CONTROL OF STRESS-STRAIN STATE CHANGES IN CONCRETE OF HIGH-PRESSURE DAM BOTTOM SIDE.

Diagnostics and control of the hydro-technical construction state are the most important actions at the system of safety keeping with exploiting high-pressure dams. Considered in the paper stress-strain control system is attributed to special one in exploiting period. That system is non-traditional for hydro-technical constructions. It is aimed at specifying model calculations of stress-strain state of constructions, defining peculiarities of its deformation and can be used to enlarge the monitoring system at places where cast-in elements of control equipment are missed or destroyed. Series of experimental and analytical researches of stress-strain state of concrete of high-pressure Sayano-Shushenskayahydroelectric power stationwas carried out to obtain methodical approach to the control system. Results of many years’ observations to changes in stress-strain state of concrete of dambottom side are given in the paper. Those results are obtained during exploiting the Sayano-Shushnskaya hydroelectric power station. Values of stress increments resulted from filling and empty the reservoir are defined. The tendency towards annual increase of compressible stresses in console direction was marked. It is determined that values of vertical stresses increase at dam bottom side correspond to the character of interaction between rock basis and dam section and are differ depending the section position in the range. The maximal increase is marked in key and near by sections. Lower values are obtained in coastal sections. Based on results of many years’ observations the assessment of accumulation the residual deformations of concrete massive was carried out. [ABSTRACT FROM AUTHOR]