高拱坝大体积混凝土自生体积变形回归分析——以溪洛渡水电站为例

Regression analysis of autogenous volume deformation of large volume concrete of high arch dam: case of Xiluodu Hydropower Station

在大型水电工程施工过程中,对混凝土的自生体积变形要求日趋严格。准确掌握混凝土自生体积变形,对结构防裂和改善内部应力状况有重要作用。以溪洛渡水电站为例,通过对坝段中布设的无应力计观测数据进行回归分析,得出了更接近实际值的自生体积变形,充分了解了坝体混凝土温度变形的实际线膨胀系数以及自生体积变化规律,通过与室内实验结果比较,发现回归分析结果与实际较为吻合。

In large- scale hydropower project,the requirements for concrete autogenous volume deformation are becoming increasingly stringent. The accurately mastering concrete autogenous volume deformation plays an important role in structure crack- resistance and can improve the stress condition. Taking Xiluodu Hydropower Station as a case,according to regression analysis of observation data derived from non- stress meter,the autogenous volume deformation value,that agreed well with measured value,was obtained,so we can fully understand the actual line expansion coefficient of concrete temperature deformation of the dam body and the autogenous volume variation principle. The comparison with the results of laboratory experiments reveals that the results of regression analysis are in good agreement with the reality.