Calculative and experimental studies of reinforced concrete flood control structures and pressure structures at hydroelectric power stations

Introduction. The pressure walls of the machine rooms and the shield walls of the reinforced concrete channel buildings of hydroelectric power plants/pumped-storage hydroelectric power plants are subjected to the pressure of the upper/lower water level, which is transmitted to the floors and other structures of the buildings. The condition of the structures of long-term operated reinforced concrete channel buildings of hydroelectric power plants/pumped-storage hydroelectric power plants may require their reinforcement, for example, with external reinforcement made of carbon composite materials.

Materials and methods. The load-bearing structures of the reinforced concrete channel buildings of hydroelectric power plants and pumped-storage power plants were installed, and their condition may require reinforcement. Laboratory tests have been conducted on models of a section of the upper wall of the machine hall of a reinforced concrete channel building of a hydroelectric power plant at a scale of 1:15 (without reinforcement and with reinforcement using carbon composite tape on the stretched edge). Numerical finite element methods are used to conduct computational studies of the stress-strain state of the channel building of a hydroelectric power plant/pumped-storage power plant.

Results. The experimental studies demonstrated a significant positive effect of external reinforcement on the displacement of the top of the models, the opening width of the inter-block joints, and the stress in the tensioned reinforcement within the joints. A three-dimensional mathematical model of a river-bed hydroelectric power plant was developed for computational studies.

Conclusions. The condition of the structures of long-term operated reinforced concrete channel buildings of hydroelectric power plants and pressure buildings of pumped-storage hydroelectric power plants may necessitate their reinforcement, for example, with external reinforcement made from carbon composite materials. Based on the results of the laboratory studies, the method of reinforcing the structure of the upper wall of the machine hall of a reinforced concrete channel building of a hydroelectric power plant using carbon composite tapes was validated. A three-dimensional mathematical model of a hydroelectric power plant channel building was created to conduct computational studies.

1. Raja A.K., Srivastava A.P., Dwivedi M. Power Plant Engineering. New Delhi, New Age International, 2006; 354.

2. Lenkov A.Yu., Fisenko V.F. Experience gained from operation of the hydraulic structures of the Votkinsk hydroelectric power plant. Power Technology and Engineering. 2017; 51(1):33-39. DOI: 10.1007/s10749-017-0779-y

3. Vasilevskaya L.S., Anufrenkova P.S., Gracheva D.A. Evaluation of Concrete Structure Condition of the Volzhskaya Hydroelectric Power Plant. Power Technology and Engineering. 2018; 52(2):181-184. DOI: 10.1007/s10749-018-0929-x

4. Rodrigues R.V. Structural Design of a Surface Hydropower Plant. Technical University of Lisbon, 2014; 1-9.

5. Bellendir E.N., Lisichkin S.E., Rubin O.D. The operational state justification of the building of the station unit of Zagorskaya PSPP-2. Power Technology and Engineering. 2020; 10:5-13. EDN ILATSL. (rus.).

6. Rubin O.D., Bellendir E.N., Frolov K.E., Baklykov I.V., Iljin Yu.A., Lisichkin S.E. Analysis of the nature of cracking of the walls of the building of the HSPP station unit and the walls of the floating bulkhead of the dry dock with the development of measures on strengthening. Prirodoobustrojstvo. 2022; 4:63-74. DOI: 10.26897/1997-6011-2022-4-63-74. EDN FBAMPY. (rus.).

7. Danila S., Shikshnis A. The state of hydraulic structures and the environment of the Kruonis pumped storage power plant. Power Technology and Engineering. 2007; 7:1-14. EDN IAHKVD. (rus.).

8. Potashnik N.I. Some issues of operation of the Kyiv pumped storage power plant. Power Technology and Engineering. 1978; 7:9-12. (rus.).

9. Rubin O.D., Ilyin Yu.A., Lisichkin S.E., Nefedov A.V., Rozanova N.V., Chernenko V.N. Assessment of the stress-strain state and strength of reinforced concrete structures of compensation sections of pressure water pipelines of the Zagorsk Pumped Storage Power Plant. Power Technology and Engineering. 2001; 9:16-19. (rus.).

10. Rubin O.D., Lisitchkin S.Ye., Grebenschikov V.P., Tsibakov V.A., Nefedov A.V., Katanov A.D. et al. Calculation substantiation of decisions on providing reliability of water discharge structure No. 2 of Bogutchaevsk HPP concrete dam. Proceedings of the VNIIG. 2005; 244:228-234. EDN IBXJZX. (rus.).

11. Rubin O.D., Lisichkin S.E., Lyapin O.B., Nefedov A.V. Research of concrete and reinforced concrete energy structures. Power Technology and Engineering. 1999; 8/9:22-28. (rus.).

12. Rubin O.D., Antonov A.S., Lisichkin S.E., Baklykov I.V., Bekin N.V., Frolov K.E. Estimated justification of technical decision on strengthening reinforced concrete machine hall floor. Construction: Science and Education. 2019; 9(1):(31):4. DOI: 10.22227/2305-5502.2019.1.4. EDN ZYDXID. (rus.).

13. Spyrakos C.C., Raftoyiannis I.G., Credali L., Ussia J. Experimental and Analytical Study on Reinforced Concrete Beams in Bending Strengthened with FRP. The Open Construction and Building Technology Journal. 2014; 8(1):153-163. DOI: 10.2174/1874836801408010153

14. Zhou Y., Gou M., Zhang F., Zhang S., Wang D. Reinforced concrete beams strengthened with carbon fiber reinforced polymer by friction hybrid bond technique: Experimental investigation. Materials & Design. 2013; 50:130-139. DOI: 10.1016/J. MATDES.2013.02.089

15. Gerfanova O.A., Osipov P.V., Frolov K.E. Civil structures external reinforcement system with polymer composites based on carbon fibers for hydrotechnical construction. Proceedings of the VNIIG. 2019; 291:36-46. EDN MNQORR. (rus.).

16. Serdyuk A.I., Chernyavsky V.L. Experience Reinforcing Building Structures with Composite Materials during the Reconstruction of the Baksan Hydroelectric Power Station. The Hydrotechnika. 2013; 3:115-117. (rus.).

17. Aleksandrov A.V. Development and justification of a method for leveling hydraulic structures subjected to uneven settlement. Moscow, 2018; 172. EDN MYQZRT. (rus.).

18. Aleksandrov A.V., Belledir E.N., Lashchenov S.Ya., Alzhanov R.Sh. Elimination of the Consequences of Settlement of the Zagorsk Pumped Storage Power Plant-2 Station Building and Restoration Work. Power Technology and Engineering. 2016; 7:2-10. EDN WHPWUX. (rus.).

19. Bellendir E.N., Lisichkin S.E., Rubin O.D. The Operational State Justification of the Building of the Station Unit of Zagorskaya PSPP-2. Power Technology and Engineering. 2021; 54(6):806-813. DOI: 10.1007/s10749-021-01291-6. EDN ETYFOA.