Abstract
During construction of the Kureika hydroelectric station the diversion tunnel with headrace and tailrace channels was driven below the level of the Kureika River under the protection of upstream end downstream rock cofferdams. After completing the driving works on the tunnel it became necessary to destroy the rock cofferdams before the start of the flood (seconc half of May) to provide passage of the river waters during construction of the dam. It was sufficient to reduce the upstream cofferdam by 4 m, and therefore it was decided to destroy it by blasthole loosening charges with subsequent mucking by a backhoe. The downstream cofferdam had to be lowered by 6-7 m to reach the design levels, and therefore its excavation from under the water by the available excavating equipment was impossible. It was decided to remove the downstream rock cofferdam by an excavating explosion.
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