寒冷地区特高拱坝混凝土最高温度控制研究:以东庄拱坝为例OA北大核心CSTPCD

The Dongzhuang Extra High Arch Dam is located in the cold regions of the northern China,and there is a significant difference between it and other existing ultra high arch dams over 200 meters in China,which are mainly located in the mild cli-mate areas of the southwest,making concrete temperature control difficult.In order to ensure the safety of engineering construc-tion and meet the requirements of progress and quality,[Methods]a finite element simulation analysis model is established based on the temperature characteristics of the on-site environment during the construction period of Dongzhuang Dam in different sea-sons of summer and winter.The Construction process simulation technology is used to study the temperature stress of concrete in Dongzhuang Arch Dam under different cooling ages and foundation temperature differences,Compare and analyze the on-site mo-nitoring analysis result with the simulation analysis rules,and propose corresponding suggestions for maximum temperature con-trol.[Results]The result show that in order to ensure the stress safety of the arch dam,the maximum temperature should not ex-ceed 26 ℃.To ensure the groutability of the transverse joints of the arch dam,the maximum temperature should not be lower than 20 ℃.The relationship between joint opening and temperature control crack prevention needs to be coordinated.As the temperature difference increases,the temperature stress increases,and the width of the joint increases.The pressure of the tem-perature control measures increases,while the temperature difference decreases.The stress decreases,and the width of the joint decreases.However,there is a risk that the joint opening does not meet the requirements,especially in cold regions where the highest temperature during winter construction is low,which ultimately leads to a smaller joint opening and the inability to achieve joint grouting work.[Conclusion]Taking into account two factors comprehensively,the upper and lower limit values for the maximum temperature control of the dam are given.The control of the highest temperature within the interval can meet the re-quirements of joint grouting and crack prevention.The calculation result in this article can provide technical support for adjusting the temperature control scheme of joint grouting during the construction process of arch dams.