Physicochemical Theory of Effective Stress in Soils by V.I. Osipov

By V.I. Osipov

This e-book provides a brand new thought of potent stresses in soils, which takes into consideration the inner stresses because of the molecular, electrostatic, and structural mechanical forces. those forces exist in skinny hydrate motion pictures of adsorbed water molecules on the contacts of structural parts, generating the so-called disjoining impression. they are often evaluated via incorporating theoretical achievements of molecular physics and colloidal chemistry. the unconventional thought defined during this publication considers not just exterior but additionally inner stresses and provides assorted effects for powerful forces in comparison with the Terzaghi thought generally utilized in soil mechanics. The publication presents equations for the particular powerful stresses on the contacts of debris, hence bettering the Terzaghi concept in physicochemical context.

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Physicochemical Theory of Effective Stress in Soils

This ebook offers a brand new thought of powerful stresses in soils, which takes into consideration the inner stresses as a result of the molecular, electrostatic, and structural mechanical forces. those forces exist in skinny hydrate motion pictures of adsorbed water molecules on the contacts of structural components, generating the so-called disjoining impact.

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Isolation of disjoining pressure produced by the structural component Пs in the total disjoining effect is associated with certain difficulties due to an inadequate level of theoretical knowledge in this area. Hence, experimental data are used for quantitative estimates of the structural component. 37). 48) where z is the charge of counterions, e is the electron charge, kT is the energy of thermal motion of ions, æ is the parameter characterizing the thickness of the EDL ion atmosphere (δ = 1/æ), h is the gap size between particles, n0 is the concentration of ions in the gap, and A* is the complex Hamaker constant.

Unlike α-film, the disjoining effect and stability of β-film are not controlled by any specific mechanical properties of the film itself. Its thickness is determined by the forces of ionic-electrostatic repulsion of surface diffusion layers and is controlled by the disjoining effect of these forces. Temperature rise to 65 °C does not cause any structural effects and the β-film thickness remains almost the same. When the β-film thickness is <60 nm, it raptures. Thinning and destruction of β-film depends on the electrolyte concentration in the solution.

ZhETF 21(8):1755–1770 (in Russian) Deryaguin BV, Churaev NV (1972) The isotherm of disjoining pressure of water films on quartz surface. Dokl AN USSR 207(3):572–575 (in Russian) Deryaguin BV, Churaev NV (1984) Wetting films. Nauka, Moscow (in Russian) Deryaguin BV, Kusakov MM (1936) Properties of thin liquid layers. Izv AN USSR Ser Chem 5:741–753 (in Russian) Deryaguin BV, Landau LD (1941) Theory of the stability of strongly charged lyophobic soils. Acta Phys Chem USSR 14(6):633–662 Deryaguin BV, Titievskaya AS (1953) Disjoining pressure of free liquid films.

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