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Experimental Study of Down-Scaled Model Slope on the Variation of the Ground Water Level of Drainable Soil Nailing

배수겸용 쏘일네일링의 지하수위 변화에 관한 축소모형사면 실험연구

Young-Nam Kim1
,
Young-Su Chae2
,
Kang-Il Lee3*
김 영남1
,
채 영수2
,
이 강일3*
1Vice President, Dongmyeong Engineering Consultants
2Professor, Dept. of Civil Engineering, The Suwon University
3Professor, Dept. of Civil Engineering, Daejin University
*교신저자. *Corresponding Author. 
30 March 2013. pp. 39-50
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Abstract

This study aims at investigating the behavior of the ground water level when installing upward soil nails that drain water as well. To do this, a series of down-scaled model tests were conducted. A model slope with weathered soils was prepared and then an artificial rain was scattered on the slope. The relative densities of soil specimen were 60%, 75%, and 90%, and the rainfall intensities 50mm/hr, 75mm/hr, 100mm/hr, and 125mm/hr, respectively. The experimental parameters, such as the ground water level, ratio of soil runoff, and failure mode of the slope were measured and analyzed. As the results, It may be concluded that the ground water level in the slope supported by drainable upward soil nails increases very gradually while the unsupported soil changes dramatically. In addition, the ground water level becomes constant and no failure occurs as time goes by. In case of the relative density of 75%, the runoff ratio seemed to increase up to about 8~15% after reinforcement.

Keywords
Down-scaled model test
Horizontal drain
Drainable soil nailing
Artificial rain

본 연구는 국내에서 널리 사용되고 있는 하향식 쏘일네일과 수평배수공의 별도 설치에 대한 일반적인 사고의 틀에서 벗어나 보강과 동시에 수평배수를 겸할 수 있는 상향식 쏘일네일을 설치할 경우 지하수위의 거동에 대한 특성을 축소모형실험을 통해 연구하였다. 이를 위해 실내에서 모형토조 내에 풍화토 지반의 모형사면을 만들고 그 위에 인공강우를 뿌리는 실험을 통해 상대밀도가 60%, 75%, 90%인 각 지반조건별로 50mm/hr, 75mm/hr, 100mm/hr 및 125mm/hr인 4가지 경우의 강우강도에 대하여 실험을 하였으며, 이로 부터 시간에 따른 지하수위, 사면의 유출비 및 사면의 파괴형태를 측정하고 분석하였다. 본 연구결과 배수기능을 겸한 상향식 쏘일네일로 보강한 지반의 경우 무 보강지반에 비해 지하수위 상승이 매우 완만하고 일정 시간이 경과 한 후 더 이상 증가하지 않았으며, 지반의 파괴도 발생하지 않았다. 또한, 상대밀도가 75%인 경우 보강 후는 보강 전에 비해 약 8∼15%정도 유출비가 증가하였다.

References
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1.Baek, U. J. (2006), An Experimental Study of a Slope in Weathered Soils Considering the Characteristics of Rainfall, Master Thesis, Daejin University, pp.22-62.
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 12
  • No :1
  • Pages :39-50
  • Received Date : 2013-02-07
  • Revised Date : 2013-03-24
  • Accepted Date : 2013-03-24
  • DOI :https://doi.org/10.12814/jkgss.2013.12.1.039
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