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Research articles

ScienceAsia 39(2013): 527-534 |doi: 10.2306/scienceasia1513-1874.2013.39.527

Centrifuge simulation of LNAPL transportation in sand deposits with containment under flow and no-flow conditions

Chusak Kererata,*, Suttisak Soralumpb, Inthuorn Sasanakulc

ABSTRACT:     Light nonaqueous phase liquid (LNAPL) contamination of subsoil is a serious problem affecting human health and disturbing the environment. This paper describes centrifuge tests of LNAPL migration in a sandy soil layer that were focused on a soil-cement barrier as a containment to protect the groundwater from contamination. Two centrifuge 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 30g, and pore pressure sensors and camera recordings were used to evaluate the model behaviour. 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 soil-cement barrier was found to serve effectively for containment.

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a Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin (RMUTR), Prachuap Khiri Khan 77110 Thailand
b Department of Civil Engineering, Faculty of Engineering, Kasetsart University, Jatujak, Bangkok 10900 Thailand
c Centre of Earthquake Engineering Simulation, Geotechnical Centrifuge Research Centre, Rensselaer Polytechnic Institute, Troy, New York 12180 USA

* Corresponding author, E-mail: Chusak.K@rmutr.ac.th

Received 19 Oct 2012, Accepted 21 Jun 2013