Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Analysis on Failure Causes and Stability of Reinforced Earth Wall Based on a Field Case

현장사례를 이용한 보강토옹벽의 파괴원인 및 안정성 분석

  • Hong, Kikwon (School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang Univ.) ;
  • Han, Jung-Geun (School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang Univ.) ;
  • Lee, Jong-Young (GEO Healtech Co., Ltd.) ;
  • Park, Jai-Seok (OHJU Civil Engineering, Co., Ltd.)
  • Received : 2013.02.15
  • Accepted : 2013.03.14
  • Published : 2013.03.30
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Abstract

This paper describes the global stability of the reinforced earth wall, which was collapsed by heavy rainfall. The seepage analysis was conducted to confirm the change effect of groundwater level on slope with reinforced earth wall. The seepage analysis result confirmed that the change of groundwater level is greatly influenced by rainfall. According to the change of groundwater level, the global stability analysis with reinforced earth wall was conducted based on the results of seepage analysis. The safety factor of the slope was 0.476 when the wall is collapsed firstly. The collapse cause analyzed that soil strength was weaken because the ground was saturated by continuous rainfall. Therefore, the global stability, which is considered heavy rainfall, should be conducted at design and construction of reinforced earth wall.

본 연구에서는 집중강우에 의해 파괴가 발생한 보강토옹벽의 현장사례를 바탕으로 강우가 보강토옹벽의 안정성 미치는 영향을 분석하기 위하여 침투해석을 수행하였다. 또한 침투해석 결과를 바탕으로 지하수위 변화에 따른 보강토옹벽의 전체사면에 대한 안정성을 평가하였다. 침투해석 결과, 본 연구대상 현장에 형성되는 지하수위는 강우의 영향이 민감하게 작용하는 것으로 확인되었다. 이를 바탕으로 보강토옹벽에 대한 전체사면 안정성을 평가한 결과, 보강토옹벽의 최초 파괴 당시의 안전율이 0.476으로 나타났다. 즉, 보강토옹벽의 전체사면에 대한 활동파괴는 지속적인 강우 및 집중강우로 인하여 과도한 지표수 유입에 따른 급속한 지하수위 상승이 직접적인 원인으로 분석되었다. 따라서 보강토옹벽의 설계 및 시공 시, 최근 발생하고 있는 집중강우를 대비한 설계 및 이를 고려한 다양한 안정해석을 통하여 안정성을 확보할 필요가 있음을 확인하였다.

Keywords

References

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