摘要
在寒区进行大体积混凝土结构施工容易在内外温差的作用下出现裂缝,加强表面保温是一种常见的温控防裂方法。采用三维有限元计算,得到新疆某导流墙在不同保温条件下的温度场,计算结果显示通过增大保温力度可有效控制混凝土的温降速率,可根据温降速率确定表面放热系数。此外,文章推导出表面放热系数与风速、保温层厚度与保温层的导热系数之间的计算公式,并给出三种材料常见保温材料在不同保温要求下所需的厚度,可供类似工程参考。
The construction of mass concrete structure in cold area is easy to crack under the effect of internal and external temperature difference.Strengthening surface insulation is a common method of temperature control and crack prevention.In this paper,three-dimensional finite element calculation is used to obtain the temperature field of a diversion wall in Xinjiang under different insulation conditions.The calculation results show that the temperature drop rate of concrete can be effectively controlled by increasing the insulation strength,and the surface heat release coefficient can be determined according to the temperature drop rate.In addition,this paper deduces the calculation formula between the surface heat release coefficient and the wind speed,the insulation layer thickness and the thermal conductivity of the insulation layer.And it gives the required thickness of three kinds of common insulation materials under different insulation requirements,which can provide reference for similar projects.
作者
胡正凯
于宙
杨炳勇
强晟
朱中原
Hu Zhengkai;Yu Zhou;Yang Bingyong;Qiang Sheng;Zhu Zhongyuan(Huadong Engineering Co.,Ltd,Hangzhou 311122,Zhejiang;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu;Bu-Er New Material Technology Co.,Ltd,Nantong 226541,Jiangsu)
出处
《陕西水利》
2022年第1期149-151,155,共4页
Shaanxi Water Resources
关键词
寒区
温控防裂
表面保温
昼夜温差
Cold area
temperature control and crack prevention
surface insulation
temperature difference between day and night
