Erosion of the frozen riversides of the northern rivers depending on the direction of the coastal slope

Vestnik MGSU 9/2018 Volume 13
  • Debolsky Vladimir K. - Water problem institute of RAS Head of laboratory of the dynamics of channel flows and ice heat, Water problem institute of RAS, 3 Goubkina st., Moscow, 119333, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Gritsuk Iliya I. - Water problem institute of RAS Candidate of Technical Sciences, Senior Researcher, assistant professor, Water Problems Institute of RAS (WPI RAS), Water problem institute of RAS, 3 Goubkina st., Moscow, 119333, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ionov Dmitry N. - Peoples’ Friendship University of Russia (RUDN University) Candidate of Technical Sciences, junior researcher, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya st., Moscow, 117198, Russian Federation.
  • Maslikova Oksana J. - Water problem institute of RAS Candidate of Technical Sciences, Water problem institute of RAS, 3 Goubkina st., Moscow, 119333, Russian Federation.

Pages 1112-1124

The problems of hydraulic engineering require expansion of the scale of research on destructive coastal processes of water bodies located on the territory of the permafrost. Subject: of research in this article are the slopes of the rivers located in the zone of frozen rocks, and the main possible processes on them, occurring under the influence of various seasonal factors. The aim of this work is to study the thermo erosion slope processes of permafrost with allowance for hydromechanical and thermodynamic factors and the development of the main characteristics of these processes, as well as the construction of a single model that allows estimating and predicting the effect of seasonal conditions (including spring snowmelt and exposure to solar radiation) on possible destructive coastal processes at water bodies located on the territory of the permafrost zone. Materials and methods: theoretical analysis and generalization of known achievements in the field of hydrology and glaciology, the theory of slope processes, sediment transport, mechanics of frozen soils, and filtration. As a factual material, the data of laboratory experiments carried out in the PFUR hydraulic laboratory on a facility that allows varying rain currents of varying intensity, while measuring both the rate and number of infiltration flows, and the amount of side flow in the case of frozen or partially thawed soil, that were used as factual material. A various soil structure was modeled by freezing or introducing ice interlayers. Such studies in the laboratory were conducted for the first time. Results and conclusions: a method for predicting thermo-erosion is proposed taking into account the effect of seasonal conditions on permafrost. The influence of the direction of the coastal incline on the rate of thawing of soils under the influence of solar radiation is studied. The influence of ultraviolet rays on snow melting is different from the influence of infrared rays, since short waves (UV) penetrate deep into opaque substances and are transformed into heat fluxes within the snow layer. Cloudiness is a deterrent only for the IR portion of the spectrum. It has been shown experimentally that the dependence of the erosion of solid matter on the slope angle (other things being equal) will have a exponent (4/3) form. Thawing and erosion of frozen water bodies are proportional to the square root of time. The linear coefficient depends on the nature of the rock, ice content, ambient temperature and flow temperature. On the basis of the results obtained, it is possible to give practical recommendations for preventing and reducing the negative impact of the destructive processes under investigation, which is especially important for those areas where intensive hydrotechnical construction is being carried out.

DOI: 10.22227/1997-0935.2018.9.1112-1124

Download

Principles of classification of soilmasses for construction purposes

Vestnik MGSU 9/2013
  • Chernyshev Sergey Nikolaevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Geologo-Mineralogical Sciences, Professor, Department of Engineering Geology and Geoecology, Moscow State University of Civil Engineering (National Research University) (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 41-46

The author proposes original grounds for the classification of the full range of soil masses as a supplement to the classification of soils provided in GOST 25100—2011. The author proposes four classes of soil masses, each class having several types and sub-types of soils. The classification will improve the accuracy of engineering and geological surveys and computer models of the geological environment developed for the purpose of design of buildings and structures. The author offers a classification of soils to identify the geological environment comprising one or more types of soil which are genetically and structurally distinct. Any soil mass type differs by its origin, and, as a consequence, its internal geological structure, stress-strain state and inherent geological processes. Any genetically isolated type of soils a specific program of research, both in terms of methods and in terms of density testing in the point of sampling. The behavior of rock masses together with the engineering structure is pre-determined by the properties of the rock, its relative position (geological structure), a network of cracks and other weakening factors, and the natural state of stress. The fracture network is of paramount importance. Cracks are characterized by direction, length, width, surface roughness of walls, and a distance between parallel cracks.

DOI: 10.22227/1997-0935.2013.9.41-46

References
  1. Pashkin E.M., Kagan A.A., Krivonogova N.F.; Pashkina E.M., editor. Terminologicheskiy spravochnik po inzhenernoy geologii [Reference Book of Terms of Engineering Geology]. Moscow, KDU Publ., 2011, 952 p.
  2. Panyukov P.N. Inzhenernaya geologiya [Engineering Geology]. Moscow, Gosgortekhizdat Publ., 1962.
  3. Bondarik G.K. Teoriya geologicheskogo polya [Geological Field Theory]. Moscow, MIMS Publ., 2002, 129 p.
  4. Belyi L.D. Obshie principial'nye polozheniya [General Principal Provisions]. In the book: Geologiya i plotiny [Geology and Dams]. Moscow — Leningrad, Gosenergoizdat Publ., 1959, pp. 9—19.
  5. Muller L. Der Felsbau. Ferdinand Enke Verlag. Stuttgart, 1963, 453 p.
  6. Bauduin C.M. Determination of Characteristic Values. In: U. Smoltczyk, editor, Geotechnical Engineering Handbook. Berlin, Ernst Publ., 2002, vol. I, pp. 17—50.
  7. Frank R., Kovarik J.B. Comparasion des niveaux de modele pour la resistance ultime des pieux sous charges axiales. Revue Francaise de Geotechnique. 2005, 110, pp. 12—25.
  8. Belyi L.D. Osnovy teorii inzhenerno-geologicheskogo kartirovaniya [Fundamentals of the Theory of Engineering Geological Mapping]. Moscow, Nauka Publ., 1964.

Download

Results 1 - 2 of 2