邕宁闸坝混凝土施工温控方案研究

Temperature control scheme for the concrete construction of Yongning Sluice Dam

为了探究邕宁闸坝混凝土施工温控方案,以该工程12#溢流闸坝为研究对象,建立三维有限元模型进行仿真计算,分析混凝土在3种施工方案下的温度场和温度应力。研究表明:低温季节采用方案1进行施工时,施工过程中温度场与温度应力均满足规范要求;高温季节采用方案2进行施工时,施工过程中最高温度与最大温度应力值均不满足规范要求;高温季节采用方案3进行施工时,施工过程中最高温度与最大应力值均满足规范要求。建议低温季节浇筑时采用自然入仓的浇筑方式;高温季节浇筑时,应控制底板混凝土浇筑温度不超过14℃,闸墩混凝土浇筑温度不超过16℃,同时采取通水冷却措施。计算结果可为邕宁闸坝及类似工程施工方案设计提供参考。

In order to explore the temperature control scheme of Yongning Sluice Dam concrete construction,taking No.12 overflow section of the sluice dam as the research object,a 3 D finite element model is established to analyze the concrete temperature field and temperature stress under three construction schemes.The results show that when scheme 1 is adopted in low temperature season,the temperature field and temperature stress in the construction process can meet the specification requirements.When scheme 2 is adopted in high temperature season,the maximum temperature and maximum temperature stress in the construction process can not meet the specification requirements.However,when scheme 3 is adopted in high temperature season,the maximum temperature and maximum stress in the construction process can meet the specification requirements.It is suggested that the natural pouring method should be adopted in low temperature season.When pouring in high temperature season,the pouring temperature of bottom slab concrete should not exceed 14℃,and that of pier concrete should be no higher than 16℃,meanwhile,water cooling measures should be taken too.The calculation results can provide some reference for the construction scheme design of Yongning Sluice Dam and other similar projects.