The objective of this paper is to visualize the behavior of soil-reinforcement interaction using industrial X-ray CT scanner. Here, a new pull-out testing apparatus for the use in the system of X-ray CT scanner was developed and a series of pull-out tests was conducted for geogrid type of reinforcement. Then, the pull-out box was scanned at several steps of pull-out displacement. And a number of cross sectional images for the interaction behavior in each step were obtained. Three-dimensional images were also reconstructed by summing up all the images in each step. Here, the sheet type of the reinforcement was also examined in order to evaluate the effect of the reinforcement geometry on the soil behavior around the reinforcement. Based on those results, the change of the density in the soil around the reinforcement during pull-out displacement was observed and the effect of the shape of reinforcing material on that behavior was also discussed. Finally, the effectiveness of industrial X-ray CT-scanner to geotechnical engineering was confirmed based on those test results.
