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结合黏性土的压缩特性和Kozeny-Carman方程,考虑离心加速度变化对土体固有渗透率的影响,推导了渗流速度和离心加速度的关系式。参考常规渗流试验装置的构造,并结合离心模型试验的特点,研制了常水头离心渗流试验装置。应用该装置针对糯扎渡高心墙堆石坝的心墙黏土,分别进行了常规渗流试验和10g,20g,30g常水头离心渗流试验。试验结果表明:Ng(N倍重力加速度)和1g条件下渗透系数的比值随离心加速度的增大逐渐减小,但变化范围不大,接近于N。研究结果对于深入认识离心模型试验中的渗流相似准则具有重要意义。
Considering the compressibility of clay and the Kozeny-Carman equation, the influence of centrifugal acceleration on the inherent permeability of soil is considered, and the relation between seepage velocity and centrifugal acceleration is deduced. Reference to the structure of conventional seepage test device, combined with the characteristics of centrifugal model test, developed a constant head centrifugal seepage test device. Applying the device to the core wall clay of Nuozhadu high core rockfill dam, the conventional seepage test and the centrifugal seepage test of 10g, 20g and 30g constant head were carried out respectively. The experimental results show that the ratio of Ng (N times gravitational acceleration) and the permeability coefficient under 1g condition decreases gradually with the increase of centrifugal acceleration, but the range of variation is not large and close to N. The results of this study are of great significance for further understanding of the seepage similarity criterion in a centrifuge model test.