长江科学院院报2016，Vol.33Issue(6)：124-128,5.DOI:10.11988/ckyyb.20140912
某水电站大坝裂缝化灌混凝土芯样抗剪试验研究
Shear Tests on the Concrete Core Samples for the Chemical Grouting of Dam Cracks of a Hydropower Project
李伟 1沈蓉 1赵云川 1龚维群1
作者信息
- 1. 中国电建集团 昆明勘测设计研究院有限公司，昆明 650033
- 折叠
摘要
Abstract
Temperature crack in the pouring process of mass concrete of concrete arch dam and gravity dam could be a hidden troubles that affects the safety of the dam, especially reduces the tensile strength and shear mechanical properties of concrete dam, and also affects the long⁃term stability and the service life of the dam. During the pou⁃ring of mass concrete of a hydropower station, part of the dam was affected by temperature and cracks penetrated through. By using the crack grouting material for the hydropower station dam, we carried out indoor tests and com⁃pared the test results. The indoor tests include:shear test on the original concrete core sample with no crack from the dam, shear test on cube concrete samples with cracks ( made by splitting) and concrete core samples after sim⁃ulation chemical grouting, and shear test on concrete core samples with cracks fully bonded after grouting. Results show that after chemical grouting treatment on the cracks, the shear parameter f ′ reaches the 83% of the original concrete, and c′s the 68%of the original concrete. The result of indoor chemical grouting simulation is better, with f′equaling the level of original concrete, and c′reaching above 85% of the original concrete. Chemical grouting is an effective measure to treat dam cracks and improve the shear strength and the impermeability of concrete. The re⁃search results provide reference for reasonable values of mechanical parameters of concrete after chemical grouting.关键词
大体积混凝土/温度裂缝/抗剪试验/模拟化灌/力学性能Key words
mass concrete/temperature crack/shear tests/simulation of chemical grouting/mechanical property分类
建筑与水利引用本文复制引用
李伟,沈蓉,赵云川,龚维群..某水电站大坝裂缝化灌混凝土芯样抗剪试验研究[J].长江科学院院报,2016,33(6):124-128,5.
