Conclusions
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1.
Examining the indices characterizing the stability and strength of the structure as a whole, we note that uplift on the base of the powerhouse does not exceed the design values, the movements of the soil stratum under the right-bank abutment noted twice in recent years have a local character, the deformations of the foundation (settlements, displacements) can be attributed to slowly developing processes, the results of calculating the stability and the actual stresses in the anchoring fittings of the blanket indicate the presence of a sufficient factor of safety and stability of the powerhouse-foundation system. Thus the state of the powerhouse at present can be considered satisfactory.
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2.
Since the causes of movement of the soil spectrum are presently still not completely clear and the relation between these movements and the slowly developing deformations also is not clear, a long-range forecast of the state of the structure under such conditions is practically impossible. This circumstance makes it necessary to impose especially high requirements on the reliability and promptness of current monitoring.
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3.
For monitoring the state of the powerhouse, observations of the stresses in the fittings of the blanket where they join the foundation slab and of the deformations of the joint between the blanket and foundation slab are of primary importance. Other no less important parameters are the discharges and suspension-containing flows in the drainage of the powerhouse. In view of the exceptional importance of this type of observation for revealing the causes of movements, it is necessary to find the technical possibilities of their organization in the immediate future.
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4.
Since the new row of drainage wells of the right slope proved to be ineffective, it is necessary to continue searching for the possibility of transferring the discharge zone of the Amata-Gauya horizon to a greater distance from the main structures.
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Literature cited
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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 42–46, September, 1987.
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Nosova, O.N., Egorova, L.G., Shakars, I.É. et al. Some results of investigating the state of the powerhouse of the Plyavinyas hydroelectric station. Hydrotechnical Construction 21, 552–558 (1987). https://doi.org/10.1007/BF01442641
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DOI: https://doi.org/10.1007/BF01442641