内蒙古地区大体积混凝土挡墙施工温控分析
Temperature control analysis of mass concrete retaining wall construction in Inner Mongolia region
刘卫然 1吴昊天 2韩建田 3方斌 4于海丰 1高任清3
作者信息
- 1. 河北科技大学建筑工程学院,河北 石家庄 050018;河北省岩土与结构体系防灾减灾技术创新中心(筹),河北 石家庄 050018;智能低碳装配式建筑技术研究中心,河北 石家庄 050018
- 2. 河北科技大学建筑工程学院,河北 石家庄 050018
- 3. 河北省第四建筑工程有限公司,河北 石家庄 050051
- 4. 河北省绿色建筑推广与建设工程标准编制中心,河北 石家庄 050011
- 折叠
摘要
为降低多风干旱地区大体积混凝土挡墙早期开裂风险,确保其整体施工质量,以内蒙古某焦化厂煤堆取作业厂房混凝土挡墙为例,使用有限元方法,针对其有无布置冷水管,挡墙浇筑长度、高度和厚度进行参数化分析,得到混凝土浇筑后的温度场和应力场,并开展现场温度监测.结果表明:布置冷水管可以降低混凝土挡墙内部温度及里表温差;浇筑长度小于30 m时,收缩应力随浇筑长度增加而增大,大于30 m时,收缩应力无明显变化;浇筑高度超过4 m或墙体厚度超过1.5 m时,收缩应力值趋近于抗拉强度,开裂风险也随之增加;现场温度监测发现,冷水管作用下混凝土内部最大降温6.6℃,最大里表温差降低4.7℃.有限元模拟结果与实际监测结果相吻合.研究成果可为多风干旱地区的混凝土挡墙设计提供参考.
Abstract
To reduce the early cracking risk in mass concrete retaining walls in windy and arid areas and ensure the overall construction quality,the concrete retaining wall for coal collection operation of a coking plant in Inner Mongolia was taken as an example to carry out a parametic analysis on the parameters(including the installation of cold water piper,the length,height and thickness of retaining wall)by utilizing the finite element method.In this way,the temperature and stress fields after pouring were determined.Furthermore,the on-site temperature monitoring was performed as well.The results indicate that installing cold water pipes can effectively reduce internal temperatures and temperature differentials within the concrete retaining wall.Shrinkage stress increases when the length is less than 30 m,and remains relatively stable when it is greater than 30 m.Besides,when the height exceeds 4 m or the thickness exceeds 1.5 m,the shrinkage stress is close to the tensile strength,and the risk of cracking also increases accordingly.On site temperature monitoring indicates that the maximum temperature drop inside the concrete under the action of the cold water pipe is 6.6℃and the maximum temperature differential on the surface decreases by 4.7℃.The finite element simulation results are consistent with the actual monitoring results.The research results can provide reference for the design of the concrete retaining walls in windy and arid areas.
关键词
墙体工程/大体积混凝土/水化热/收缩应力/有限元Key words
wall engineering/mass concrete/hydration heat/shrinkage stress/finite element引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据