Water Retention in Soil1

Groenevelt, P. H.; Bolt, G. H.

doi:10.1097/00010694-197204000-00003

Cited by 93 publications

(62 citation statements)

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“…A thermodynamic proof of Eq. 2, together with a schematic drawing of the e-q-P diagram is presented in Groenevelt and Bolt (1972). Equation 2 is the bridge between the relevant extensive and intensive variables.…”

Section: Theorymentioning

confidence: 99%

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Hydrostatics of frozen soil

Groenevelt¹

2010

Can. J. Soil. Sci.

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Groenevelt, P. H. 2010. Hydrostatics of frozen soil. Can. J. Soil Sci. 90: 403Á408. An outline is presented of the relations between the energy status of water and the content of liquid water and ice in frozen soils. The theory formulates the dependence of the soil moisture characteristic (moisture retention curve) of a frozen soil on the load pressure and the temperature. This formulation requires the definition of the envelope-pressure potentials and the frost potentials of the soil moisture and the ice present in the soil. These potentials are expressed in terms of the void ratio, the moisture ratio, the ice ratio, the moisture ratio equivalent, and the ice ratio equivalent. The relations between these variables are intrinsic properties of the porous medium. They have to be determined by experiment or deduced from indirect measurements. The present theory facilitates such deductions. The measurement of the equilibrium soil moisture and ice pressures in frozen soil is more difficult than the measurement of the volume ratios. Thus, it may be advantageous to deduce the former from the latter. Some data from the literature are used to demonstrate the use of indirect measurements in order to obtain the required properties.Key words: Soil water, soil ice, Maxwell relations, envelope-pressure potentials, frost potentials Groenevelt, P. H. 2010. Hydrostatique des sols gele´s. Can. J. Soil Sci. 90: 403Á408. L'auteur pre´sente un aperc¸u des liens qui existent entre le statut e´nerge´tique de l'eau et la quantite´d'eau et de glace que renferment les sols gele´s. En the´orie, dans un sol gele´, l'humidite´du sol (courbe de re´tention de l'eau) de´pend de la pression sous charge et de la tempe´rature. Pareille formulation exige qu'on de´finisse le potentiel enveloppe-pression et le potentiel de gel de l'eau et de la glace pre´sentes dans le sol. On exprime ces potentiels d'apre`s l'indice des vides, le coefficient d'humidite´, le coefficient de glace, l'e´quivalent du coefficient d'humidite´et l'e´quivalent du coefficient de glace. Les liens entre ces variables constituent des proprie´te´s intrinse`ques du milieu poreux. On doit les e´tablir par l'expe´rience ou les de´duire de mesures indirectes. La the´orie propose´e ici facilite de telles de´ductions. En effet, il est plus ardu de mesurer la teneur en eau du sol a`l'e´quilibre et la pression de la glace dans les sols gele´s que de mesurer leurs rapports volumiques. Il pourrait donc eˆtre plus avantageux de de´duire les premie`res des seconds. L'auteur recourt a`des donne´es publie´es pour illustrer comment les mesures indirectes permettent d'obtenir les proprie´te´s requises.

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Section: Theorymentioning

confidence: 99%

“…Studies regarding non-rigid soils are usually concerned with swelling/shrinking, non-frozen, clay soils (Groenevelt and Bolt 1972;Sposito 1973;Groenevelt and Parlange 1974). The non-rigidity is then observed from the change in bulk density (mass of solids per unit bulk volume) or in void ratio (volume of pore space per unit volume of solid material).…”

mentioning

confidence: 99%

Hydrostatics of frozen soil

Groenevelt¹

2010

Can. J. Soil. Sci.

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“…(13) has the advantage of being applicable for the entire flow region. GROENEVELT and BOLT (1972) as: The conservation of mass (eq. 9) can then be converted into:…”

Section: Mechanica} and Energy Conceptmentioning

confidence: 99%

Modelling soil water dynamics in the unsaturated zone -state of the art

1989

International Journal of Rock Mechanics and Mining Sciences &am

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“…The overburden pressure was assumed to have a negligible effect on the volume change, and such assumptions cre- below shallow water tables [Youngs and Towner, 1970]. Although the load factor was corrected to include the effect of overburden pressure on the volume change as given by (1) [Philip, 1970;Groenevelt and Bolt, 1972], the equilibrium moisture distribution in swelling soils has not been corrected accordingly.…”

Section: Introductionmentioning

confidence: 99%

Gravitational Equilibrium Moisture Profiles in Swelling Soils

Ekanayake¹,

Painter²

1995

Water Resources Research

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Abstract. Extension of the work of Philip (1969aPhilip ( , 1972 has shown that the effect of overburden pressure on volume change of swelling soils produces equilibrium moisture profiles entirely different from those predicted without considering the overburden pressure effects. Volume change of swelling soils accompanied by moisture changes also affects the overburden pressure. The total volume change under an overburden pressure occurs in three different shrinkage phases from saturation to oven dry. These volume change characteristics are usually described on the shrinkage surface, a surface drawn as void ratio e (volume of voids/volume of solids) versus moisture ratio O (volume of water/ volume of solids) for different overburden pressures. A relationship for the moisture gradient is developed by assuming that the overburden potential, a component of the total potential of soil water, is a function of moisture ratio only across a small soil element of a long swelling soil column which consists of large numbers of finite soil elements. The moisture gradient has complex behavior based on the properties of the three shrinkage phases on the shrinkage surface. Distribution of equilibrium moisture paths is then explained by evaluating the moisture gradients at points on an idealized shrinkage surface. It is shown that the soil at great depths could either be saturated or unsaturated at equilibrium. (These depths could be over 250 m for some sodium montmorillonite clays).

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Water Retention in Soil1

Cited by 93 publications

References 0 publications

Hydrostatics of frozen soil

Hydrostatics of frozen soil

Modelling soil water dynamics in the unsaturated zone -state of the art

Gravitational Equilibrium Moisture Profiles in Swelling Soils

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