State of the dam at the Zeya hydroelectric station with consideration of the geodynamic effect

Abstract

1. The Zeya dam is in a satisfactory state, but is operating under conditions different from the design assumptions, under the effect of geodynamic forces — natural and induced seismicity with mainly a transverse direction of the earthquake and, probably, creep pressure from the right bank. 2. The design model of a plane stress state adopted in the design does not correspond to the real conditions of the static behavior of the structure which is in a volume stress state. The presence of dynamic loads requires determination of the dynamic characteristics of the structure and corresponding check calculations. 3. The geodynamic effect on the SSS of the dam requires improvement of the system of on-site observations and the organization of a geodynamic test area at the Zeya hydrostation in accordance with the decisions of the Ministry of Fuel and Energy of the Russian Federation. Before the creation of this test area the geodynamic effects should be monitored by the available measuring instruments according to the method of OIFZ and VNIIG. 4. The existing structural members of the deck of the cavities between buttresses require improvement with consideration of their new, antiseismic function, their incorporation into the calculation scheme, and equipping with measuring instruments. 5. The state of the dam and conditions of its operation require the creation of a mathematical model of the structure with consideration of the results of on-site observations and creation of a data bank for predictive purposes.