砂土渗透系数的细粒效应与其状态参数关联性

利用常规渗透仪进行了不同细粒含量砂土的渗透性能试验，通过引入粒间状态参量概念，探讨砂土渗透系数的细粒效应及其与表征砂土各种状态参数的相互关联性。发现砂土渗透系数总体上随细粒含量增加而减小，当细粒含量小于5%时影响较小；细粒含量在5%～10%时，渗透系数随细粒含量增加而急剧减小；而当细粒含量大于25%后，砂土的渗透系数则基本趋向相对稳定值。基于5种不同表征状态参数的拟合分析，表明采用现有常用的经验模型尚难以简便、有效地预测各种细粒含量砂土的渗透系数，而利用粉粒间孔隙比则能更好地反映细粒含量对渗透系数的影响，且其与渗透系数在半对数坐标内基本呈现线性关系，说明粒间状态参量适宜用来描述砂土渗透系数的细粒效应

Effect of fines content on permeability coefficient of sand and its correlation with state parameters

The permeability test of sand with different contents of fines is performed by conventional permeameter,the effect of fines content on permeability coefficient of sand and its correlation with various characterized state parameters are discussed,in which the concept of inter-particle state parameter is employed.It is found that the permeability coefficient of silty sand decreases with the fines content increasing,when the fines content is less than 5%,the effect is very small,while in the range of 5%-10%,th...