ABSTRACT
Geomembranes used at the bottom of landfill are aged and damaged with the traffic loads of dump tracks during dumping waste and thermal stress with sum beam during the process of installing geomembranes (Rowe 1998). The damage factors would cause holes and crack in geomembrane and finally, leachate in the landfill starts to leak into the ground. Leakage volume of leachate would be affected with defect configuration and ground properties underneath geomembrane sheet. In order to predict the leakage volume of leachate in the ground, many researchers proposed the two dimensional (2-D) numerical model in the several boundary conditions (Giroud et al. 1989 and TouzeFoltz et al. 2001). In fact, it is difficult to observe the inner behavior of soil materials without any destruction. The industrial X-ray CT scanner is a powerful tool to distinguish the density distribution in the engineering materials such as soils, rocks and concrete (Otani et al. 2000, Otani and Obara 2003 and Desrues et al. 2006). X-EARTH Center newly established in Kumamoto University since 2008 possesses the industrial one and has kept contributing to visualize the inner condition of soil and rock materials due to loading and permeating fluid.
