Nonisothermal Models for Soil–Water Retention Curve

Vahedifard, Farshid; Cao, Toan Duc; Thota, Sannith Kumar; Ghazanfari, Ehsan

doi:10.1061/(asce)gt.1943-5606.0001939

Cited by 62 publications

(37 citation statements)

References 49 publications

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“…These could further affect suction stress of the soil under elevated temperatures. The changes in matric suction with temperature are attributed to temperature-induced changes in the surface tension, contact angle and wettability of soil [12][13][14].…”

Section: Resultsmentioning

confidence: 99%

“…To establish a relationship between the matric suction and the degree of saturation, we use the Brooks and Corey SWRC model [18] (referred to as the BC model hereafter), recently extended to temperature-dependent conditions by Vahedifard et al [13][14]. The extended BC SWRC model considers the effect of temperature on capillarity as a function of surface tension, contact angle, and enthalpy of immersion per unit area for unsaturated soils.…”

Section: Temperature-dependent Suction Stress Profile Versus Depth Unmentioning

confidence: 99%

“…Using Darcy's law, one can express the matric suction in terms of depth and hydraulic parameters [19]. A one-dimensional matric suction profile under hydrostatic conditions as a temperature-dependent quantity is expressed as [12][13][14][15]:…”

Section: Temperature-dependent Suction Stress Profile Versus Depth Unmentioning

confidence: 99%

“…Temperature can have a notable impact on hydromechanical response of unsaturated soils [11][12][13], and thus on lateral earth pressures. Elevated temperatures can affect matric suction and degree of saturation, which are the critical parameters controlling the suction stress and, subsequently, the hydro-mechanical behavior of unsaturated slopes and earthen structures [11][12][13]. Therefore, it is prudent to consider the effects of temperatures in lateral earth pressure calculations for applications involving elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The current study aims to develop closed-form models to calculate active and passive earth pressures for unsaturated soils under elevated temperatures. A temperature-dependent model for the suction stress-based effective stress recently developed by Vahedifard et al [13][14] is used, which incorporates two primary temperature-dependent variables of matric suction and effective degree of saturation. The temperature-dependent effective stress is then incorporated into Rankine's classic earth theory to extend it to unsaturated soils subjected to elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Elevated Temperatures on Lateral Earth Pressures in Unsaturated Soils

Thota

Vahedifard

2020

E3S Web Conf.

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Near-surface unsaturated soils can be exposed to elevated temperatures due to soil-atmospheric interactions under drought events, wildfires, heatwaves, and warm spells, or the heat induced by emerging geotechnical and geo-environmental technologies such as geothermal boreholes and thermally active earthen systems. Elevated temperatures can affect the hydro-mechanical characteristics of unsaturated soils, which in turn can alter lateral earth pressures developed in the backfill soil. The main objective of this study is to quantify the effect of elevated temperatures on active and passive earth pressures of unsaturated soils. For this purpose, the paper presents the derivation of an analytical framework to extend Rankine’s earth pressure theory to account for the effect of temperature under hydrostatic conditions. The equations are derived by incorporating the effect of temperature into the soil water retention curve and a suction stress-based effective stress representation. The proposed effective stress equation considers the temperature-induced changes in the contact angle, surface tension, and enthalpy of immersion. To investigate the impact of temperature on active and passive earth pressures, the proposed method is then used in a set of parametric studies to determine active and passive earth pressure profiles for three hypothetical soils of clay, silt, and sand at different temperatures. Results suggest that elevated temperatures can cause variation in active and passive earth pressures for all the soils considered. The findings of this study can contribute toward analyzing earth retaining structures subjected to elevated temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Temperature-dependent Suction Stress Profile Versus Depth Unmentioning

confidence: 99%

Section: Temperature-dependent Suction Stress Profile Versus Depth Unmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Elevated Temperatures on Lateral Earth Pressures in Unsaturated Soils

Thota

Vahedifard

2020

E3S Web Conf.

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Thermo‐hydro‐mechanical modeling of unsaturated soils using isogeometric analysis: Model development and application to strain localization simulation

Shahrokhabadi

Cao

Vahedifard

2019

Num Anal Meth Geomechanics

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SummaryThis study presents a thermo‐hydro‐mechanical (THM) model of unsaturated soils using isogeometric analysis (IGA). The framework employs Bézier extraction to connect IGA to the conventional finite element analysis (FEA), featuring the current study as one of the first attempts to develop an IGA‐FEA framework for solving THM problems in unsaturated soils. IGA offers higher levels of interelement continuity making it an attractive method for solving highly nonlinear problems. The governing equations of linear momentum, mass, and energy balance are coupled based on the averaging procedure within the hybrid mixture theory. The Drucker‐Prager yield surface is used to limit the modified effective stress where the model follows small strain, quasi‐static loading conditions. Temperature dependency of the surface tension is implemented in the soil‐water retention curve. Nonuniform rational B‐splines (NURBS) basis functions are used in the standard Galerkin method and weak formulations of the balance equations. Displacement, capillary pressure, gas pressure, and temperature are four independent quantities that are approximated by NURBS in spatial discretization. The framework is used to simulate strain localization in an undrained dense sand subjected to plane strain biaxial compression under different temperatures and displacement velocities. Results show that an increase in the displacement rate leads to reduction in the equivalent plastic strain while an increase in the temperature leads to an increase in the equivalent plastic strain. The findings suggest that the proposed IGA‐based framework offers a viable alternative for solving THM problems in unsaturated soils.

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An algorithmic framework for computational estimation of soil freezing characteristic curves

Kebria

2022

Num Anal Meth Geomechanics

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Many numerical models for simulating freezing and thawing phenomena of soil have been developed due to emerging geotechnical issues in cold regions. In particular, coupled thermo‐hydro‐mechanical (THM) analysis is used to evaluate complicated deformation, thermal, and moisture transport behavior of freezing–thawing soils. This study proposes a soil‐freezing characteristic curve (SFCC) that is robust and adaptive with various computational frameworks, including the THM approach. The proposed SFCC can also account for different soil types by incorporating the particle size distribution. Here an automatic regression scheme is adopted to update the SFCC associated with deformation and thermal changes. In addition, a smoothing algorithm is adopted to prevent a sharp change of the SFCC due to phase transition between the liquid water and crystal ice. Based on experimental works in the literature, the applicability of our model is demonstrated when the initial water contents and soil particle distribution differ. We further investigate the performance of the proposed SFCC as a constitutive model within a simplified THM framework. Our results show that the proposed model captures the desired behavior of different soil types in the freezing process, such as freezing temperature depreciation, the effect of compaction, and mechanical loading on unfrozen water content.

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Nonisothermal Models for Soil–Water Retention Curve

Cited by 62 publications

References 49 publications

Effect of Elevated Temperatures on Lateral Earth Pressures in Unsaturated Soils

Effect of Elevated Temperatures on Lateral Earth Pressures in Unsaturated Soils

Thermo‐hydro‐mechanical modeling of unsaturated soils using isogeometric analysis: Model development and application to strain localization simulation

An algorithmic framework for computational estimation of soil freezing characteristic curves

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