Adaptation of the van Genuchten expression to the effects of temperature and density for compacted bentonites

Jacinto, Abel Carlos; Villar, María Victoria; Gómez-Espina, Roberto; Ledesma, Alberto

doi:10.1016/j.clay.2008.04.001

Cited by 92 publications

(36 citation statements)

References 38 publications

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“…Degree of saturation and hydraulic conductivity. In the case of a partially saturated soil, the water degree of saturation depends on suction and other factors including temperature and soil dry density [20,21]. For the scope of this paper, only the influence of suction and temperature on the degree of saturation is considered,…”

Section: Mass Balance Equationsmentioning

confidence: 99%

“…Upon considering the temperature effect on van Genuchten parameters in Eq. (20), the variation in degree of saturation with temperature variation can be evaluated,…”

Section: Mass Balance Equationsmentioning

confidence: 99%

“…In the above solution k i represents the i th root of the character- (25) and (20) to represent the relative permeability curve and soil water retention curve of the soil. Fig.…”

Section: Verification: Uncoupled One Dimensional Infiltrationmentioning

confidence: 99%

“…Usually S l sat ¼ 1:0 and S l res is considered as a fitting parameter in the absence of any laboratory measurements. The formula has three fitting parameters: g a , g n and g m , all of which are temperature dependent as proposed in [20]. To find the parameters, a linear relationship is assumed between surface tension of water r t and the absolute temperature T [20]:…”

Section: Mass Balance Equationsmentioning

confidence: 99%

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A study on how to couple thermo-hydro-mechanical behaviour of unsaturated soils: Physical equations, numerical implementation and examples

Abed

Sołowski

2017

Computers and Geotechnics

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a b s t r a c tThis paper describes a thermo-hydro-mechanical framework suitable for modelling the behaviour of unsaturated soils. In particular, this paper focuses on bentonite clay subjected to a thermo-hydromechanical load, as in the case of nuclear waste engineering barriers. The paper gives a theoretical derivation of the full set of coupled balance equations governing the material behaviour as well as an extended physical interpretation. Finally, a finite element discretisation of the equations and number of simulations verifying their implementation into a custom finite element code is provided. Some aspects of the formulation are also validated against experimental data.

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Section: Mass Balance Equationsmentioning

confidence: 99%

“…Upon considering the temperature effect on van Genuchten parameters in Eq. (20), the variation in degree of saturation with temperature variation can be evaluated,…”

Section: Mass Balance Equationsmentioning

confidence: 99%

“…In the above solution k i represents the i th root of the character- (25) and (20) to represent the relative permeability curve and soil water retention curve of the soil. Fig.…”

Section: Verification: Uncoupled One Dimensional Infiltrationmentioning

confidence: 99%

Section: Mass Balance Equationsmentioning

confidence: 99%

See 2 more Smart Citations

A study on how to couple thermo-hydro-mechanical behaviour of unsaturated soils: Physical equations, numerical implementation and examples

Abed

Sołowski

2017

Computers and Geotechnics

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“…Many previous studies show that the increase of shallow soil temperature influences soil permeability, suction of unsaturated soils, and soils shear strength etc. (Jacinto et al 2009;Tang and Cui 2005). Vertical air temperature prediction therefore plays an important role in the research of issues related to environment, energy sources and engineering (Florides and Kalogirou 2007;Pouloupatis et al 2011;Shi et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of urban heat island intensity under urban–suburban surface and reference site in Kolkata, India

Khan

Chatterjee

2016

Model. Earth Syst. Environ.

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Urban heat island intensity (UHII) in Kolkata has been assessed using simplified numerical model for vertical temperature measurement in tropical monsoon summer month (June, 2015) during pre-onset of monsoon season. The data of 25 field observation sites show that the surface temperature curves are likely to mathematical trapeziums, and surface temperatures are related to vertical air temperatures. Therefore, approximated temperature trapeziums that are determined by high and lower air temperatures can be used to numerical simulation the vertical surface temperature fluctuation or variation. Two different field observation sites respectively in the urban and suburban areas were taken as model purpose. Distinct and good agreement was obtained between numerical simulation and observed temperature. Observed temperatures indicate the mean temperature under urban concrete surface environment is about 3.54°C greater than that of adjacent suburban open surface. The deviation from normal is due to the heat wave environmental effect and different surface thermal effect, which are about 2.08°C and 2.92°C, respectively. Combined with air relative humidity (RH), 'Heat' islands associated with 'Dry' island, which means urban air relative humidity is lower than suburban air relative humidity (79.52 %,). According to the variation of RH and temperature deviation graphs, urban heat island, vertical surface types and rainfall are important factors that influence the air humidity and temperature.

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Characterizing the hydraulic properties of unsaturated sand considering various porosities and drying‐wetting paths of the retention curve

Tan

Chen

et al. 2012

Hydrological Processes

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Previous studies have shown that water retention curve (WRC) and the hydraulic conductivity vary because of changes of the void ratio or porosity of soil. However, limited documents pointed out the change of hydraulic properties of soil when compacted to different porosities while considering both of the drying and wetting processes of the WRC. This information is sometimes necessary for research like finger flow analysis or the occurrence of wetting and drying cycles as what would be seen in the field. Therefore, this study aims to examine the change of WRC characteristics with varied porosity considering both of the drying and wetting path in WRC by conducting a sand box experiment. Results show that the same type of sand compacted to various porosities have different hydraulic parameters. Hydraulic conductivities generally decrease with reduced porosities; shape parameter α of the van Genuchten equation (1980) linearly decreases with declining porosity and shape parameter n in a reversal manner for the sands of interest whether in the drying process or wetting process. The unsaturated properties of sand are further characterized by inspecting the variations of moisture content, matric suction and vertical displacement of soil body subject to periodic changes of the water level by another sand box experiment. The outcomes suggest that the saturated water content and residual water content are changing during the wetting–drying process, which can be an implication of the changed properties of WRC. The characteristics of volumetric deformation might be varied as well because of the observation of the dissimilar patterns of the changing vertical displacements among each wetting–drying process. Infiltration patterns of the sands also are identified through numerical modelling by introducing a constant infiltration flux from the surface followed by a no‐influx condition. Results indicate that less water accumulates in the sand near the surface for the sand compacted to higher porosity, but water can move deeper. Hydraulic conductivity is found as the prime factor dominating the evolvement of wetting fronts. However, shape parameters of water retention curves also affect the infiltration pattern to some extent. In addition, different sands with similar porosities can have quite different infiltrating characteristics. Copyright © 2012 John Wiley & Sons, Ltd.

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Adaptation of the van Genuchten expression to the effects of temperature and density for compacted bentonites

Cited by 92 publications

References 38 publications

A study on how to couple thermo-hydro-mechanical behaviour of unsaturated soils: Physical equations, numerical implementation and examples

A study on how to couple thermo-hydro-mechanical behaviour of unsaturated soils: Physical equations, numerical implementation and examples

Numerical simulation of urban heat island intensity under urban–suburban surface and reference site in Kolkata, India

Characterizing the hydraulic properties of unsaturated sand considering various porosities and drying‐wetting paths of the retention curve

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