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首先提出渗透系数场为非高斯分布、高方差条件下三维非均质多孔介质的渗透系数上升尺度的经验计算公式,所考虑的因素包括砂质包裹体的体积百分含量、空间统计几何尺寸、空间连通性以及各水文地质相渗透系数的算术平均值.系统对比结果表明,该经验公式优于常用的传统计算方法.然后提出三维非均质多孔介质的孔隙度必须提升尺度的概念.这是因为在多孔介质含水系统中,污染物趋向于沿着高渗透性物质构成的三维优势通道快速运移,其有效运移速度与经提升尺度获得的单一渗流速度差别很大,迫使我们对孔隙度进行尺度提升.含水系统中高渗透性物质含量的变化引起孔隙度尺度提升特征的非线性变化,其上升尺度值介于0.004~1.5之间.当高渗透性物质含量低于30%时,孔隙度的尺度提升对于正确求解污染物运移尤为重要.
Firstly, the empirical formula for calculating the permeability coefficient of three-dimensional heterogeneous porous media with non-Gaussian distribution and high variance is proposed. The factors considered include volumetric content of sandy inclusion, spatial statistical geometric size, Space connectivity and the arithmetic average of the permeability coefficient of each hydrogeological phase.Comparison of the results of the system shows that the empirical formula is superior to the commonly used traditional calculation methods.Then the concept that the porosity of three-dimensional heterogeneous porous media must be increased is proposed Because in porous media aqueous systems, pollutants tend to migrate rapidly along the three-dimensional predominant channel of highly permeable material, and their effective migration rates differ greatly from the single seepage velocities obtained by scaling up, forcing us to estimate the porosity Scale changes.The variation of high permeability material in aquifer system caused the non-linear change of pore scale elevation characteristics, with the rising scale value ranging from 0.004 to 1.5. When the content of high permeability material is less than 30%, the porosity The scale improvement is particularly important for correct solution of pollutant transport.