BEHAVIOR OF THE DAM OF THE SAYANO-SHUSHENSKAYA HYDROPOWER PLANT BEFORE AND AFTER RECONDITIONING

摘要

After filling of the storage reservoir of the Sayano-Shu-shenskaya HPP in 1989 it became obvious that the parameters characterizing the condition of the dam exceed the design values. Horizontal tensile cracks appeared on the pressure face of the dam and the contact in the foundation of the pressure face was disturbed (Fig. 1). The seepage through the dam concrete and though the foundation reached 520 and 549 liters/sec, respectively. The absence of bottom sluices did not permit emptying of the reservoir, and it was necessary to restore the water impermeability at a head of over 200 m. The high level of seepage did not allow the workers to use traditional grouts for injection. Workers of the HPP together with specialists of the Lengidroproekt Institute and representatives of the Soletange Company (France) developed a new process for reconditioning with the use of epoxy grouts. Pilot repair operations on the dam body began in 1995 and continued in 1996. After curing cracks in the body of the concrete dam, workers of the Sayano-Shushenskaya HPP continued to recondition the contact between the dam and the rock bed.