Condition of the Kureika hydroelectric station dam and engineering approaches to its repair

Conclusions

• 1. The dam core from DM 5+00 to DM 7+80 and from DM 8+50 to DM 13+80 is in a limit state. These stretches require taking immediate antiseepage measures, the stretch from DM 6+10 to DM 7+60 is top-priority.

• 2. A diaphragm wall made by the method of secant piles with a diameter of 1000–1200 mm is recommended as the antiseepage measure. The diaphragm wall is made from the dam crest, cut through the entire core, sands, and loamy sands in the foundation, and is carried down into loams. Plastic soilcrete with a compressive cube strength of 1–2 MPa and modulus of deformation 1000–2000 MPa is recommended as the material.

On November 12, 1997 the scientific and technical council of the Russian joint-stock company United Energy Systems examined the matter of the condition and repair of the dam. It recommended continuing comprehensive survey and research works for the purpose of increasing the operating reliability of the channel dam and refining the volumes, sequence, and improving the engineering approaches to the repair works, and carrying out works in the shortest possible time to eliminate the extreme situation.