SAFETY OF BUILDING SYSTEMS. ECOLOGICAL PROBLEMS OF CONSTRUCTION PROJECTS. GEOECOLOGY

FORMATION OF DIFFERENT TYPES OF ENERGY CONTACTS IN SANDY SOILS IN THE FRAMEWORK OF THE PHYSICOCHEMICAL THEORY OF EFFECTIVE STRESSES

Vestnik MGSU 11/2012
  • Potapov Ivan Aleksandrovich - Scientific and Research Institute of Emergency Healthcare named after N.V. Sklifosovskiy engineer, Scientific and Research Institute of Emergency Healthcare named after N.V. Sklifosovskiy, ; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Potapov Aleksandr Dmitrievich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Head, Department of Engineering Geology and Geoecology, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Shimenkova Anastasiya Anatolevna - Moscow State University of Civil Engineering (MGSU) engineer, Department of Engineering Geology and Geoecology, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 210 - 218

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.

DOI: 10.22227/1997-0935.2012.11.210 - 218

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