土石混合体渗透性能的正交试验研究

Orthogonal tests on permeability of soil-rock-mixture

土石混合体作为土和石块的介质耦合体,具有非均质性、非连续性及试样的难以采集性等内在的独特的性质,从而给研究带来极大的困难。土石混合体属于典型的多孔介质,其渗透特性与颗粒的大小、孔隙比及颗粒形状关系密切。本文采用室内正交实验,利用自制的常水头渗透仪,研究了砾石含量、孔隙比和颗粒形状3个因素在不同水平下对土石混合体渗透系数的影响。通过正交试验确定了3种因素对土石混合体渗透系数的影响顺序及各因素的显著性水平。提出了土石混合体渗透系数计算公式,并通过试验结果验证了计算公式的正确性,为土石混合体渗透系数的理论计算提供了一个简明有用的计算工具。

As a coupling body of soils and rocks, soil-rock-mixture has the inherent unique properties of inhomogeneity, discontinuity and it is very difficult to gather samples to study its properties. Soil-rock-mixture is a typical porous medium, and its seepage is closely related to the particle-size, void ratio and particle shape. Based on the lab orthogonal tests, using self-manufactured constant head permeameter, the effect of gravel content, void ratio and particle shape on the coefficient of permeability of soil-rock-mixture was studied. By orthogonal tests, the influence of three factors on the coefficient of permeability of soil-rock-mixture, the significance of different factors was determined. A formula for calculating the coefficient of permeability of soil-rock-mixture was proposed and was verified by the experimental results, thus a concise and useful computational tool for the theoretical calculation of coefficient permeability of soil-rock-mixture was offered.