Analysis and prediction research on the causes of temperature rise in the later stage of ultra-high and low heat concrete arch dams

Abstract

The phenomenon of temperature rise is common in ultra-high arch dams. In order to gain a deeper understanding of the causes and processes of temperature rise, this article takes a certain ultra-high arch dam as an example to analyze temperature monitoring data. Through a combination of simulation calculation and regression analysis, a calculation model for the later temperature rise of the arch dam is constructed to conduct in-depth research on the problem of temperature rise after the arch dam is sealed. Results has shown that:(1) The temperature rise after arch dam sealing is influenced by two factors: the internal transmission of external temperature and the hydration heat of concrete in the dam body. However, the speed of internal transmission of external temperature is slow, and the impact on the temperature rise inside the dam body is relatively small. Moreover, the measured maximum temperature of the dam body is higher than the stable temperature. Therefore, the main reason for the temperature rise after arch dam sealing is the hydration heat generated by concrete;(2) It takes 3~6 years for a certain ultra-high arch dam to reach its maximum temperature, and about 20 years to reach a stable temperature;(3) The hydration heat mainly affects the temperature rise inside the dam body in the early stage after arch sealing, and has no effect on the final stable temperature field of the dam body.

Keywords

low-heat concrete / ultra-high arch dam / temperature rise / simulation analysis / adiabatic temperature rise