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Stability Analysis of Geocell Reinforced Slope During Rainfall

강우 시 지오셀 보강 사면의 안정성 평가에 관한 연구

Eun-Chul Shin1*
,
Jang-Ill Kim2
신 은철1*
,
김 장일2
1Member, Professor, Dept. of Civil and Environment Enginnering, Incheon National Univ
2Nonmember, Ph. D. Student, Dept. of Civil and Environ. Engrg., Incheon National Univ
*교신저자. *Corresponding Author. 
30 December 2017. pp. 33-41
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Abstract

In this study, the increment effect of safety factor according to increasing of horizontal permeability coefficient is analyzed when geocell is installed on the slope for protection. To evaluate the horizontal permeability and reinforcement effect, the laboratory tests such horizontal permeability test were conducted. According to the laboratory test results, as the porosity rate of geocell increases, the coefficient of horizontal permeability is also increased. And also, regardless of the different types of filled materials, the coefficient of horizontal permeability is improved in a geocell reinforced ground compare with the non-reinforced ground. Laboratory test results and the rainfall intensity were applied to the numerical modeling of slope for seepage analysis and stability analysis of slope by using Soilworks, numerical analysis program. As a result of the slope stability analysis, it is confirmed that the installed geocell on the slope facilitates the drainage of water on the surface of slope. Hence, the ground water elevation is suppressed. Therefore, the safety factor of the slope is increased by the increasing of the internal friction angle, apparent cohesion, and coefficient of horizontal permeability by reinforcing the slope with geocell.

Keywords
Geocell
Seepage analysis
Reinforced slope
Stability analysis
Horizontal permeability

본 연구에서는 3차원 구조의 토목섬유인 지오셀을 사면 법면 보호공으로 설치 시 사면 지표면의 수평투수계수 증가에 따른 안전율 증가 효과에 대하여 분석하였다. 지오셀의 수평투수능력과 보강효과를 평가하기 위해 실내실험으로 각각 수평투수실험 을 수행하였다. 지오셀을 설치한 지반이 무보강지반보다 수평투수계수가 증가되었으며, 다공율이 6.43%인 기존 지오셀(지오 셀 B)보다 38.18%인 격자구조의 지오셀 A를 지반에 설치했을 때, 수평투수계수가 더 증가하는 것으로 나타났다. 사면안정해 석 컴퓨터 프로그램인 Soilworks를 사용하여 실내실험 결과와 강우강도를 모델링한 성토사면에 적용 후 침투해석과 사면안정 해석을 수행하였다. 사면안정해석 결과 강우시 지오셀 보강사면의 지하수위 상승 억제 및 지표의 강우 유출효과를 확인하였으 며, 내부마찰각과 겉보기 점착력의 증가와 더불어 수평투수계수의 증가로 인하여 사면의 안전율이 증가하는 것으로 나타났다.

References
1
ASTM D4716 (2014), “Standard Test Method for Determining the (In-plane) Flow Rate per Unit Width and Hydraulic Transmissivity of a Geosynthetic Using a Constant Head”, ASTM International, West Conshohocken, PA.
2
Kim, S. K. (1988), “Stability Analysis for a Dyke Subjected to Tidal Fluctuations”, Journal of Korean Society Civil Engineers, Vol. 8, No. 3, pp. 91-100 (in Korean).
3
Korea Infrastructure Safety Corporation (2011), Design Standard of Slope for Construction (in Korean).
4
Lee, S. J. (2004), Estimation of Unsaturated Shear Strength and Soil Water Characteristic Curve for Weathered Granite Soil, Ph. D. Thesis, Korea Advanced Institute of Science and Technology.
5
Shin, E. C., Kang, H. H., and Park, J. J. (2017), “Reinforcement Efficiency of Bearing Capacity with Geocell Shape and Filling Materials”, KSCE Journal of Civil Eng-ineering, Vol.21, No.5, pp.1648-1656.
6
Shin, E. C., Lee, W. H., Kang, H. H., and Oh, Y. I. (2010), “Experimental Study for Determination of Horizontal Permeability with considering various Geocell Shapes”, 2010 Korean Geotechnical Society Conference. (in Korean).
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :4
  • Pages :33-41
  • Received Date : 2017-10-13
  • Accepted Date : 2017-11-24
  • DOI :https://doi.org/10.12814/jkgss.2017.16.4.033
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