Behavior of the Dam of the Sayano-Shushenskaya Hydropower Plant Before and After Reconditioning

Bryzgalov, V. I.; Gaziev, É. G.

doi:10.1023/b:hyco.0000036357.38113.77

Cited by 2 publications

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Section: Brief Historymentioning

confidence: 98%

“…Personnel at the hydroproject, together with specialists from the Lengidroproekt and the French firm Soletange, therefore developed a new procedure for repair operations using epoxy grouts, which was utilized for sealing cracks in both the body of the dam, and also in its rock bed during the period from 1996 through 2002. As a result of the work performed, the seepage flow through the body of the dam and rock bed was reduced by 99.5 and 78%, respectively [5].The repair work had inevitably made itself felt on the behavior of the dam and its rock bed.Briefly summarizing the results of the analysis, it is possible to note:1. Irreversible displacements of the dam in the direction of the tailrace had continued, and was of the order of 40% of the maximum displacements in the key section of the dam.…”

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confidence: 99%

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Analysis of the present stress-strain state of the arch-gravity dam at the Sayano-Shushenskaya HPP

Gaziev

2011

Power Technol Eng

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The present analysis is dictated by the need to assess the present condition of the arch-gravity dam at the Sayano-Shushenskaya HPP (SSHPP) in connection with a failure that had developed at the power plant and was followed by shutdown of all 10 generating sets, and by the need to pass drawdown flows through the spillways in the body of the dam. This situation placed the dam under special unforeseen operating conditions with use of spillway openings in the body of the dam during the winter.The stress-strain state of the dam and its bed, which had been caused by hydrostatic load and temperature, has been analyzed, and the dynamics of irreversible (residual) displacements of the dam exposed based on analysis of available data derived from previously conducted investigations, and also observations performed right up to February 2010 by the monitoring service GTS at the SSHPP. Brief HistoryConstruction of basic structures at the SSHPP was begun in 1968, and had been completed for the most part by the close of the 1980s. The dam was constructed under a partial head in 1978, and since 1990 had begun to operate in the design regime with annual filling of the reservoir to the normal backwater level (NBL) of 540 m, and with subsequent drawdown to the minimum operating level of 500 m.In terms of the combination of their basic parameters, the arch-gravity dam at the SSHPP has no analogies in world practice, and is one of the world's largest: it is 242 m high, the length along the crest is 1074 m, the width along the crest 25 m, and the width at the base 106 m. The maximum head is 220 m [1].For such a relationship between parameters of the structure, zones of loosening under the upstream face of the dam should have been expected to appear; this had also been confirmed by analytical and model investigations conducted as early as the detailed-design stage. In connection with the formation of a zone of loosening, the upper part of the grout curtain was found disturbed, resulting in a significant increase in seepage flows [2 -4].After the reservoir had been filled in 1989, it had become obvious that parameters of the stress-strain state of the dam exceeded values specified in the design. Horizontal tensile cracks appeared on the thrust front of the dam, and a disturbance was noted in the contact between the bed and thrust front of the dam. Filtration through the concrete of the dam and through the bed had reached 458 and 550 liters/sec, respectively. The absence of bottom discharges did not permit emptying of the reservoir, and it was therefore necessary to restore impermeability under a head of more than 200 m.The level of filtration did not make it possible to use traditional grouts for injection. Personnel at the hydroproject, together with specialists from the Lengidroproekt and the French firm Soletange, therefore developed a new procedure for repair operations using epoxy grouts, which was utilized for sealing cracks in both the body of the dam, and also in its rock bed during the period from 1996 through 2002. As a result...

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Section: Brief Historymentioning

confidence: 98%

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confidence: 99%

Analysis of the present stress-strain state of the arch-gravity dam at the Sayano-Shushenskaya HPP

Gaziev

2011

Power Technol Eng

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“…This scenario is not expected but did occur in the Sayano-Shushenskaya arch dam in Russia [1] and the Maneri-Hydel diversion tunnel in India [2]. Therefore, concrete cracking and the water penetration process have been the subject of many researches.…”

Section: Introductionmentioning

confidence: 99%

Definition of the general initial water penetration fracture criterion for concrete and its engineering application

Jiang

Ren

et al. 2011

Sci. China Technol. Sci.

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A general initial water penetration (seepage) fracture criterion for concrete is proposed to predict whether or not harmful water penetration (hydraulic fracturing), other than microcracking, will occur in concrete structures in a severe high water pressure environment. The final regression, of the different macroscopic failure types in concrete to microscopic Mode cracking, a Ⅰ llows the use of only one universal criterion to indicate the damage. Thus, a general initial water penetration fracture criterion is approximately defined as a strain magnitude of 1000×10 6 , based on the concept of tensile strain derived from experimental results in the relevant literature. Then, the locations of harmful water penetration fracture (hydraulic fracture) in the high arch dam mass of the Jinping first class hydropower project are analyzed using the nonlinear finite element method (FEM) according to the proposed criterion. The proposed criterion also holds promise for other concrete structures in high water pressure environments.concrete, initial water penetration fracture criterion, hydraulic fracture, tensile strain, Jinping high arch dam Citation:Jiang Y Z, Ren Q W, Xu W, et al. Definition of the general initial water penetration fracture criterion for concrete and its engineering application. Sci

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Behavior of the Dam of the Sayano-Shushenskaya Hydropower Plant Before and After Reconditioning

Cited by 2 publications

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Analysis of the present stress-strain state of the arch-gravity dam at the Sayano-Shushenskaya HPP

Analysis of the present stress-strain state of the arch-gravity dam at the Sayano-Shushenskaya HPP

Definition of the general initial water penetration fracture criterion for concrete and its engineering application

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