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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Usingsteel beams with corrugated web in hydraulic structures

Vestnik MGSU 11/2013
  • Bal'zannikov Mikhail Ivanovich - Samara State University of Architecture and Civil Engineering (SGASU) Doctor of Technical Sciences, Professor, Chair, Department of Environmental Protection and Hydraulic Engineering Structures, Rector, Samara State University of Architecture and Civil Engineering (SGASU), 194 Molodogvardeyskaya St., Samara, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kholopov Igor’ Serafimovich - Samara State University of Architecture and Civil Engineering (SGASU) Doctor of Technical Sciences, Professor, Chair, Department of Steel and Timber Structures; +7(846)332-09-36, Samara State University of Architecture and Civil Engineering (SGASU), 194 Molodogvardeyskaya St., Samara, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Solov'ev Aleksey Vital'evich - Samara State University of Architecture and Civil Engineering (SGASU) Candidate of Technical Sciences, Assistant Professor, Department of Steel and Timber Structures, Samara State University of Architecture and Civil Engineering (SGASU), 194 Molodogvardeyskaya St., Samara, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Lukin Aleksey Olegovich - Samara State University of Architecture and Civil Engineering (SSUACE) assistant lecturer, Department of Metal and Timber Structures; +7 (846) 332-14-65, Samara State University of Architecture and Civil Engineering (SSUACE), 194 Molodogvardeyskaya st., Samara, 443001, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 34-41

The article is devoted to exploring the use of beams with corrugated web in the construction of hydraulic structures. Two groups of metal structures of hydraulic structures are considered, depending on their operating conditions:structures not related to water retention;construction designed for water retention.Operating conditions of the first group of structures are similar with the structures of industrial buildings. Hence, it is possible to use the beams with a corrugated web but with a larger web thickness. In the constructions of the second group the operating conditions significantly differ from the first group. These structures are constantly in water or in humid state and therefore additional measures are required to ensure reliability.Two positive factors contribute to the introduction of corrugated web beams in the construction of flat gates:the lack of concentrated loads which strongly affects the bearing capacity of beams;general stability of the beams is ensured by the continuous supported compression flange.At the first stage of the study the girder of the flat gate was designed of beams with corrugated web. Design of beams with corrugated web was carried by the Eurocode 3. The mass comparison of beams with corrugated web with the previously found crosssection with a flat solid web showed the savings of up to 5.2 %. By varying the parameters of the corrugations savings can increase to 8—10 %.The studies showed that the introduction of corrugated web beams in the construction of hydraulic structures is appropriate. Some tasks require additional research.

DOI: 10.22227/1997-0935.2013.11.34-41

References
  1. Pasternak H., Kubieniec G. Plate Girders with Corrugated Webs. Journal of Civil Engineering and Management. 2010, vol. 16, no. 2, pp. 166—171.
  2. Kholopov I.S., Bal'zannikov M.I., Alpatov V.Ju. Primenenie reshetchatykh prostranstvennykh metallicheskikh konstruktsiy v pokrytiyakh mashinnykh zalov GES [The Use of Spatial Grid Metal Structures in the Roofs of HPP Turbine Rooms]. Vestnik Volgogradskogo gosudarstvennogo arkhitekturno-stroite?nogo universiteta. Seriya: Stroite?stvo i arkhitektura [Bulletin of Volgograd State University of Architecture and Civil Engineering. Series: Civil Engineering and Architecture]. 2012, no. 28 (47), pp. 225—232.
  3. Stal'nye konstruktsii v gidrotekhnicheskom stroitel'stve [Steel Structures in Hydraulic Engineering]. Morskoy biznes Severo-Zapada [Marine Business of the North-West]. 2005, no. 2. Available at: http://www.mbsz.ru/02/47726.php. Date of access: 28.07.2013.
  4. Kozinets G.L. Otsenka prochnosti i dolgovechnosti korrozionno-iznoshennykh metallokonstruktsiy gidrotekhnicheskikh zatvorov [Estimation of the Strength and Durability of Corrosion-worn Metal Structures of Hydraulic Gates]. Gidrotekhnicheskoe stroitel'stvo [Hydraulic engineering]. 2007, no. 1, pp. 35—39.
  5. Azhermachev S.G., Semenov P.S. O primenenii balok s gofrirovannymi stenkami v palubnykh konstruktsiyakh morskikh platform [On the Application of Beams with Corrugated Web in the Deck Construction of Offshore Platforms]. Stroitel'stvo i tekhnogennaya bezopasnost' [Construction and Technogenic Safety]. 2005, no. 10, pp. 13—16.
  6. Fedorishchev Yu.V. Antikorrozionnaya zashchita gidrotekhnicheskikh sooruzheniy: kompleksnye resheniya ot kompanii «Amvit» [Corrosion Protection of Hydraulic Structures: Integrated Solutions from the Company "Amvit"]. Gidrotekhnika [Hydrotechnics]. 2010, no. 1, pp. 80—81.
  7. Jotun — mirovoy lider v proizvodstve zashchitnykh pokrytiy [Jotun — the World Leader in the Production of Protective Coatings]. Gidrotekhnika [Hydrotechnics]. 2009, no. 1, pp. 80—81.
  8. Abbas H.H., Sause R., Driver R.G. Behavior of Corrugated Web I-Girders under In-Plane Loads. Journal of Engineering Mechanics. 2006, vol. 132, no. 8, pp. 806—814.
  9. Zubkov V.A., Lukin A.O. Eksperimental’nye issledovaniya vliyaniya tekhnologicheskikh i konstruktsionnykh parametrov na nesushchuyu sposobnost’ metallicheskikh balok s gofrirovannoy stenkoy [Experimental Research into the Influence Produced by Process-related and Structural Parameters on the Bearing Capacity of Metal Beams with Corrugated Webs]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2013, no. 2, pp. 37—46.
  10. K?vesdi B., Dunai L. Determination of the patch loading resistance of girders with corrugated webs using nonlinear finite element analysis. Computers and Structures. 2011, vol. 89, no. 21—22, pp. 2010—2019.

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Statistical analysis of determining the filtration heterogeneity of foundation rock mass of hydraulic structures on the example of the boguchanskaya hpp

Vestnik MGSU 1/2016
  • 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 .
  • Zommer Tat’yana Valentinovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Lecturer, Department of Engineering Geology and Geoecology, head, Laboratory of Hydraulics, 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 .
  • Lavrusevich Andrey Aleksandrovich - 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 150-160

In the article the authors carried out a statistical analysis of mass determination of the filtration coefficient, which allows us to construct the most accurate calculation model of seepage field of inhomogeneous bedrock foundation of the dam needed for seepage calculations and to predict seepage regime of hydraulic structures and their grounds. The algorithm can be applied to analyze heterogeneity based on the large set of definitions of the properties of soil, subject to the condition that within the engineering geological element of random fluctuations of the index properties or some of its functions, e.g., logarithm of index properties, obey normal distribution law. In the latter case, all digital values of the index should be recalculated and presented in the form, in which they submit to the law of normal distribution. The authors received effective evaluation of the filtration coefficient on the basis of the law of statistical distribution. Correspondence of each component to a particular genetic element of the array is derived from the premise, adopted prior to the mathematical analysis: we divided the total distribution into separate normal distributions, and normal distribution is only true for a genetically separate engineering-geological element. After finding boundary values of the distributions it is required to determine the cut regions, in which relevant engineering-geological elements are localized, with the help of specially designed algorithm. In order to clarify geological distinction between the various lithological zones, zones of weathered and fractured zones, we use numerical data of filtration sampling. Then we put the numerical values of the index properties of lgq on which segmentation of the array occurs, on a geological cross section, respectively, for each well. After assigning numerical codes to the individual values of the indicator properties you can begin to image the geological section, where we combine the intervals with identical key values in the second position of the code. The boundaries between the drilled wells are held on a Pro forma basis for geological reasons. For example, if the set of values with the largest number lgq, which corresponds to the species with a visually perceptible change when exposed to weathering, has a number 4, the boundaries between the drilled wells will naturally stretch along the roof of the bedrock. If according to the proposed methodology, within the limited element number 4, the interval is flagged with number 3, it can be interpreted as the appearance of the outcrop of other rocks. In this case we need to show the boundary of engineering-geological element with a smaller value of lgq around the 3, than it is inside the engineering-geological element number 4. For each of the obtained groups of values, calculated using known statistical formulas, we calculated the mean value and other statistical estimates that are useful in practice. For example, the geometric mean is an effective in a hydraulic sense evaluation of the specific absorption coefficient of the filter. So the authors proposed a formalized approach to defining the structural elements of the filtration field inhomogeneity of a rock mass of hydraulic structures foundation on the basis of statistical analysis. The article shows how to highlight the engineering-geological elements with the filtration inhomogeneity of rocky soils on the example of the Boguchanskaya HPP on the Angara River.

DOI: 10.22227/1997-0935.2016.1.150-160

References
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  2. Raymer J., Maerz N.H. Effect of Variability on Average Rock-Mass Permeability. 48th US Rock Mechanics. Geomechanics Symposium, University of Minnesota, Twin Cities CampusMinneapolis, United States, 1—4 June 2014, no. 3, pp. 1822—1829.
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  4. Zertsalov M.G., Tolstikov V.V. Uchet uprugoplasticheskoy raboty betonnykh plotin i skal’nykh osnovaniy v raschetakh s ispol’zovaniem MKE [Account for Elastic Plastic Operation of Concrete Dams and Rock Foundations in Calculations Using FEM]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 1988, no. 8, pp. 33—36. (In Russian)
  5. Chernyshev S.N., Dearman W. Rock Fractures. London, Butterwort-Heinemann, 1991, 272 p.
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  7. Mohajerani S., Baghbanan A., Bagherpour R., Hashemolhosseini H. Grout Penetration in Fractured Rock Mass Using a New Developed Explicit Algorithm. International Journal of Rock Mechanics and Mining Sciences. 2015, vol. 80, pp. 412—417. DOI: http://www.doi.org/10.1016/j.ijrmms.2015.06.013.
  8. Chernyshev S.N. Estimation of the Permeability of the Jointy Rocks in Massif. Symp on Percolation through Fissured Rock, Proc., Sep 18—19 1972. Stuttgart, W Ger.
  9. Chernyshev S.N. Dvizhenie vody po setyam treshchin [Water Motion through the Network of Cracks]. Moscow, Nedra Publ., 1979, 142 p. (In Russian)
  10. Gaziev E.G., Rechitskiy V.I., Borovykh T.N. Issledovanie fil’tratsionnogo potoka v blochnoy srede primenitel’no k proektirovaniyu sooruzheniy v skal’nykh massivakh [Investigation of Filtration Flow in Block Environment in Design of Structures in Rock Masses]. Trudy Gidroproekta [Works of Hydroproject]. 1980, no. 68, pp. 137—147. (In Russian)
  11. P 54—90. Metodika sostavleniya modeley vodopronitsaemosti skal’nykh massivov v osnovaniyakh gidrotekhnicheskikh sooruzheniy [Article 54—90. Methods of Creating Waterproof Models of Rock Masses in Foundations of Hydraulic Structures]. Posobie k SNiP 2.02.02—85 [Manual to Construction Rules SNiP 2.02.02—85]. Saint Petersburg, VNIIG Publ., 1992, 97 p. (In Russian)
  12. Chernyshev S.N. Ekzogennye deformatsii trappov v doline r. Angary [Exogenous Deformations of Traps in the Valley of Angara River]. Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka [News of Institutions of Higher Education. Geology and Esploration]. 1965, no. 12, pp. 78—85. (In Russian)
  13. Rats M.V., Chernyshev S.N., Sleptsov B.G. Razrabotka kriteriev optimal’noy glubiny vrezki betonnykh plotin v skal’nye osnovaniya. Statisticheskiy analiz vodopronitsaemosti osnovaniya Boguchanskoy GES [Developing the Criteria of Optimal Incision Depth of Concrete Dams into Rock Foundations. Statistical Analysis of Water Permeability of the Boguchanskaya HPP Foundation]. Moscow, PNIIIS Publ., 1975. (In Russian)
  14. Rasskazov L.N., Aniskin N.A. Fil’tratsionnye raschety gidrotekhnicheskikh sooruzheniy i osnovaniy [Filtration Calculations of Hydraulic Structures and Foundations]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 2000, no. 11, pp. 2—7. (In Russian)
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  17. Khodzinskaya A.G., Zommer T.V. Gidravlika i gidrologiya transportnykh sooruzheniy. Uchebnoe posobie [Hydraulics and Hydrology of Transport Constructions. Study Guide]. Moscow, 2014, 92 p. (In Russian)
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  20. Chapovskiy A.E., Pertsovskiy V.V. Eksperimental’noe issledovanie neodnorodnosti gornykh porod v plane [Experimantal Investigation of Rock Inhomogeneity in Plan]. Razvedka i okhrana nedr [Exploration and Preservation of Mineral Resources]. 1972, no. 1, pp. 45—49. (In Russian)
  21. Samsonov B.G., Zil’bershteyn B.M., Burdakova O.L. Opredelenie gidrogeologicheskikh parametrov pri effektivnoy neodnorodnosti vodonosnykh gorizontov [Determination of Hydrogeological Parameters in Cose of Effective Inhomogeneity of Aquifers]. Gidrologiya i inzhenernaya geologiya. Ekspress-informatsiya VIEMS, MG SSSR [Hydrology and Engineering Geology. Express Information of VIEMS, MG USSR]. 1972, no. 4. (In Russian)
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  24. Rasskazov L.N., Aniskin N.A., Bestuzheva A.S., Sainov M.P., Tolstikov V.V. Sangtudinskiy gidrouzel: napryazhenno-deformirovannoe sostoyanie i fil’tratsiya v osnovanii plotiny i v obkhod gidrouzla [Sangtudinsk Hydroengineering Complex: Stress-Strain State and Filtration in the Dam Foundation and Bypassing the Hydroengineering Complex]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 2008, no. 5, pp. 45—58. (In Russian)
  25. Rasskazov L.N., Aniskin N.A. Filtration Calculations for Hydraulic Structures and Foundation Beds. Hydrotechnical Construction. 2000, vol. 34, no. 11, pp. 525—530. DOI: http://www.doi.org/10.1023/A:1017582706924.
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  27. Gudmundsson A., Lo Tveit I.F. Sills as Fractured Hydrocarbon Reservoirs: Examples and Models. Geological Society Special Publication. 2014, vol. 374 (1), pp. 251—271. DOI: http://www.doi.org/10.1144/SP374.5.

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Method of determining the filtration heterogeneity of a rock mass of hydraulic structure foundation

Vestnik MGSU 2/2016
  • 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 .
  • Zommer Tat’yana Valentinovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Lecturer, Department of Engineering Geology and Geoecology, head, Laboratory of Hydraulics, 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 .
  • Lavrusevich Andrey Aleksandrovich - 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 116-125

N THE ARTICLE THE AUTHOR’S TECHNIQUE OF ESTIMATING THE FLOW HETEROGENEITY OF A ROCK MASS OF WATERWORKS FOUNDATION IS CONSIDERED. THE METHOD FOR ALLOCATING THE ENGINEERING-GEOLOGICAL ELEMENTS ON THE BASIS OF THE FILTRATION HETEROGENEITY OF ROCKY SOILS IS UPDATED ON THE EXAMPLE OF BOGUCHANSKAYA HPP ON THE ANGARA RIVER. THE AUTHORS INVESTIGATED THE APPLICABILITY OF THE PROPOSED METHODS FOR DETERMINING THE FILTRATION INHOMOGENEITY OF A ROCK FOUNDATION OF HYDRAULIC STRUCTURES IN ORDER TO BETTER HIGHLIGHT THE ENGINEERING-GEOLOGICAL ELEMENTS ON THE EXAMPLE OF THE BOGUCHANY HYDROELECTRIC COMPLEX. WHEN ANALYZING THE FACTUAL MATERIAL BY THE RESULTS OF ABOUT 1000 FILTRATION EXPERIMENTS FROM GEOLOGICAL CONSIDERATIONS AND IN ORDER TO SEPARATE THE DATA, WE HAVE IDENTIFIED THREE ROCKY SOIL MASSES. THE FIRST MASSIF IS THE RIGHT BANK OF THE FOLDED THICKNESS OF SEDIMENTARY ROCKS THAT SLOPE TOWARDS THE RIVER AND IS SUBJECT TO SIGNIFICANT SUPERGENE CHANGES. THE SECOND MASSIF INCLUDES UNDERFLOW AND LEFT-COAST SEDIMENTARY ROCKS, WHICH ARE LESS ALTERED BY SUPERGENE PROCESSES THAN THE RIGHT COAST FOR A NUMBER OF REASONS. THE THIRD ARRAY CONSISTS OF DOLERITE UNDER THE RIVERBED AND ON THE RIGHT BANK. FOR THESE THREE ARRAYS ACCORDING TO THE RESULTS OF THE FILTRATION EXPERIMENTS, WE HAVE BUILT HISTOGRAMS OF THE DISTRIBUTION OF LGQ AND DIFFERENTIAL CURVES OF DISTRIBUTION OF THE SPECIFIC ABSORPTION FOR DOLERITES IN THE AREA KODINSKY OF THE BOGUCHANSKAYA HPP. THEN IN THE HISTOGRAM WE IDENTIFIED THE CORRESPONDING VALUES OF THE MODAL COMPONENTS OF THE DISTRIBUTION AND FOUND THE STATISTICAL CHARACTERISTICS FOR EACH OF THE SELECTED DISTRIBUTIONS, AS WELL AS THE MEAN VALUE AND THE VARIANCE. FOR FURTHER OPERATIONS, WE COMPUTED THE STANDARD DEVIATION S FOR EACH OF THE DISTRIBUTIONS. THE DEGREE OF FRACTURE IS EVALUATED BY TAKING INTO ACCOUNT THE INDICATOR OF PERMEABILITY, THEREFORE, THE MAIN GEOLOGICAL CHARACTERISTICS OF THE CRACKS ARE THEIR WIDTH AND LENGTH, AND ONLY AFTER ALL THIS WILL TAKE INTO ACCOUNT THEIR FREQUENCY. THEN WE BEGIN SEARCHING THE LOCATIONS ON A SECTION OF FRACTURE ZONES, WHICH CORRESPOND TO THE COMPONENTS IN THE DISTRIBUTION FORMULA. SO WE DISTINGUISH THE SUMMANDS OF THE SUM ON THE FORMULA DISTRIBUTION: FOR SEDIMENTARY ROCKS OF THE RIVERBED - 3; FOR DOLERITE - 3; FOR A MASSIF OF SEDIMENTARY ROCKS ON THE RIGHT BANK WITH THE MOST COMPLEX STRUCTURE - 6 ZONES WITH DIFFERENT FRACTURE. THE DETERMINATION OF ZONES WITH DIFFERENT FRACTURING IN ACCORDANCE WITH THE DESCRIBED PROCEDURE ALLOWED US TO CONSTRUCT A RESULTING FILTRATION SECTION FOR THE THREE MASSIFS. AS A RESULT, ACCORDING TO THE ABOVE METHOD, BASED ON THE ANALYSIS OF FACTUAL MATERIAL, INCLUDING THE RESULTS OF NUMEROUS FILTRATION EXPERIMENTS, THE AUTHORS CONSTRUCTED THE RESULTING FILTRATION HYDROGEOLOGICAL SECTION. THIS TECHNIQUE IS STATISTICAL AND GENETIC IN NATURE, THEREFORE IT SEEMS MORE EFFECTIVE COMPARED WITH THE METHOD OF REGRESSION ANALYSIS RECOMMENDED IN THE APPENDIX TO SNIP. THUS, THE PROPOSED FORMALIZED METHODOLOGY FOR THE SEPARATION OF ROCK SOILS LOCATED AT THE BASE OF HPP TO INDIVIDUAL ENGINEERING-GEOLOGICAL ELEMENTS ACCORDING TO THE RESULTS OF EXPERIMENTAL MASS FILTRATION TESTING OF DRILLING WELLS HAS ALLOWED US TO ISOLATE THE HETEROGENEOUS FRACTURE PERMEABILITY AND GEOTECHNICAL ELEMENTS IN THE BASIS OF HPP (IN THE CASE OF THE BOGUCHANSKAYA HPP, WE HAVE IDENTIFIED 11 ENGINEERING-GEOLOGICAL ELEMENTS), AND ALLOWED US TO FIND THE BOUNDARIES OF ENGINEERING-GEOLOGICAL ELEMENTS IN GEOLOGICAL CROSS-SECTIONS. IN ADDITION, WE DETERMINED THE EFFECTIVE VALUES OF FILTRATION COEFFICIENT FOR EACH ENGINEERING-GEOLOGICAL ELEMENT INDICATING THE CONFIDENCE INTERVALS FOR THE MEAN VALUE AT THE 95 % CONFIDENCE LEVEL.

DOI: 10.22227/1997-0935.2016.2.116-125

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Specifications of the hydraulic flow regime for the ending portion of the pressure tubular spillways with a vertical flow outlet

Vestnik MGSU 10/2018 Volume 13
  • Bakhtin Bronislav M. - Russian State Agrarian University - Moscow Timiryazev Agricultural Academy doctor of technical science, professor, Department of Hydraulic Structures, Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, 49, Timiryazevskaya st., Moscow, 127550, Russian Federation.
  • Mikhaylets Dmitriy P. - Russian State Agrarian University - Moscow Timiryazev Agricultural Academy post graduatestudent, Department of Hydraulic Structures, Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, 49, Timiryazevskaya st., Moscow, 127550, Russian Federation.
  • Bushuev Dmitriy A. - Russian State Agrarian University - Moscow Timiryazev Agricultural Academy master student, Department of Hydraulic Structures, Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, 49, Timiryazevskaya st., Moscow, 127550, Russian Federation.

Pages 1269-1275

Introduction. An approach to the study of the hydraulic flow regime behind the end section is presented in order to determine the possibility of ensuring uniform distribution of speeds across the width of the outflow channel and safe coupling of the outgoing flow to the lower pool. The four variants of designs of the ending portion of the pressure tubular spillways with a vertical flow outlet are considered, following constructions: a disk reflector, a flat horizontal sector reflector, a flat slanted sector reflector and a curved sector reflector. Materials and methods. The most common approach to the comparison of structures were made according to the following parameters: the length of the stream’s flight, the width of the jet, the form of flow spreading, the uniformity of the distribution of specific water flow, clash of the jet on the slopes of the channel. The diameter of the conduit on the model is d = 3.4 cm, the cost of Q = 0.67...2.44 l/s, pressure head H = 35...60 cm. For comparison of the chosen design with similar geometric parameters: the relative radiuses of the sectors of the reflector R/d = 3.0 and relative diameter of the disk-reflector D/d = 3.0. Results. The lengths of the jet departure are determined for disk and flat sector in the relative height range of t/d from 0.5 to 1.0, for slanted and curved sectors-from 0 to 1.0. The planned outlines of the jet are determined, the uniformity of the distribution of specific water discharge is estimated, the analysis of the hydraulic regime of the presented end portions is carried out. Conclusions. In of civil engineering the revealed advantages and disadvantages of the considered end portions allow to recommend it for use taking into account the peculiarities of the hydraulic regimes arising at the same time. The greatest length of the jet departure has a curved sector-reflector, and the smallest - a flat horizontal sector-reflector. Lowest unit costs are achieved with a disc reflector, the largest in the flat horizontal sector-reflector.

DOI: 10.22227/1997-0935.2018.10.1269-1275

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