Abstract
1. The off-design operating regime of the Chirkey hydrostation with difficulties in producing electricity and with long periods of high upper pool levels under conditions of seismic activity negatively affects the reliability of the surrounding rock mass and should be brought into correspondence with the design. 2. Long and nonuniform operation of the Chirkey hydrostation outlet in 1997 showed sufficient reliability and efficiency of the structures, but activated negative processes in the surrounding rocks masses. The rupture of two rock bolts supporting the unstable mass on the left bank and increase of the rate of settlement of the left wall of the canyon are a warning signal. This requires a thorough examination of all support members and development of outlet operating rules. 3. The consequences of the operation of the outlet for the reliability and stress-strain state of the dam sould be specially and comprehensively studied and analyzed. It is urgently required to determine the forces in the rock bolts supporting the unstable mass, to determine the magnitude and places of maximum stresses in the dam, and to monitor the rate of movement of the left-bank slope. 4. It is urgently necessary to organize appropriate seismometric monitoring on the dam and to obtain daily (weekly) bulletins of the Dubka seismic station and periodic reports of the OMP DNTs on the seismological situation in the region. 5. Before organizing seismometric monitoring on the dam or geodynamic test area of the Center of the Geodynamic Observation Service in the Electric Power Industry, it is necessary to use the earthquake prediction method of the Joint Institute of Physics of the Earth with the help of the dam's existing measuring systems. For this purpose it is advisable to automate the reversed plump lines by the “Sibgeoinform” or DIGES (Diagnosis of Hydraulic, Power, and Other Essential Structures) method and to increase the accuracy and frequency of seepage observation.
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