江垭大坝碾压混凝土的渗透规律初探

Research of Permeability of Roller Compacted Concrete of Jiangya Dam

对湖南省江垭碾压混凝土大坝部分芯样渗透性的室内试验研究揭示了碾压混凝土渗透性的基本规律 .长时间、多状态下的碾压混凝土渗透性试验结果表明 :碾压混凝土渗透规律在较高水力梯度范围内仍服从线性达西定律 ;在恒定水头作用下 ,碾压混凝土的渗透具有时效自密性 ;在变水头作用下 ,当水力梯度达到某一上限后 ,碾压混凝土渗透存在偏离达西渗流的现象 .经过对试验资料的统计分析 ,提出了描述碾压混凝土渗透性的经验关系 。

Laboratory permeability tests of core samples of Jiangya roller compacted concrete dam (RCCD) located in Hunan province have been conducted.The basic permeability law of roller compacted concrete (RCC) is deeply explored. The test results show that the permeability of RCC obeys Darcy′s law under relatively high hydraulic gradient and the seepage through RCC reduces gradually with time.Under high hydraulic gradients,the permeability deviates from Darcy′s law when the hydraulic gradient reaches some upper limit.Based on statistic analysis of test data, an empirical formula describing the permeability of RCC is put forward.