水利水电技术2017，Vol.48Issue(7)：49-53,5.DOI:10.13928/j.cnki.wrahe.2017.07.008
基于均匀设计的高地温隧洞衬砌混凝土抗压强度影响规律研究
Study on the influence of high temperature tunnel lining concrete on its compressive strength based on uniform design
摘要
Abstract
In order to analyze the impact of high ground temperature tunnel on the concrete performance,high/low temperature humidity curing box is adopted for simulating the thermal and humid environment inside of tunnel under high ground temperature and carrying out the curing of the lining concrete,and then more comprehensive testing data are obtained with the testing method of the uniform design.Furthermore,the regression equations for different curing ages are got through the relevant regression analyses,from which the laws of the impacts from the factors,i.e.temperature,water-cement ratio and sand percentage,on the uniaxial compression strength of the lining concrete are summed up.The result shows that an optimal value for each of the temperature,the water-cement ratio and sand percentage can be found out through the regression equations (e.g.water-cement ratio is to be 0.42,sand percentage is to be 45％ and curing temperature is to be 57 ℃),and thus make the uniaxial compression strength of the lining concrete reach to its maximum value.Along with the rise of the curing temperature,both the water-cement ratio and the sand percentage corresponding to the maximum uniaxial compression strength of the lining concrete are somewhat increased;for instance,the water-cement ratio is to be 0.31 (the curing temperature of 55 ℃) and 0.52 (the curing temperature of 115 ℃),when the curing age is 28 d.Therefore,when the curing temperature is higher,both the water-cement ratio and the sand percentage must be appropriately increased as well.关键词
高地温/衬砌混凝土/均匀设计/回归方程Key words
high ground temperature/the lining concrete/uniform design/the regression equation分类
建筑与水利引用本文复制引用
宿辉,康率举,屈春来,李琦,杨家琦,刘翌晨..基于均匀设计的高地温隧洞衬砌混凝土抗压强度影响规律研究[J].水利水电技术,2017,48(7):49-53,5.基金项目
河北省高等学校科学技术研究项目(QN2015157) （QN2015157）
