砂砾土孔隙特征对渗透系数的影响研究

通过改变细颗粒含量分析了孔隙率、不均匀系数以及曲率系数与渗透系数的相关关系，建立了砂砾土的渗透系数与三个孔隙特征参数的多元回归模型，探讨了砂砾土渗透系数与孔隙特征参数的相互关联。研究结果表明，砂砾土的渗透系数与三个孔隙特征参数具有综合相关关系，单个参数对渗透系数的影响具有随机性；40%的细粒含量可作为砂砾石渗透系数的界限含量，细粒含量高于40%后，渗透系数随细粒含量的减小而平缓增大，当细粒含量低于40%时，渗透系数随细粒含量的增大而迅速减小。采用相同骨架结构特征的土体，才能得到一致性的渗透系数变化规律。

The study of the gravel soil pore characteristics' impaction on permeability coefficient

The relation between the porosity,nonuniformity coefficient,curvature coefficient and permeability coefficient was analyzed by changing the fine particle content. The relationship between the gravel soil permeability coefficient and porosity feature parameters was discussed. The gravel soil permeability coefficient and three pore characteristic parameters of multivariate regression model were established. Research results show that gravel soil coefficient of permeability and the three pore characteristic parameters is comprehensive,the individual parameters' influence on the permeability coefficient is random; 40% of the fine particle content can be used as the boundaries of the coefficient of permeability of sand gravel content,when the fine particle content higher than 40%,the permeability coefficient decreases smoothly along with the increase of fine particle content; When the fine particle content is less than 40%,the permeability coefficient decreases rapidly along with the increase of fine particle content. Only using the same skeleton structure characteristics of the soil could meet the consistency change law of permeability coefficient.