粗粒土孔隙特征及其对泥浆渗透性的影响  

Pore characteristics of coarse grained soil and their effect on slurry permeability

作　　者：邵生俊[1,2] 李建军[1,2] 杨扶银[1,2] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]陕西省黄土力学与工程重点实验室,陕西西安710048

出　　处：《岩土工程学报》2009年第1期59-65,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(56779054);陕西省黄土力学与工程重点实验室基金项目

摘　　要：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 essential characteristics of soil permeability are that the seepage channels are made up of soil porosity. Based on the assumption that the particles of coarse grained soils are spherical and the distribution of soil particles is well-proportioned for every fraction, the computing methods for soil particle volume and porosity volume are advised for the same fraction of soils. The soil particle volume and porosity volume of different groups of grains are compared in order from the groups of the minimum grains to those of the maximum grains. If the sum of the particle volume and porosity volume of group is smaller than the porosity volume of the larger grain group, the former is not full of the porosity of the latter. So the estimation method for the maximum grain volume of seepage is proposed in the mean time. Along with the increase of the maximum grain volume of seepage, three states of slurry permeability can be observed： the slurry does not penetrate the samples and the slurry skin is formed; the slurry penetrates the samples and the slurry skin is formed; and the slurry penetrates the samples and the slurry skin is not formed. Finally, it has been validated that a new parameter, pore volume of a single particle under maximum seepage, can reflect the permeability of coarse grained soil.

关 键 词：粗粒土 最大渗流单粒孔隙 泥浆渗透试验 泥浆渗透性 

分 类 号：TU441[建筑科学—岩土工程]