Earthquake resistance of basic structures at the Boguchany HPP

Abstract

Results of investigations of the earthquake resistance of structures are analyzed.The detailed design of the Boguchany HPP was developed in the 1990s when the seismicity of the region was evaluated at six points. The stress-strain state (SSS) of the basic structures had not been analyzed for a six-point seismic event in conformity with Construction Rule and Regulation II-59-74 "Riparian water-development works. Basic design positions," which was in force at that time.In 1999, the seismicity at the construction site of the Boguchany HPP was elevated, and is currently seven points with a repeatability of once every 5000 years (I norm = 7) according to the OSR-97-S map in Construction Rule and Regulation II-7-81* "Construction in seismic regions" [5].In 2000 -2002, the Center for Geodynamic Observations in the Power-Generation Industry (CGOPGI), Institute of the Earth's Crust, Siberian Division of the Russian Academy of Sciences (IEC SD RAS), and the Altai-Sayano Experimental and Seismological Party (EMSP) conducted seismological investigations in the area of the hydroproject's construction. As a result of the investigations, the level of the design intensity of earthquakes for the region of the Boguchany HPP was established at six points (I in = 6) based on the OSR-97-S map (i.e., with a design period of repeatability of the maximum design earthquake (MDE) of once in 5000 years), and up to five points based on the OSR-97-C map (with a design period of repeatability of the design earthquake (DE) of once in 1000 years) [7].According to the "Design rules for water-development works in seismic regions" [2], Construction Rule and Regulation II-7-81* "Construction in seismic regions" [5], and Construction Rule and Regulation 33-03 "Water-development works in seismic regions" [6], water-development works are not subject to analysis of seismic loads in a region with a six-point seismicity.In various organizations of the Krasnoyarsk Kray, doubts have been voiced concerning grounds for substantiation of the lowering of the level of the design seismicity, and, accordingly, the earthquake resistance of basic structures of the Boguchany HPP. To put these doubts to rest, the staff responsible for the construction charged the Institute Gidroproekt to conduct verification studies of the earthquake resistance of the concrete and rockfill dam (RFD), powerhouse, and service and production building (SPB) under an assigned seven-point seismicity (I in = 7). (Candidates of Technical Sciences A. V. Deineko and D. A. Krutov, and engineers L. D. Solov'eva and A. A. Yakushev participated in the studies).To utilize the design positions stated in Rules [2], and Construction Rules and Regulations [5] and [6], we conditionally worsened the seismic conditions at the construction site by a factor of two:-increased the initial seismicity from six to seven points (I in = 7) with a design period of once in 5,000 years; and, -lowered the class of the soils in the bed of the structures at the Boguchany HPP from Class I to Class I -II.The maximum peak ...

Analysis of the results of field and computational studies of the strength and stability of the stone-fill dam of the Boguchanskaya Hydroelectric Power Station, predicting its condition

“…В рамках моделирования грунтов тела плотины использовалась теория Кулона-Мора, а также модель упрочняющегося грунта Hardening Soil. При этом был учтен отечественный и зарубежный опыт моделирования бетонных и грунтовых гидротехнических сооружений с основаниями [3][4][5][6][7][8][9][10][11][12].…”

Mathematical modeling of stress-strain state of the system HPP building - soil base with account for the phased construction of the building

“…В то же время расчеты НДС бетонных сооружений (плотины, надземные здания гидроэлектростанции (ГЭС) и т.д.) выполняются до сих пор, как правило, при их мгновенном возведении [6][7][8][9][10][11][12][13][14][15]. Данный подход совершенно не правомочен, так как НДС бетонных сооружений формируется, в т.ч.…”