모니터링과 연계한 광물찌꺼기 적치장 사면의 안정성 해석
Slope Stability Analysis of Tailings Storage Facility Associated with Monitoring
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초록
광물찌꺼기 적치장은 유용광물을 추출한 후 남은 부산물들로 구성된 댐이다. 최근 해외에서 광물찌꺼기 적치장 파괴 사례가 보고되고 있어 국내 적치장에 대한 유지관리에 대한 중요성이 증가하고 있다. 본 연구에서는 강원도 삼척 제2연화광산 직내골 광물찌꺼기 적치사면에 대한 강우별 사면의 침투 및 안정해석을 위하여 2차원 유한차분법 기반 수치해석을 수행하였다. 3차원으로 복원된 광물찌꺼기 적치장으로부터 2차원 단면을 선정하였고, 직내골 광물찌꺼기 적치장의 적치방식을 고려하여 모델 구성층을 산정하였다. 본 연구는 투수계수별 침투해석, 강우강도별·지하수위별 민감도해석을 실시하여 적치장 내 간극수압의 예측과 적치장 사면의 안정성을 산출하였다. 현재 직내골 광물찌꺼기 적치장 사면에는 간극수압계, 지하수위계 및 변위계가 설치되어 모니터링을 지속적으로 실시하고 있으며, 이 결과는 광물찌꺼기 적치장 위험도 분석기준 제안시 활용될 수 있을 것으로 기대된다.
Abstract
A tailings storage facility is a dam composed of byproducts after extracting useful minerals. Recently, cases of tailings storage facility failures have been reported overseas, and there is an increasing importance of maintenance and management of domestic tailings storage facilities. In this research, numerical analysis of rainfall infiltration and slope stability was carried out using a two-dimensional (2D) finite difference code for the Jiknaegol tailings facility of the Yeonhwa Ⅱ Mine, Samcheok, Kangwon Province. A 2D cross-section was selected from a 3D reconstructed tailings storage facility, and model layers were decided considering the stacking method. Sensitivity analyses with respect to rainfall infiltration for permeabilities, rainfall intensities, and groundwater levels were performed predicting pore water pressure and slope stability of this tailings storage facility. Currently, piezometer, water level meter, inclinometer, and extensometer are installed on the slope of the Jiknaegol tailings storage facility for constant monitoring. The findings of this study are expected to be beneficial in estabilishing risk analysis criteria.
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