考虑击实作用的非均质多孔介质渗流特征研究

Seepage Characteristics of A Non-Homogeneous Porous Media Considering Compaction Effect

土体有着极其复杂的内部孔隙结构,属于典型的多孔介质。渗透率作为岩土体重要的物性之一,相关的影响因素多有研究,但非均质性相对较少。为了探讨非均质性对多孔介质渗透特征的影响,通过数值模拟软件,结合实际试验情况,建立了考虑击实作用的不同二维多孔介质渗流模型,研究了土颗粒不同的分布模式对渗透规律的影响。结果表明,土颗粒非均匀分布对渗透特征有明显的影响,当土颗粒集中分布阻碍流体流动时,渗透率下降明显,而当非均质性并未实际改变渗流通道大小时,影响较小。

A typical soil material has an extremely complex internal pore structure and is a typical porous medium.The coefficient of permeability,as one of the important physical properties of geotechnical materials,was evaluated with various potential influencing factors,but the effect of inhomogeneity on the coefficient of permeability is relatively rare evaluated.In order to explore the effect of this non-homogeneity on the permeability characteristics of the porous media,this paper establishes different two-dimensional porous media seepage models that considering the compaction effect through a numerical simulation software.The numerical study results are combined with the actual test results,and therefore,investigates the influence of different distribution patterns of soil particles on the permeability values.The results show that the non-uniform distribution of the soil particles has an obvious influence on the seepage characteristics.When the concentrated distribution of soil particles impedes fluid flow,the permeability decreases significantly.Further,when the non-homogeneity does not actually change the seepage channel size,the effect is smaller.