豊浦砂の高解像度X線CT画像を利用した三次元多孔質体モデルの構築およびSPHによる透水シミュレーション

抄録

Recent ground pollution is a pressing problem and which has been widely studied in the field of geotechnical and geological engineerings. Although a porous media flow plays an important role from the aspect of ground pollution and it is governed advection-dispersion equation (ADE), however, the solution of ADE can not discribe the cardinality change observed in a field study. In order to circumstantially comprehend the essence of above fluid flow through the porous medium, a microscopic approach is employed. We constructed an accurate simulation model by means of image-based modeling technique with a series of high-resolution X-ray CT images of Toyoura sand acquired at SPring-8. Then, a series of porous media flow simulations using the SPH (Smoothed Particle Hydrodynamics) was performed to obtain the distribution of pore fluid velocity vectors and macroscopic permeability coefficient by averaging the velocity of SPH particles inside the model. The calculated macroscopic permeability coefficient conformed closely to the canonical value measured in a permeability test and the estimated velocity distribution was compared with some experimental result and discussed its properties.