Soft ground improvement is essential process for the use of reclamation sites. If the reclamation site is contaminated, the remediation works should be performed with the improvement of ground. The reactive drain method was newly suggested to achieve simultaneously both the soft ground improvement and the remediation of contaminated pore water in reclamation site. In this study, numerical analysis considering the effect of vertical sand layer and the length of impermeable barrier was conducted to achieve an optimum design of reactive drain pile.
Soft ground improvement is essential process for the use of reclamation sites. Conventional drain method for soft ground is for preventing the ground settlement upon the above-ground structure construction by enhancing the consolidation of ground to be stabilized in advance. When the soft ground is contaminated, remedial action should be implemented ahead of the drain. Or the pore water should be treated in the above-ground water treatment facility, which costs a lot and needs additional action to treat the contaminants remained in the drain materials like sand drains. Therefore, when the drain method is applied in the contaminated soft ground, the enhanced engineering method is needed to effectively treat the contaminants in the pore water without installing the additional facility while performing the drain of contaminated pore water in the soft ground. In this study, the reactive drain pile method was newly suggested to achieve simultaneously both the soft ground improvement and the remediation of contaminated pore water in reclamation site. As shown in Fig. 1, the reactive drain pile is a sand drain which has a reactive central core. The central core is a cylindrical column filled with highly permeable materials such as furnace slag or zeolite and it can clean up the contaminated pore water flowing through the column.