FORMATION OF DIFFERENT TYPES OF ENERGY CONTACTS IN SANDY SOILS IN THE FRAMEWORK OF THE PHYSICOCHEMICAL THEORY OF EFFECTIVE STRESSES
| Autor: | Potapov Ivan Aleksandrovich, Potapov Aleksandr Dmitrievich, Shimenkova Anastasiya Anatolevna |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
morphology of sandy grains
transient (point) contact effective stresses molecular forces physically bound water lcsh:HD9715-9717.5 surface area solvated shell physicochemical theory coagulatory contact energy types of contacts lcsh:Construction industry hydrated shell maximum molecular moisture capacity sandy soils contact phase lcsh:Architecture lcsh:NA1-9428 |
| Zdroj: | Vestnik MGSU, Iss 11, Pp 210-218 (2012) |
| ISSN: | 1997-0935 |
| Popis: | The authors examine the applicability of the physicochemical theory of effective stresses to sandy soils. It is proven that the above theory may be furthered by the argument that all three types of energy contacts, including coagulatory, transient and phase contacts, are present in sandy soils. Coagulatory contact predominates over the other three types of contact. The authors provide their findings in terms of morphological peculiarities attributable to genetic differences of quaternary sands. The authors have completed an experimental research to identify the fixed water content in sands and artificial mixtures that have a sand grain size, and they have also analyzed dimensions of the per-unit surface of samples of natural sands and their fractions to identify correlation between morphological peculiarities of sands and their maximal molecular water-absorbing capacity. The authors have proven the presence of a correlation between the morphology of sand grains and their number in the test sample exposed to the research undertaking, as it determines the number of contacts between particles of sand. The experimental data has proven that the principal provisions of the physicochemical theory of effective stresses are applicable to sandy soils. Natural sands that have particles of different shapes and surface nature demonstrate different types of contacts that prevent compliance of analytical data with the results of experimental researches. Moreover, natural dimensions of coagulatory contact areas of "sandy" systems substantially exceed those identified analytically. Areas of per-unit surfaces of sands that contain particles with highly developed surfaces and clay films exceed those of rounded particles the surfaces of which are smooth and polished as a result of their soft friction in the water. This phenomenon boosts the thickness of adsorbed hydrated or solvated shells. As the influence of physicochemical factors onto effective stresses in sands is not as prominent as in clays, supplementary and more accurate experiments are to be held in respect of separate sand fractions of monogene sands and in respect of samples of natural sands. |
| Databáze: | OpenAIRE |
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