FIELD: construction.;SUBSTANCE: method includes reduction of maximum safe level of water in front of dam, opposite to such earlier set level, and thermal treatment of the upper arc belt body and holding rocks with facilities in areas of the upper arc belt soles adjacency. Thermal treatment is carried out with intensity that provides for reduction of stretching stresses in concrete near upper (discharge) face of dam down to the safe value at the water levels in front of the dam close to reduced maximum safe level.;EFFECT: reduced stretching forces in concrete near upper face of dam and in rocks of base, irreversible movements of dam rib towards lower reach, compressible tensions in reinforced concrete facing of turbine water ducts, asymmetrical movements of dam rib and scope of works.;9 cl, 4 dwg
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