The effect of soil mineralogy and pore fluid chemistry on the suction and swelling behavior of soils

Pulat, Hasan Fırat; Yükselen-Aksoy, Yeliz; Egeli, Isfendiyar

doi:10.1007/s10064-013-0499-y

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…During the drying-wetting cycles, the pores of expansive soil can be divided into two types: the pores between agglomerates and the pores inside agglomerates (Pulat et al, 2014). After the first cycle, smaller solid particles form a larger particle (agglomerate) because of flocculation.…”

Section: Microstructure Analysis In Drying-wetting Cyclementioning

confidence: 99%

Swelling Research of Expansive Soil Under Drying-Wetting Cycles: A NMR Method

Wei¹,

Dong²

2020

S&R

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The main purpose of this study is to examine the influence of drying-wetting cycles on the swelling of disturbed expansive soil at the micro-scale. Swelling curve -the relationship between swelling displacement and water-absorbing time -is measured based on specimens that experienced 0-4 drying-wetting cycles. Assisted by Nuclear Magnetic Resonance (NMR), the stage characteristic and mechanism influencing swelling curve are analyzed from a pore-change perspective. Specimens that experienced 1-4 cycles show a higher swelling rate when compared with the specimens without drying-wetting cycles; the swelling rates of each swelling curve are found to decrease with an increasing water-absorbing time. These swelling curves are divided into rapid-swelling stage, slow-swelling stage, and slow-stable stage, where three straight lines are used to fit these stages to each curve. The swelling displacement of the specimen increases after the first cycle, whereas it decreases gradually during the following cycles. Changes of pore structure at each stage are considered to be the main factor affecting the swelling rate during the saturating process. Some fine particles and water-soluble cements are lost after multiple cycles, and some smaller pores are converted into larger pores, resulting in an increase in volume and a decrease of swelling displacement. Moreover, the increase of larger pores and the suction difference after various cycles are important factors leading to the difference of the swelling curve and the swelling displacement.

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Section: Microstructure Analysis In Drying-wetting Cyclementioning

confidence: 99%

Swelling Research of Expansive Soil Under Drying-Wetting Cycles: A NMR Method

Wei¹,

Dong²

2020

S&R

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“…Only few studies account for the effect of minerals on the volume change of reactive soils, with the main focus being on the suction variation and not on the compressibility per se. However, a recent study carried out by Pulat et al [31] suggests that suction is independent of soil mineralogy and cannot be used accurately to predict the volume change of reactive soils.…”

Section: E1mentioning

confidence: 99%

Simulating the behaviour of reactive soils and slab foundations using hydro-mechanical finite element modelling incorporating soil suction and moisture changes

Shams

Shahin

Ismail

2018

Computers and Geotechnics

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The main objective of this paper is to enhance the current design practice of stiffened slab foundations on reactive soils through an advanced numerical modelling study. The paper presents sophisticated three-dimensional (3D) hydro-mechanical finite element (FE) numerical models using coupled flow-deformation and stress analyses capable of simulating the complex behaviour of reactive soils and slab foundations. The decisive parameters of the developed FE models are described in detail and the modelling efficacy is verified through three case studies. The ability of the FE models to simulate the moisture diffusion and suction variations in relation to climate changes is validated through two case studies involving field observations. A third case study involving a hypothetical stiffened slab foundation on reactive soil is used for comparison with one of the traditional design methods. The developed FE models are found to perform well and overcome some of the most significant limitations of available traditional methods, leading to more reliable design outputs.

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“…Clearly, the pore fluid chemistry appears to be critical in the determination of engineering properties and behavior of clayey soils [9,10]; yet, no descriptions of pore fluid chemistry are involved in the current soil classification systems, i.e., USCS, because the alternation of pore fluid chemistry caused by fluid flow in clayey soils prevails in the natural subsurface, and thus clayey soil classification using a certain fluid (i.e., deionized water) may not be appropriate. For example, clayey soils in the mineralogical aspect could be classified as silty soils (i.e., silt or elastic silt in USCS) at a specific pore fluid chemistry, which misinterprets the soil layer for engineering designs.…”

Section: Introductionmentioning

confidence: 99%

Impact of Particle Sizes, Mineralogy and Pore Fluid Chemistry on the Plasticity of Clayey Soils

et al. 2021

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The current classification of clayey soils does not entail information of pore fluid chemistry and particle size less than 75 µm. However, the pore fluid chemistry and particle size (at given mineralogy) are critical in the plasticity of clayey soils because of their impact on negative charge density. Therefore, this study extensively discusses the description of clay with respect to mineralogy, particle sizes, and pore fluid chemistry based on liquid and plastic limits of kaolinite, illite, and bentonite, and estimates undrained shear strength from the observed liquid limits. The liquid limits and undrained shear strength estimated from the observed liquid limits as a function of mineralogy (clay type), particle size, and ionic concentration reveal the need of incorporating pore fluid chemistry and particle size into the fines classification system. Furthermore, multiple linear regression models developed in this study demonstrate the importance of particle size and ionic concentration in predicting the liquid limit of clayey soils. This study also discusses the need for a comprehensive understanding of fines classification for proper interpretation of natural phenomena and engineering applications for fine-grained sediments.

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The effect of soil mineralogy and pore fluid chemistry on the suction and swelling behavior of soils

Cited by 6 publications

References 20 publications

Swelling Research of Expansive Soil Under Drying-Wetting Cycles: A NMR Method

Swelling Research of Expansive Soil Under Drying-Wetting Cycles: A NMR Method

Simulating the behaviour of reactive soils and slab foundations using hydro-mechanical finite element modelling incorporating soil suction and moisture changes

Impact of Particle Sizes, Mineralogy and Pore Fluid Chemistry on the Plasticity of Clayey Soils

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