Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Analysis of Slope Stability of Masonry Retaining Walls in Quarry

석산개발 지역 퇴적장 석축사면의 안정성 해석

  • Ma, Ho-Seop (Department of Forest Science, Gyeongsang National University (Institute of Agriculture and Life Science)) ;
  • Lee, Sung-Jae (Seoul National University Forest)
  • 마호섭 (경상대학교 환경산림과학부(농업생명과학연구원)) ;
  • 이성재 (서울대학교 학술림)
  • Received : 2018.07.04
  • Accepted : 2018.10.26
  • Published : 2018.12.31
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Abstract

The slope stabilization analysis was performed by conducting survey and selecting the representative section in order to improve slope composition and management technology of masonry embankments in the quarry area, The mean slope of the masonry retain wall (A, B, C, D, E, F) was $38.5^{\circ}$, although the steep slope of the lowest slope (A) as $59^{\circ}$. The horizontal distance of the masonry embankments is 66.2 m and the slope height is 48.3 m. However, the inclination of the masonry embankments is relatively steep and visually unstable. The slope stability analysis for the slope stability analysis was taken into account during the drying and saturation. The slope stability analysis during saturation was performed by modeling the fully saturated slope. The strength constants of the ground were divided into two groups. The safety factor for dry period was 1.850 and the safety factor for rainy season was 1.333. The safety rate of dry period and rainy season was above 1.5 and 1.2. However, the weathered granite on the upper part of the masonry embankments at the time of heavy rainfall is considered to have a high risk of slope erosion and collapse. Therefore, it is considered necessary to take measures for stabilization through appropriate maintenance such as drainage installation.

석산개발 지역 퇴적장 석축사면의 사면 조성 및 관리기술 증진을 위하여 현황측량을 실시하고, 대표단면을 선정하여 사면의 안정성 해석을 수행한 결과를 요약하면 다음과 같다. 사면안정 해석을 위하여 선정한 대표단면의 퇴적장 최하단부 사면(A) 경사는 $59^{\circ}$로서 급경사를 이루고 있으나, 전체 퇴적장 사면(A, B, C, D, E, F)의 평균경사는 $38.5^{\circ}$이었다. 퇴적장 사면의 수평거리는 총 66.2 m, 사면높이는 48.3 m이지만 퇴적장 석축사면의 경사는 비교적 급하며, 시각적으로도 불안정해 보인다. 사면안정 해석에는 건조시와 포화시를 고려하였으며 포화시의 사면안정 해석은 대상사면이 완전히 포화된 상태를 모델링하여 수행하였다. 지반의 강도정수는 석축과 배면지반으로 구분하고 안전성을 검토하였다. 건기시 안전율은 1.850, 우기시 안전율은 1.333으로 나타나 건기시 및 우기시의 안전율 1.5와 1.2를 상회하여 사면의 활동에 대하여 모두 안전한 것으로 나타났다. 그러나 집중호우 시 퇴적장 사면 상부의 풍화된 마사토는 사면침식과 붕괴 위험성이 높아 배수로 설치 등 적절한 유지관리를 통한 안정대책이 필요하다고 생각된다.

Keywords

HOMHBJ_2018_v107n4_385_f0001.png 이미지

Figure 1. The present condition plane and cross section of the slope.

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Figure 2. The cross section of the slope.

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Figure 3. Assumptions on cross section of the embankment slope.

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Figure 4. A representative cross section of the embankment slope.

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Figure 5. Results of stability analysis during dry season.

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Figure 6. Results of stability analysis during rainy season.

Table 1. Information of the masonry embankment slope.

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Table 2. Soil constants applied to the masonry retaining wall.

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Table 3. The results of slope stability analysis.

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