Inversion analysis and optimization of temperature control measures for the concrete first placement layer of high arch dams in high altitude regions
[Objective]The pouring of concrete in the first layer of each dam section often uses a large amount of three graded con-crete,which has a high insulation temperature rise.At the same time,this area is greatly constrained by the foundation,and in the event of temperature control measures failure,the temperature peak is prone to exceed the design allowable value,resultsing in sig-nificant stress.To ensure the safety of the dam,it is necessary to adopt reasonable secondary cooling measures to control the tem-perature stress of the dam.[Methods]This paper analyzes the reasons for the excessive temperature and stress formation of the con-crete in the first layer of the dam in high cold and high altitude areas,and analyzes the maximum stress and safety factor of the dam after the temperature exceeds the standard.On this basis,optimization analysis is conducted on the second phase cooling.Taking the Yebatan Project as an example,the measures include setting up the first and second simultaneous-cooling areas for simultaneous cooling,temporarily controlling the temperature of the 16-1 warehouse to 12.50 ℃,keeping the temperature of the first layer 2.00 ℃ higher than the other layers in the first and second simultaneous-cooling areas,and setting the target temperature for the second phase cooling of the first layer concrete to 11.00 ℃(the upper limit value specified in the design).[Results]According to the calculation result,reasonable temperature control measures can increase the safety factor of the dam body from 1.25(in the most unfavorable situation)to 1.63.[Conclusion]This measure can effectively avoid cracks in the concrete of the first warehouse of the dam,and can also provide temperature control measures for similar situations in similar projects.
concrete damconcrete excessive temperaturetemperature controloptimization of temperature control measuresdeformationconcrete
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