Hydromechanical behavior of unsaturated soil with different initial densities over a wide suction range

Gao, You; Sun, Deqing; Zhu, Zhanyuan; Xu, Yongfu

doi:10.1007/s11440-018-0662-5

Cited by 85 publications

(18 citation statements)

References 34 publications

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“…In the drying experiment, the saturated samples were placed in airtight glass containers containing saturated salt solutions. The salts used and the corresponding potentials are presented in Table 2 (Gao et al, 2019; Greenspan, 1977). During the drying test, the specimens were left to equilibrate in an airtight glass container for 4–8 weeks before equilibrium water content was measured.…”

Section: Methodsmentioning

confidence: 99%

Characterization and Quantification of Pore Water in Clays During Drying Process With Low‐Field NMR

Tian

Wei

2020

Water Resources Research

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Water transport in large-specific surface soil is controlled by soil microstructure and soil-water interaction. In this paper, soil-water interaction and confined water dynamics as well as soil microstructure are studied by combining the nuclear magnetic resonance technique and the mercury intrusion porosimetry. It is revealed that during a drying process pore water drainage occurs sequentially from larger pores to smaller pores, and surface interaction parameter ρ 1 appears to be a well-defined quantity at a water content above one water layer, below which ρ 1 shows a different trend. With the two-dimensional T 1-T 2 correlation measurements, surface dynamical parameters, including residence time and surface affinity coefficient, are determined, showing that the mobility of pore water decreases gradually with the decrease in water potential. The effect of temperature on the soil-water interaction is discussed via the variation of relaxation time with temperature. The increase in residence time and surface affinity coefficient as well as effective activation energy ΔE indicates that the mobility of pore water decreases with the decrease in water potential. In addition, the positiveness of ΔE indicates that unsaturated hydraulic conductivity of clay increases with temperature, and a larger ΔE implies that the unsaturated hydraulic conductivity for the sample equilibrated at smaller potential is more sensitive to the temperature. The average pore sizes of the saturated samples are also determined by the mercury intrusion porosimetry, showing clear consistency between the mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) measurements.

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Section: Methodsmentioning

confidence: 99%

Characterization and Quantification of Pore Water in Clays During Drying Process With Low‐Field NMR

Tian

Wei

2020

Water Resources Research

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“…Previous experimental evidences (e.g., [3,[7][8][9]) have shown that the complicated pore structure of clayey soils can be bimodal and even multimodal. For instance, Romero et al [3] observed two distinct sub porosities in the statically compacted Boom-Clay, i.e., the inter- [8] identified four pore families in bentonite MX80 during hydration.…”

Section: Direct Transformation Of Psd To Swccmentioning

confidence: 99%

A simple approach for predicting soil water characteristic curve of clayey soils using pore size distribution data

2021

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The soil water characteristic curve (SWCC) of soils can be derived from the measured pore size distribution (PSD) data by applying capillary models. This method is limited for clayey soils due to the PSD changes during SWCC testing. In this study, a suction-dependent multimodal PSD model based on probability theory is developed and used to derive SWCC. The model is validated by simulating the drying branches of SWCCs of four compacted Lias Clay samples with different initial states. A good consistency between the measured and predicted SWCC is shown.

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“…According to the consolidation theory by Fredlund et al 4 and the proposed consolidation modeling, basic assumptions are listed as follows: The foundation is homogeneous; Solid particles and water phase are incompressible; Air and water phases can only flow along the radial direction; The air and water phases are continuous and independent; Permeability coefficients related to air and water phases are constant. Actually, assumption (5) may not be universal under all circumstances, for permeability coefficients are related to saturation, void ratio, and water content during the consolidation process 47 . However, it is reasonable to suppose that the permeability coefficients are invariant for a small strain increment in the transitory process, and only in this way, the influencing characteristics on unsaturated soils can be determined under different factors 4,15,35,36 …”

Section: Mathematical Modelingmentioning

confidence: 99%

Analytical solutions for the consolidation of unsaturated foundation with prefabricated vertical drain

Huang

et al. 2020

Num Anal Meth Geomechanics

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Summary Based on the consolidation theory raised by Fredlund, the solutions for the equal‐strain consolidation of unsaturated foundation with the prefabricated vertical drain considering smear effect and drain resistance are analytically formulated in this paper. Firstly, governing equations for excess pore pressures (i.e., excess pore‐air and pore‐water pressures) under the equal‐strain hypothesis are derived with the introduction of radial boundary conditions. Afterwards, the obtained coupled equations are solved by applying general integration, decoupling process, and Fourier sine series expansion. The smear coefficients and factors of drain resistance corresponding to air and water phases are both captured explicitly in the final solutions. Furthermore, the degenerated solutions are employed to verify the reliability of the current solutions. Finally, a parametric study is conducted to study the consolidation characteristics of the proposed foundation model against modeling sizes (S and N), smear coefficients (αa and αw), and drain resistance factors (Ga and Gw).

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Hydromechanical behavior of unsaturated soil with different initial densities over a wide suction range

Cited by 85 publications

References 34 publications

Characterization and Quantification of Pore Water in Clays During Drying Process With Low‐Field NMR

Characterization and Quantification of Pore Water in Clays During Drying Process With Low‐Field NMR

A simple approach for predicting soil water characteristic curve of clayey soils using pore size distribution data

Analytical solutions for the consolidation of unsaturated foundation with prefabricated vertical drain

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