Calculations of the stress-strain state of the conjugation of the concrete and rock-fill dams of the Boguchanskaya HPP

Abstract

The conjugation interface of the concrete dam with the rock-fill dam is the most critical section of the pressure front of the Boguchanskaya HPP. The most important feature of the Boguchanskaya HPP is the presence of an impervious element – an asphalt concrete diaphragm, which is made using a special technology from a cast hydraulic asphalt concrete mixture laid in a heated state. The safety of the pressure front of the hydroelectric complex depends on the condition of the junction of the asphalt concrete diaphragm with section No. 34 of the concrete dam (including the condition of the contact joint between them). After the beginning of filling the reservoir in 2012, the opening of the contact joint between the ABD and section No. 34 of the concrete dam was recorded, and the settlement of the ABD relative to section No. 34 of the concrete dam was also noted. At present, the opening of the contact seam and the settlement cannot be called stabilized. The aim of the research is to determine the computational stress-strain state of the conjugation between the concrete and rock-fill dams of the Boguchanskaya HPP. On the basis of a spatial finite element model of the conjunction of a concrete dam with a rock-fill dam, taking into account the data of field observations and deviations from the design prerequisites, calculations of the stress-strain state were performed. The results of the calculations showed that the controlled values do not exceed the criterion values.