function of square root of time from both experimental and numerical curves to U as a function of Tv from square root of time theoretical curve. Based on the assumption that the hydrodynamic process dominates up to 90% primary consolidation, the method determines cv of the stabilized soil by substituting Tv as 0.848 from the square root of time theoretical curve and the time to reach 90 % of primary consolidation from experimental square root of time-compression curve into Equation 30. The values of cv were then compared to those predicted from numerical square root of time-compression curve, which was developed from the finite element software.…”

Section: Finite Element Model Validationmentioning

confidence: 99%

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Analytical and Numerical Modelling of One-Dimensional Consolidation of Stabilized Peat

Wong

Somanathan

2019

Civ Eng J

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The objective of the paper is to compare and evaluate analytical and numerical solutions of one-dimensional consolidation of stabilized peat. The type of analytical method used to solve the problem is exact method by separation of variables and utilization of Fourier series. Plaxis 2D 8.2 Professional version software was used to find numerical solution to the problem by employing the finite element method. One-dimensional consolidation problem of stabilized peat was solved numerically and validated with the one solved analytically based on laboratory experimental results. From the results, it was discovered that the consolidation characteristics of stabilized peat evaluated numerically were found to have close approximation to those evaluated analytically. There is a novel value in developing an accurate numerical prediction for the vertical consolidation of stabilized peat considering the complexity of the soil treatment method. It must be noted that peat is highly problematic because it is produced from plant decomposition with extremely high organic matter. 399 for 7 days before testing. It is notable that oedometer consolidation apparatus is sufficient for testing the stabilized soil due to the fact that the soil was homogeneously mixed with the binding admixtures and silica sand. As such, it could be reliably used to simulate the one-dimensional deformation and drainage characteristics of the stabilized soil as the soil dissipation of excess pore water pressure became less significant over time due to the cementation process in the stabilized soil. Furthermore, the equipment set up for oedometer testing is simple and not time consuming as compared to that of a more advanced equipment such as Rowe consolidometer. The complexity of Rowe consolidometer setup is evident in the published work of Baral et al. [18] which is about the study of radial consolidation characteristics of soft clay based on large specimens. To develop a proper understanding and to ensure the reliability of the test results, it would be helpful to back analyze and validate the experimental results based on the analytical equation with the ones developed from numerical solution using Plaxis 2D 8.2 Professional version software. As such, the paper is concentrated at evaluating the results of one-dimensional consolidation tests from standard oedometer consolidation apparatus, which were determined based on the idealization of analytical model and later, validating the results using the finite element software.

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“…However, these studies have in common many soils, moisture contents, textures, and different conditions in soil physical properties, which makes it hard to define the parameters of the compression curve for a specific study and more accurate analysis. Under these conditions, simulations can help create scenarios for reproducing experimental data (Tagar et al, 2015), which formalize and analyze some error propagation methods for modeling; among them, the Monte Carlo method has general applicability and can be used in models with mathematical formulations (Ortiz et al, 2004). This procedure was used by Ortiz et al (2004), and simulations based on other methods were used by Oliveira et al (2013Oliveira et al ( , 2014 for soil data in Brazil.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Methods for Determining Precompression Stress Based on Computational Simulation

Silva

Lima

2016

Rev. Bras. Ciênc. Solo

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There are many methods for determining precompression stress (σ p ), whose value is affected by the slope of the soil compression curve. This study was designed to evaluate the hypothesis that for a certain compression curve all methods used to determine σ p present the same value and accuracy. The aim of this study was to compare the accuracy and the relationship among seven of these methods by computational simulation of soil compression curves under nine scenarios. The following methods were used: Casagrande, Pacheco Silva, intersection of the initial void ratio with the virgin compression line (VCLzero), and the regression methods based on 2 (reg1), 3 (reg2), 4 (reg3), and 5 (reg4) points for modeling the elastic curve. Under each scenario, created by combining the swelling and the compression indices, 1,000 compression curves were computationally simulated via the Monte Carlo method. Subsequently, 95 % percentile confidence intervals were built using the 1,000 estimates of σ p from each method under each scenario. Most of the differences among the methods were detected under scenarios consisting of high swelling and low compression indices. In general, Casagrande, Pacheco Silva, and reg4 were strongly correlated and presented the highest values of σ p , as well as similar variability. The latter two can be considered as alternatives to the standard method of Casagrande, except for Pacheco Silva when the curve has a low compression index (≤0.2) and from medium to high swelling index (≥0.025), for which differences (p<0.05) were detected.

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Finite element simulation of soil failure patterns under soil bin and field testing conditions

Cited by 63 publications

References 46 publications

Field experimental study on optimal design of the rotary strip-till tools applied in rice-wheat rotation cropping system

Field experimental study on optimal design of the rotary strip-till tools applied in rice-wheat rotation cropping system

Analytical and Numerical Modelling of One-Dimensional Consolidation of Stabilized Peat

Comparison of Methods for Determining Precompression Stress Based on Computational Simulation

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