粉煤灰的透水性及其各向异性

Permeability and its Anisotropy of Fly Ash

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，灰的渗进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．

Laboratory permeability tests on fly ash are thoroughly conducted to investigate the effect oftesting apparatus,test procedure and method of specimen preparation on the measured coefficient ofpermeability and its anisotropy. Test result show that the coefficient of permeability of fly ash is not very sensitive to thetesting apparatus,test procedure and even specimen density. However,its anisotropy depends in a large extenton the method of specimen preparation or the structure of the specimen. The lower the coefficient ofpermeability,the more the number of layer consisting of the specimen,then the higher the permeability anisotropy.