Impact of closure temperature selection to 3D thermal stress field of concrete arch dam- applying to SU PAN 1 dam in Vietnam

Abstract

One of the most important issues in the design and construction of concrete arch dam is the selection of appropriate temperature to spray the mortar in order to fill the slots into seamless structures or also known as arch closure temperature. As the temperature in the dam body changes over time, the arch closure temperature also changes over time. When the temperature of the dam points is different from the arch closure temperature, it may cause the movement of the dam to upstream or downstream, causing tensile stress on the upstream or downstream of the dam. Therefore, the arch closure temperature selection has an important decisive significance for the stress field in the dam body. From the practical design of Su Pan concrete gravity-arch dam 1, the selection of appropriate temperature of arch closure for this project in accordance with the current standard of Vietnam is complete. With the actual working conditions of the project as provided, a numerical model is carried on in Ansys. The numerical result shows that the appropriate temperature for the drilling of the deformed slot is 20°C.