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조위변화를고려한 해상처분장 2열 연직차수공에서의 오염물질 이동특성 평가
채광석(Kwangseok Chae),오명학(Myounghak Oh) 한국연안방재학회 2020 한국연안방재학회지 Vol.7 No.3
Vertical hydraulic barrier is essential component to prevent leachate leakage in offshore containment facilities. Double steel pipe sheet pile is one of effectively used as vertical hydraulic barrier in Japanese offshore waste landfill sites. In this study, two-dimensional finite element analysis was performed to evaluate contaminant transport characteristics considering advection-dispersion-diffusion through double steel pipe sheet pile according to tidal fluctuation and different water level in landfill by using SEEP/W and CTRAN/W. Numerical analysis results indicate that water level in landfill should be maintain similar or lower compared with sea water level to prevent the leakage from landfill to sea. In addition, double steel pipe sheet pile was effective to prevent contaminant leakage to outside sea since filling zone between two barrier act as buffer zone for spreading contaminant.
수치해석을 통한 해상처분장 연직차수공 안정성 및 지반 내 흐름특성 평가
채광석(Kwangseok Chae),오명학(Myounghak Oh) 한국연안방재학회 2021 한국연안방재학회지 Vol.8 No.2
Preventing leakage and structural stability of vertical barrier at offshore containment facilities are very important. Two-dimensional numerical analysis were performed to evaluate seepage and flow characteristics regarding to different embedded depths and hydraulic permeability of vertical barrier. In addition, stress and displacement at corner of vertical barrier were evaluated by using 3-dimensional numerical analysis. The effluent flux in the case of vertical barrier with insufficient embedded depth was significantly increased by 200 ~ 240 times compared with the case of embedded barrier in low permeable clay layer. The effluent flux was increased by 4.5 and 45 times according to 10 and 100 times increase of hydraulic permeability of vertical barrier, respectively. The seepage and flow analysis results imply that the most important factor to prevent leakage is to embed the vertical barrier in low permeable layer. The 3-dimensional stress and displacement analysis results showed small displacement but large moment and shear stress at the corner of vertical barrier. Therefore, the stiffness and strength at the corner of vertical barrier compared with other parts should be increased to secure stability of vertical barrier at offshore disposal facilities.