Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
권호 표지

Environmental Assessment of Heavy Metal Leaching Potentials from Grouting

그라우팅으로 인한 주변 지하수-토양 환경으로의 중금속 용출가능성 평가

Jeon, Hyo-Taek;Jeon, Hae-Pyo;Bang, Gi-Mun;Kim, Gwang-Hui
전효택;전해표;방기문;김광희

  • Published : 20060000
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Abstract

Grouting is an injection of appropriate materials under pressure in the area of joint, cavities and pores of the ground. It has been widely used not only to block the groundwater in excavation work but also to reinforce the stiffness of the ground. Recently, the studies of grouting impacts on environmental contamination of ground have been on the increase. The purpose of this study is to estimate the impacts of heavy metals in grouting materials on environment by selecting the grouting operations which have been widely used in Korea. Chromium, Fe, Ni, Cd and Pb were detected in grouting materials, the concentrations of Ni and Cd, however, were negligible. Among the heavy metals, the concentration of Fe was the highest in all grouting materials whereas the highest content of Pb was found in the OPC(Ordinary Portland Cement). In the case of leaching test result on simulated grouting specimens, heavy metals were detected significantly at condition of under pH 4 while Pb and Fe were not leached at under pH 7 and without pH control. As the surface area of specimens increased, amounts of leached heavy metals also were risen. But the concentrations of heavy metals were reached maximum and sustained constant value after quite a few time. According to weathering test, it was shown that heavy metals which had not been leached at normal condition test were leached in test with weathering. From this point, it is apparent that weathering was highly correlated with the leaching of heavy metals in grouting materials. It is evident that the leaching of heavy metals from grouting materials was significant in acidic condition, such as the condition of the abandoned or closed mine areas.

그라우팅은 건설공사에서 지반의 갈라진 틈이나 공동, 공극 등에 적절한 충전재를 압력을 이용하여 주입하는 것으로, 굴착공사 시 누수방지와 불안정한 지반의 보강을 위하여 광범위하게 사용되고 있다. 본 연구에서는 국내에서 널리 이용되고 있는 그라우팅 물질 내 중금속에 의한 주변 토양-지하수에 미치는 오염영향을 평가하고자 하였다. 그라우트 재료 내 포함되어 있는 중금속은 Cr, Fe, Ni, Cd, Pb 등이 있으나 Ni와 Cd는 함량이 극히 작아 용출실험 대상에서 제외하였다. 중금속 중 양적으로는 Fe가 가장 많이 함유되어 있으며, OPC(Ordinary Portland Cement)의 경우는 Pb 함량이 높게 나타났다. 모의 시편에 대한 용출실험결과는 PH<4 인 조건에서 모든 시료중 중금속 용출량이 높았으며, Cr을 제외한 Pb, Fe 등은 PH<7 인 조건과 증류수 용출실험 상태에서는 거의 용출되지 않았다. 그라우팅 시편의 표면적을 달리한 용출시험을 통해 시편의 표면적이 중금속의 초기용출속도에 영향을 미치나 중금속의 총용출량에는 영향을 미치지 못하는 것으로 나타났다. 인공풍화시험을 통하여 용출실험을 수행한 결과 일반 실험조건에서는 용출되지 않던 중금속이 용출되는 것이 확인되었다. 이는 풍화가 그라우팅 재료내 중금속의 용출에 영향을 주는 것으로 판단되며 특히 지반환경 조건이 폐광산 지역과 같이 산성인 곳에서는 그라우트재료에 의한 중금속 오염의 우려가 높다.

Keywords

References

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