Details

Autor(en) / Beteiligte

• Fedotov, G. N.
• Shoba, S. A.
• Ushkova, D. A.
• Potapov, D. I.
• Gorepekin, I. V.

Titel

Effect of Soil Gels on Hysteresis Phenomena in Soils

Ist Teil von

• Doklady earth sciences, 2023-10, Vol.512 (2), p.1055-1058

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2023

Quelle

SpringerLink

Beschreibungen/Notizen

• Based on an analysis of the presumed mechanisms of the hysteresis of the water retention curve (WRC) for soil drying and wetting, as well as the ideas about the nanostructural organization of soils, a conclusion is made that the hysteresis can be caused either by stable (non-colloidal particles) or labile (gels) parts of the solid phase in soils. Due to the fact that until recently the main attention has been focused on study of the effect of the stable solid phase of soils on the hysteresis of the WRC, it is proposed to investigate the effect of soil gels on hysteresis. For this purpose, the effect of the moisture content of soil samples prepared by drying and wetting on the initial viscosity of soil pastes is studied. It has been established that a well-defined hysteresis is observed for the samples of all soil types studied. To explain the hysteresis, two mechanisms based on changes in soil gels in the wetting–drying processes are proposed. One of them is based on the slowness of swelling and shrinkage of soil gels when they absorb and release water. The second is based on the greater hydrophobicity of the surface of gels containing less water, and water slippage on hydrophobic areas of the surface with a decrease in the viscosity of pastes. Thus, the studies conducted have shown that hysteresis phenomena in soils are caused by soil gels and their changes during drying and wetting of soils.