An image-based method for quick measurement of the soil shrinkage characteristics curve of soil slurry

Amenuvor, Andrew Cudzo; Li, Guowei; Wu, Jiantao; Hou, Yuzhou; Chen, Wei

doi:10.1016/j.geoderma.2019.114165

Cited by 16 publications

(3 citation statements)

References 24 publications

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“…Two volumetric measurement methods were employed under different conditions: wax coating (WC) with paraffin and digital image analysis (DIA). The former method estimates the volume through water displacement, while the latter estimates the volume from the change in area and height of the samples [8,9]. Additionally, the influence of compaction on soil fabric and structure is explored through the analysis of the PSD.…”

Section: Introductionmentioning

confidence: 99%

Influence of compaction on the soil shrinkage and swelling curves

Encalada¹,

Najdi

Mendes

et al. 2023

E3S Web of Conf.

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The behaviour of soils undergoing deformation due to changes in water content can be described using Soil Shrinkage Curves (SSCs). The SSCs are normally influenced by several factors as the soil’s fabric, different compaction levels, residual void ratio, and the shrinkage limit. In this study, shrinkage curves at different compaction levels were obtained using both wax coating and image analysis as volumetric quantification methods. Both techniques returned consistent results. To fit the obtained experimental data, a single equation is proposed with fitting parameters pertaining to the physical characteristics of the soil samples used. The use of Mercury Intrusion Porosimetry (MIP) is also incorporated to further analyse the structure of the soils being studied. The effect of the drying path on the structure was more apparent in the size range of 100-2000 nm. The effects of compaction on soil structure and shrinkage behaviour were also discussed in the study. The presented work provides valuable insights on the effect of different compaction levels on the soil shrinkage behaviour.

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Section: Introductionmentioning

confidence: 99%

Influence of compaction on the soil shrinkage and swelling curves

Encalada¹,

Najdi

Mendes

et al. 2023

E3S Web of Conf.

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“…In the residual shrinkage zone, air enters intra-aggregate pores, and the decrease in water volume is much more than the decrease in soil volume [19]. Zero shrinkage ranges from the shrinkage limit to the dry endpoint, where the soil volume remains nearly constant despite the water loss [20]. Quite a few models are proposed to fit the soil shrinkage curve and to derive the characteristic points segmenting shrinkage zones easily, including the three straight lines model, XP model, PL model and sigmoid model [18,19,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Impact of Drying–Wetting Cycles on the Shrink–Swell Behavior of Clay Loam in Farmland

Zhang

Huang

et al. 2022

Agriculture

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Soil shrink–swell behavior is a common phenomenon in farmland, which usually alters the process of water and solute migration in soil. In this paper, we report on a phenomenological investigation aimed at exploring the impact of drying–wetting cycles on the shrink–swell behavior of soil in farmland. Samples were prepared using clay loam collected from farmland and subjected to four drying–wetting cycles. The vertical deformation of soil was measured by a vernier caliper, and the horizontal deformation was captured by a digital camera and then calculated via an image processing technique. The results showed that the height, equivalent diameter, volume and shrinkage-swelling potential of the soil decreased with the repeated cycles. Irreversible deformation (shrinkage accumulation) was observed during cycles, suggesting that soil cracks might form owing to previous drying rather than current drying. The vertical shrinkage process consisted of two stages: a declining stage and a residual stage, while the horizontal shrinkage process had one more stage, a constant stage at the initial time of drying. The VG-Peng model fit the soil shrinkage curves very well, and all shrinkage curves had four complete shrinkage zones. Drying–wetting cycles had a substantial impact on the soil shrinkage curves, causing significant changes in the distribution of void ratio and moisture ratio in the four zones. However, the impact weakened as the number of cycles increased because the soil structure became more stable. Vertical shrinkage dominated soil deformation at the early stage of drying owing to the effect of gravity, while nearly isotropic shrinkage occurred after entering residual shrinkage. Our study revealed the irreversible deformation and deformation anisotropy of clay loam collected from farmland during drying–wetting cycles and analyzed the shrink–swell behavior during cycles from both macroscopic and microscopic points of view. The results are expected to improve the understanding of the shrink–swell behavior of clay loam and the development of soil desiccation cracks, which will be benefit research on water and solute migration in farmland.

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“…Typically, most of the published works concerned the laboratory and in situ observation of cracks formed by desiccation [3,[14][15][16]. Due to the limitation of the experimental approaches, various authors added the image processing technique to the experimental work for a better characterization of cracking pattern [10,[17][18][19] for a quick measurement of soil shrinkage characteristic curve. However, these authors focused mainly on factors influencing the process (drying conditions, specimen properties, boundary conditions etc.)…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Desiccation Cracking In Clayey Soil: A New FEM-MPM Coupling Method.

Jihen

Salma

Trabelsi

et al. 2021

Preprint

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Desiccation cracking is a critical phenomenon soliciting the soil hydro-mechanical behavior, and significantly affects the performance of soil in geotechnical engineering. For this reason, an increasing interest toward studying and simulating the soil crack propagation, after a severe exposure to dry conditions (induced by desiccation), has been noticed during the recent years. However, major gaps remain in the previously developed models to properly provide a realistic prediction of the cracks pattern scheme especially when using the classical Finite Element Method (FEM), widely used in the geotechnical application. In this study, owing to the limitation of this method in re-meshing and dealing with large deformation, the authors were prompted to couple FEM with a mesh-free method: The Material Point Method (MPM) to overcome the individual drawbacks of each method. The dominant influencing factors on soil desiccation cracking have been assessed through a desiccation test performed in climatic chamber and using a digital image processing technique (image analysis) for a quantitative description of the studied sample. A model that relates porosity with suction and tensile strength was used to study the effect of the shrinkage phenomena in desiccation term, and to simulate the crack propagation in a thin clayey soil layer using the Code_Bright software. Consequently, a clear and connected crack pattern was observed, the problem of mesh dependency was clearly overcome proving the validity of the approach and providing a further insight into the behavior of clayey soil exposed to desiccation factors.

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An image-based method for quick measurement of the soil shrinkage characteristics curve of soil slurry

Cited by 16 publications

References 24 publications

Influence of compaction on the soil shrinkage and swelling curves

Influence of compaction on the soil shrinkage and swelling curves

Experimental Investigation on the Impact of Drying–Wetting Cycles on the Shrink–Swell Behavior of Clay Loam in Farmland

Numerical Study of Desiccation Cracking In Clayey Soil: A New FEM-MPM Coupling Method.

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