土石混合体的渗透特性试验研究

Experimental Studies on the Permeability of Soil-Aggregate Mixtures

土石混合体的物质组成以砾石与砂土、粘土等为主,受宏观构造和微观结构复杂性的影响,其渗透性极为不均匀。采用自制大直径常水头渗透仪,针对5种不同级配的土石混合体,通过渗透试验探讨了粗粒含量、细粒含量、不均匀系数、平均粒径等对其渗透特性的影响规律,并分析了管涌破坏的影响因素。

Soil-aggregate mixtures are composed of gravel, sand, and clay soils. Their permeability is highly inhomogeneous due to the complexities and variations of their macro and micro structures. In this paper, constant-head permeability tests were performed by large diameter permeameters on soil-aggregate mixture samples with five （5） different gradations. The factors that potentially affect the permeability of the soil-aggregate mixtures are also discussed in this paper. These factors include： coarse as well as fine aggregate contents, coefficient of uniformity and mean grain size. Piping failure modes in the soil-aggre- gate mixtures are also analyzed.