蔡　红　温彦锋　边京红

【摘　要】　通过室内对粉煤灰透水性和各向异性的研究，了解试验方法对渗透系数及各向异性的影响程度，以更好地判定灰坝渗流计算成果的可靠性。研究表明，灰的渗透各向异性主要取决于与试样制备方法有关的结构性。对于具有同样结构的粉煤灰，渗透系数愈小，分层愈多，则渗透各向异性愈大。
【关键词】　粉煤灰　渗透　各向异性　结构性

Permeability and Its Anisotropy of Fly Ash
Cai Hong　　Wen Yanfeng　　Bian Jinghong
(China Institute of Water Resources and Hydropower,Beijing,100044)

　　Abstract: Laboratory permeability tests on fly ash are thorough ly conducted to investigate the effect of testing apparatus,test procedure and m ethod of specimen preparation on the measured coefficient of permeability and it s anisotropy.Test result show that the coefficient of permeability of fly ash is not very sensitive to the testing apparatus,test procedure and even specimen de nsity.However,its anisotropy depends in a large extent on the method of specimen preparation or the structure of the specimen.The lower the coefficient of perme ability,the more the number of layer consisting of the specimen,then the higher the permeability anisotropy.
　　Key words: fly ash,permeability,anisotropy,structure