| Summary: | The authors give the description of an alternative construction variant of high-head Katun HPP where a reinforced-concrete faced rockfill dam will be the main water retaining structure. At the present moment it is doubtful that at the particular site a high-head complex will be constructed; the discussions are related only to the possibility of a medium-head project construction (to be called Altai HPP). Therefore, it is necessary to design Altai HPP in such a way that its concrete spillway dam will be further able to become a part of a high-head embankment dam. Therefore, we considered the alternative, where Katun HPP dam would be a combined dam by its structure; a high-head em-bankment dam will rest on a less high concrete dam.
All the structures were designed for this variant as well as river diversion scheme and the diversion layout at all construction stages were developed. For this purpose “drops in wells” are proposed to be used.
The combined dam structure was validated by the stress-strain state analysis under static and seismic loads. In order to improve shear strength of the concrete part of the dam it was proposed to arrange an upstream apron for decreasing seepage uplift.
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