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土的渗透性与其骨架构成的孔隙通道有本质联系。在假定粗粒土颗粒呈球形且粒径分布均匀变化的条件下,首先给出了同一粒组最密实状态的土粒体积和孔隙体积的确定方法;进而,依据最密实状态条件下各粒组土粒体积和骨架孔隙体积,从最小粒组到最大粒组,依次比较小于或等于某粒组土粒体积、骨架孔隙体积之和与大一级粒组的骨架孔隙体积,后者大于前者即出现架空空隙,提出了最大渗流单粒孔隙的确定方法。通过不同级配试样的泥浆渗透试验表明,随着最大渗流单粒孔隙的增大,依次出现入渗面形成泥皮和未形成泥皮两类孔隙特征粗粒土的泥浆渗透。在入渗面未形成泥皮条件下,随着最大渗流单粒孔隙的增大,泥浆渗流量逐渐增大;在形成泥皮的条件下,随着最大渗流单粒孔隙的增大,形成时间逐渐增长,泥浆穿透土样的渗径逐渐增大。验证了最大渗流单粒孔隙反映粗粒土渗透性的合理性。
The permeability of soil is intrinsically linked to the pore channel formed by its skeleton. Assuming that the coarse-grained soil particles are spherical and the particle size distribution changes uniformly, the method of determining the volume of the soil particles and the pore volume in the most compact state of the same particle group is given first. Then, according to the most compact state, The volume of soil particles and the pore volume of the skeleton, from the smallest grain group to the largest grain group, are less than or equal to the sum of the soil grain volume, the sum of the framework pore volumes and the framework pore volume of the first grain group, which is greater than the former Overhead clearance appears, and the method of determining the maximum percolation porosity is proposed. The mud penetration test of different gradation samples shows that with the increase of the maximum percolation pore size, the permeation of mud with two kinds of coarse-grained soils, ie infiltration surface formation and non-formation of mud layer, appears in turn. Under the conditions of no formation of mud skin on the infiltration surface, the seepage amount of mud increases with the increase of maximum percolation pore size. With the formation of mud skin, with the increase of the maximum percolation porosity, the formation time Gradually increasing, the permeability of mud penetrating soil samples gradually increased. It is verified that the maximum percolation porosity reflects the rationality of coarse grained soil permeability.