Critical REV Size of Multiphase Flow in Porous Media for Upscaling by Pore-Scale Modeling

Liu, Tong; Wang, Moran

doi:10.1007/s11242-021-01621-2

Cited by 15 publications

(3 citation statements)

References 49 publications

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“…Generally speaking, porous media are multiphase structures, and a reasonable scale should be selected before their description. At present, the description, analysis, and calculation of porous media use the representative elementary volume (REV) expression method [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Rev Description Characterization Methods Of Porousmentioning

confidence: 99%

Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil

2022

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In cold locales, the thermal conductivity of soil porous media varies according to their composition and the phase state of the substance contained within the pore space. During the winter, water and other media in the soil pore space freeze-thaw, resulting in their phase state, composition, distribution, and significant thermal conductivity changes. There are some shortcomings in the current research regarding the thermal conductivity change pattern of unsaturated ice-containing soils. In this paper, the representative elementary volume (REV) selection method is given for unsaturated ice-containing soil with porosity as a representative state variable. Under the condition of freeze-thaw, two thermal conductivity REV analysis models for unsaturated ice-containing soil are established: a simplified volume-weighted average REV model and a fine volume-weighted average REV model; accordingly, a macroscopic thermal conductivity analysis model is given. The computational analysis is carried out with an actual unsaturated ice-containing soil example. The influence of the application of frozen soil in China is examined for its effect on the variation law of the thermal conductivity of porous medium. The variation characteristics of thermal conductivity of permafrost soil with related parameters (porosity, water ratio, moisture percentage, ice content, and tortuosity) are discussed. The model built in this paper provides novel concepts and methods for analyzing the thermal conductivity characteristics of unsaturated soil, as well as enhancing and advancing the analysis.

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Section: Rev Description Characterization Methods Of Porousmentioning

confidence: 99%

Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil

2022

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“…Volume REV Model. Based on Equation (25), the elastic modulus is numerically calculated by fine weighted medial volume REV model.…”

Section: Elastic Modulus Calculation By Fine Weighted Medialmentioning

confidence: 99%

Analysis on Stress-Strain Model of Unsaturated Ice-Containing Soil

et al. 2022

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The relationship between the stress-strain characteristics of ice-containing unsaturated soil and its various physical properties has important implications for the design and construction of transportation and building projects. The study also reveals the varying phases of the substance that can be deposited within the pore space. During winter, the freezing-thawing cycles affect the various media that can be deposited within the soil pore space, such as water and other water. The presence of water and others in the soil’s pores can cause a freeze-thawing phenomenon and a significant change in the material’s elastic modulus. This paper presents a method that uses the representative elementary volume (REV) model to perform a representative state variable analysis on an unsaturated ice-containing soil with porosity. The three stress-strain REV models that were developed for the study were designed to analyze the properties of an unsaturated ice-containing soil under freezing-thawing conditions. Then a comprehensive analysis of the soil’s various components was performed. The effects of frozen soil on the change law of the relationship between different porous medium are studied. The study also explores the effects of the presence of porosity on the variation law of the frozen soil relationship between the stress-strain. The paper presents the study of the variation characteristics of the elastic modulus of permafrost soil. It also explores the various factors (porosity, moisture content, ice percentage, and tortuosity) that influence the stress-strain characteristics of unsaturated soil.

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“…The intrinsic constitutive equations derived from mixture theory are scientifically systematic and rigorous (Guo Z. et al, 2021;Liu and Lai, 2020;Liu et al, 2017;. Hence, it is of good theoretical significance to study and explore the properties of frozen soil based on mixture theory, which has become the theoretical basis for describing the properties of multiphase pore media, including soils (Kefayati et al, 2021;Liu and Wang, 2021;Niu et al, 2022). Among them, Wei (2014) established a theoretical framework for describing the physicochemical properties of unsaturated soils using the composite mixture theory and focused on analyzing the effects of the Donna permeability phenomenon on the suction, effective stress, and chemical potential balance of unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

et al. 2022

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In cold regions, the pore space’s composition and phase state can affect the elastic modulus of the media. During the winter, the freezing conditions in the soil results in the release of water from the pore space, which results in significant changes in the media’s distribution and composition. There are a few weaknesses in the current research with respect to the elastic modulus change example of frozen soil. This paper presents that the Representative Macroscopic Volume (RMV) choice strategy is provided for frozen soil with porosity as a typical condition variable. Under the state of freezing, a “three-box” analytical model for stress-strain calculation of frozen soil porous media is established, namely, the black-box model, the gray-box model, and the white-box model. The relevant equations for calculating elastic modulus are presented based on the proposed “three-box” model and the analysis of the stress conduction process. Results show that the discrepancy between the computed and experimental values of the white-box model is slight, and the elastic modulus of frozen soil calculated by the model established in this paper is consistent with the actual state. It can be deduced that the model established in this paper has practicality and the conclusions of the study are of guiding significance for the application of frozen soil.

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Critical REV Size of Multiphase Flow in Porous Media for Upscaling by Pore-Scale Modeling

Cited by 15 publications

References 49 publications

Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil

Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil

Analysis on Stress-Strain Model of Unsaturated Ice-Containing Soil

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

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