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Evaluation of Lateral Deformation and Vertical Stress of Geosynthetics Reinforced Walls by the Scale Model Test

축소모형실험을 통한 토목섬유 보강토옹벽의 수평변위 및 수직응력 평가

Sam-Deok Cho1
,
Kwang-Wu Lee2*
,
Seung-Kyong You2
조 삼덕1
,
이 광우2*
,
유 승경2
1Member, Senior Research Fellow, Geotechnical Engineering Research Institute, Korea Institute of Civil engineering and building Technology
2Member, Senior Researcher, Geotechnical Engineering Research Institute, Korea Institute of Civil engineering and building Technology
Member, Professor, Dept. of Civil Engineering, Myongji College
*교신저자. *Corresponding Author. 
30 December 2017. pp. 119-127
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Abstract

This paper presents a study of reinforced earth model wall reinforced by geosynthetics subjected to vertical surcharge. 7 types of reinforced earth model wall were constructed in the model box (100 cm×140 cm×100 cm) to assess the deformation and stress behavior of model walls according to different tensile strength and laying number of reinforcement and surcharge pressures. 3 types of geosynthetics that have different tensile strength were used as reinforcement. The test was carried out by changing the number of reinforcement to 5, 7, 9, and surcharge pressure to 50, 100, 150, 200, 250 kPa. The model test found that the maximum lateral displacements occurred at the 0.7 H (H : Wall height) position from the bottom of the model wall and vertical stress was low in the smaller surcharge pressure and the larger tensile strength of reinforcement.

Keywords
Geosynthetics reinforced wall
Scale model test
Lateral deformation
Vertical stress

보강토체 상부에 작용하는 상재하중과 보강재의 인장강도 및 포설 단수가 보강토옹벽의 변형거동에 미치는 영향 을 평가하기 위해 7종류의 축소모형 보강토옹벽을 축조하여 상재하중 재하실험을 수행하였다. 축소모형 보강토옹 벽은 100cm×140cm×100cm 크기의 모형토조 내에서 1m 높이로 축조하였으며, 인장강도가 상이한 3종류의 보강재 를 사용하여 포설 단수를 5단, 7단, 9단으로 변화시키고, 5종류(50, 100, 150, 200, 250kPa)의 상재하중을 단계적으로 재하하면서 전면벽체의 수평변위와 보강재의 인장변형률 및 보강토체 저면의 수직응력 등을 측정하여 분석하였 다. 분석 결과, 전면벽체의 수평변위는 보강토옹벽 하단부에서 가장 작고 보강토옹벽 하단으로부터 0.7H (H : 옹벽 높이) 지점에서 가장 큰 비선형적인 형태를 보여주며, 상재하중이 작고 보강재의 인장강도가 클수록 보강재의 상대적인 보강효과가 크게 발현되어 보강토체 하부의 수직응력이 작게 나타남을 알 수 있었다.

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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 : 16
  • No :4
  • Pages :119-127
  • Received Date : 2017-11-29
  • Revised Date : 2017-12-13
  • Accepted Date : 2017-12-13
  • DOI :https://doi.org/10.12814/jkgss.2017.16.4.119
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