지중에 설치된 반응성 라이너의 TPH 차단 효과에 관한 실험적 연구
Experimental Study on the Barrier Effect of Reactive Liner Installed Underground Against TPH
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초록
본 연구에서는 반응성 라이너의 TPH(Total Petroleum Hydrocarbons) 차단 효과를 평가하기 위하여, 지중의 TPH 유출을모사한 모형실험을 수행하였다. 모형실험은 지반 및 TPH 유출 위치를 고려하였고, 반응성 라이너의 차단 효과는 지하수유동에 의한 시간 경과에 따른 지반의 투수계수 변화로 평가하였다. 그 결과, TPH 유출 조건이 동일할 때, 세립토 함유여부에 관계없이 시간 경과에 따른 지반의 투수계수는 감소하였고, 세립토가 함유된 지반의 투수계수가 더욱 낮은 것을 확인하였다. 그러나 TPH 유출 후 지하수 유동 시간이 24시간일 때, 유출 위치가 라이너에 가깝고 모래지반인 경우에서만 TPH 반응에 의한 라이너의 불투수성 조건(10-6cm/s)이 명확하게 발현되었다. TPH 유출 거리가 라이너의 차단 효과에 미치는영향을 평가한 결과, 지반 조건에 따른 차이는 있지만, 라이너로부터 0.50D 이내에서 유출되는 경우만 24시간 내에 라이너의차단 효과를 기대할 수 있었다.
Abstract
This study described the results of a model experiment simulating TPH(Total Petroleum Hydrocarbon) spill in the ground to evaluate the TPH barrier effect of the reactive liner. The model experiment considered the ground and TPH spill location, and the barrier effect of the reactive liner was evaluated by the change in the ground permeability coefficient over time due to groundwater flow. The experiment results showed that the permeability coefficient of the ground decreased over time regardless of whether fine-grained soil was included, when the TPH spill conditions were the same. In addition, the permeability coefficient of the ground containing fine-grained soil was confirmed to be lower. However, the impermeability characteristic of the liner (10-6cm/s) due to the TPH reaction were clearly expressed only in sandy soils where the spill location was close to the liner, when the groundwater flow time after the TPH spill was 24 hours. As a result of evaluating the effect of TPH spill distance on the barrier effect of the liner, although there were differences depending on ground conditions, the blocking effect of the liner could be expected within 24 hours only when the leak occurred within 0.50D from the liner. There were differences depending on the ground conditions, but the barrier effect of the liner could be expected within 24 hours only under TPH spill condition within 0.50D from the liner.
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