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A 3D visualization method for identifying fabric characteristics during suffusion using transparent soil

Suffusion is a process by which fine particles move through the voids between coarse particles (inter-granular voids) by seepage flow. Thereby to identify the arrangement of coarse particles (coarse matrix), inter-granular voids and the spatial distribution of fine particles is a key issue for studying suffusion. Transparent soil is increasingly used to replace real soil in laboratory model tests for studying the internal particle movements and pore fluid flow in soil. This study established an experimental setup for scanning the transparent soil specimen during seepage by a moving laser and made an attempt to reconstruct the 3D digital mesostructural model of the specimen based on the images of the sequentially illuminated cross sections. An example test on a gap-graded soil was conducted to show the performance of the presented method. It demonstrated that the coarse matrix and inter-granular voids can be visualized and quantified at satisfactory precisions, moreover, the loss and redistribution of fines as well as the important phenomena such as deposition at pore bodies and clogging at pore throats can also be visualized and identified qualitatively.