Abstract

The Sabigawa Lower Dam is a concrete gravity dam being constructed by Tokyo Electric Power Company, as the lower regulating reservoir for the Sabigawa Pumped Storage Power Station.
The thermal cracking of dam concrete has been usually a major design concern and various methods have been used to control the concrete temperature.
At the Sabigawa Lower Dam, with two dimensional FEM analysis, we simulated thermal and stress behavior of the dam concrete, and determined the control value for highest allowable temperature of the dam concrete. Further to determine the placing temperature of the concrete, we conducted series of one dimensional FEM analysis, where the precooling effect of mixing ice and chilled water were incorporated into numerical model.
With thus determined procedure, we controled the placing temperature and successfully kept the temperature of the dam concrete below the highest allowable temperature.