Abstract
Light Nonaqueous Phase Liquid (LNAPL) contamination of subsoil is a serious problem because it affects human health and the environment. This paper describes centrifuge modeling tests of LNAPL migration in a sandy soil layer that were focused on a soil-cement barrier as the containment to protect the groundwater from contamination. Two centrifuge modeling tests were performed in this study for the following two scenarios: groundwater flow and no groundwater flow conditions. Liquid paraffin oil was used to represent LNAPL, and it was infiltrated into the partially saturated sand deposit. The centrifuge tests were performed at 30 g, and pore pressure sensors and camera recordings were used to evaluate the model behavior. The results show that groundwater flow accelerates LNAPL migration in sandy soil. In addition, LNAPL was found to migrate below the groundwater level, and the soilcement barrier was found to serve effectively for containment.
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