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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

VELOCITY OF VISCID FLOW LANDSLIDES IN THE EVENT OF A PILE CURTAIN AND A CONTINUOUS RETAINING WALL

Vestnik MGSU 3/2012
  • Buslov Anatoliy Semenovich - Gersevanov Research Institute of Bases and Underground Structures (NIIOSP) Doctor of Technical Science, Professor, Advisor Russian Academy of Architecture and Construction Sciences, chief research worker, Gersevanov Research Institute of Bases and Underground Structures (NIIOSP), 59 Ryazanskiy pr-t, Moscow, 109428, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kalacheva Elena Nikolaevna - Ryazanskiy Branch, Moscow State Open University named after V.S. Chernomyrdin , Ryazanskiy Branch, Moscow State Open University named after V.S. Chernomyrdin, 2a Kolhoznaya St., 390046, Ryazan, Russian Federation.

Pages 16 - 24

In regions of intensive precipitation, slopes tend to become viscid due to accumulated moisture. The ultimate resistance of soils susceptible to landslides is equal to zero, while shear stresses between layers are proportional to the velocity gradient.
To prevent landslides, slope soil is stabilized by a continuous retaining wall or a row of sparsely erected piles. The effectiveness of these methods is measured by the diminishing rate of the sliding speed at the landslide-prone slope. Due to the non-linear nature of the viscid flow, the Navier - Stokes equations cannot be applied.
To perform a more precise calculation, the entire flow is broken down into segments in respect of which the analysis of the viscid flow can be performed; individual results are consolidated on the basis of a common parameter.
The first flow section, located at a substantial distance from the buttresses, can be considered as a steady stream of plane gravitational motion alongside the slope. In the second section, the slide is obstructed by the buttress and the parallel flow pattern is formed. There occurs a split of the flow at the critical point of entry, located on the front surface of a solid wall or a buttress.
The third section, which can be compared with the flow of viscid fluid in a canal, is typical for buttresses that have a significant length in the direction of the landslide flow.
The papers hows that the common parameter applicable both to solid and dispersed barriers is the controlled volume of the fluid flow at the point of entry to the pre-boundary area.
As a result of application of the proposed methodology, equations were obtained that made it possible to calculate the speed of the viscid slide depending on different types of piles. The paper describes the conditions that make the viscid mass climb over the constructed barrier.

DOI: 10.22227/1997-0935.2012.3.16 - 24

References
  1. Lojcjanskij L.G. Mekhanika zhidkosti i gaza [Liquid and Gas Mechanics]. DROFA Publ., Moscow, 2003, 840 p.
  2. Kochin N.E., Kibel’ I.A., Roze N.V. Teoreticheskaya gidromekhanika [Theoretical Hydromechanics]. Part 1, OGIZ Publ., L.-M., 1941, 348 p.
  3. Schlichting H. Teoriya pogranichnogo sloya [Boundary Layer Theory]. Edited by Loycyanskiy L.G. Nauka Publ., Moscow, 1974, 711 p.
  4. Maslov N.N. Mekhanika gruntov v praktike stroitel’stva (opolzni i bor’ba s nimi) [Soil Mechanics in the Construction Practice (Landslides and Their Control). Stroiizdat Publ., Moscow, 1977, 320 p.

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CREEPING COUNTER VORTEX FLOW

Vestnik MGSU 4/2013
  • Orekhov Genrikh Vasil’evich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Chair, Department of Hydroelectric Engineering and Use of Aquatic Resources; +7 (499) 182-99-58, 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 .
  • Zuykov Andrey L’vovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Chair, Department of Hydraulics; +7(495)287-49-14, ext. 14-18, 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 .
  • Volshanik Valeriy Valentinovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Professor, Department of Hydroelectric Engineering and Use of Aquatic Resource, 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 172-180

The authors have performed an analytical research into one of the most complex types of heterogeneous 3D flows of fluids and gases, that is, a creeping counter vortex flow. The “creeping counter vortex flow” is the flow that is formed as a result of interaction between two or more slow concurrent co-axial circulatory longitudinal flows swirling in the opposite directions.Creeping flows are typical for numerous structural elements of machines, mechanisms, items of equipment and devices, if the flow velocity or cross dimensions of channels are small or, alternatively, if the viscosity of the fluid is high. This model designed by the coauthors, serves as the basis for the hydrodynamic theory of lubrication. If the flow velocity is small and the viscosity of the liquid media is substantial, inertial convective summands can be ignored for Navier — Stokes equations.The coauthors believe that the research into the phenomena of the creeping counter vortex flow as one of the types of heterogeneous 3D flows of fluids and gases has a strong potential in space technologies, and it may be elaborated in further research projects to be developed by the coauthors.

DOI: 10.22227/1997-0935.2013.4.172-180

References
  1. Korn G., Korn T. Spravochnik po matematike dlya nauchnykh rabotnikov i inzhenerov [Reference Book of Mathematics for Researchers and Engineers]. Moscow, Nauka Publ., 1970, 720 p.
  2. Zuykov A.L. Analiz izmeneniya profilya tangentsial’nykh skorostey v techenii za lokal’nym zavihritelem [Analysis of Changes in the Profile of Tangential Velocities of the Flow Shaped Up by the Local Swirler]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering], 2012, no. 5, pð. 23—28.

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