Study on a long-term temperature stress of a low-heat cement concrete high arch dam

Abstract

The structure of high arch dams is complex and the overall stress level is high. Therefore, the temperature field and stress field of high arch dams have always been the focus of related research. This article starts with the monitoring data, combined with simulation calculation, to study the long-term temperature stress change law of the high arch dam with low-heat cement concrete in the whole dam. After calculation and analysis, the following conclusions are drawn: (1) The use of low-heat cement concrete significantly reduces the difficulty of temperature control, and the maximum temperature of the entire dam is controlled within 27°C; (2) The internal temperature of the low-heat cement concrete arch dam is relatively stable after the arch is sealed. 2-5 years after the arch is closed, the external environment temperature will increase periodically; (3) With the passage of time, the overall tensile stress of the arch dam gradually decreases, and the concrete tensile stress of the main body of the dam is within the range of the 2.0 safety curve during the whole life cycle. There is a certain safety margin. The selection of the new low-heat cement concrete can effectively reduce the difficulty of early maximum temperature control in the project, and the residual hydration heat release effect in the later period is weak. The long-term tensile stress of the concrete in the project is in a safer position, which can make the construction more difficult. The selection of materials for arch dam projects can be used for reference.