Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Real Scale Experimental Study for Evaluation of Permissible Shear Stresses on Vegetation Mats

식생매트 허용 소류력 평가를 위한 실규모 실험 연구

  • Lee, Du Han (River and Coastal Research Division, Korea Institute of Construction Technology) ;
  • Kim, Dong-Hee (Construction Quality & Safety Assessment Division, Korea Institute of Construction Technology) ;
  • Kim, Myounghwan (River and Coastal Research Division, Korea Institute of Construction Technology) ;
  • Rhee, Dong Sop (River and Coastal Research Division, Korea Institute of Construction Technology)
  • 이두한 (한국건설기술연구원 하천해안연구실) ;
  • 김동희 (한국건설기술연구원 건설품질안전평가연구실) ;
  • 김명환 (한국건설기술연구원 하천해안연구실) ;
  • 이동섭 (한국건설기술연구원 하천해안연구실)
  • Received : 2012.11.05
  • Accepted : 2012.12.06
  • Published : 2012.12.31
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Abstract

By the activation of environment-friendly river works, application of vegetation mats is increasing, however, evaluation techniques for hydraulic stability of vegetation mats are not presented. This study is conducted to develop the objective test method for vegetation mats. Two kind of vegetation mats are tested by the real scale experiments, and hydraulic quantities are measured and analyzed to evaluate acting shear stresses. Roughness and shear stress are evaluated by 1 D non-uniform model. After each tests, changes in mat surfaces and sub-soil are evaluated, and from these evaluation, 3 types of mat surface damages and 2 types of sub-soil damages are presented. In the study, the case in which some damages in mat surface don't cause loss of sub-soil, is presented to be in the stable condition. Appling this stable condition and acting shear stresses, permissible shear stresses of vegetation mats are evaluated, and the results show that the reinforced mat with wire netting has more permissible shear stress.

친환경 하천사업의 활성화로 식생매트의 사용은 증가하고 있으나 수리적 안정성에 대한 평가는 미흡한 실정이다. 본 연구는 호안용 식생매트 제품의 객관적인 수리안정성 시험 기법 개발을 위해 수행하였다. 이를 위해서 식생매트 2종에 대한 실규모 실험을 수행하여 수리량을 측정하고 분석하여 작용 소류력을 계산하였다. 1차원 부정류 모형을 이용하여 최적 조도계수를 결정하고 작용 소류력을 계산하였다. 각 유량의 시험 후에는 매트 표면 및 기반층의 변동 여부를 기록하여 평가하였으며 이에 따라 매트표면의 손상 유형 3가지 및 기반층의 손상 유형 2가지를 제시하였다. 본 연구에서는 식생매트의 표면 변동이 있더라도 하부 기반층의 유실이 발생하지 않는 경우에는 안정한 상태로 제안하였다. 이에 따라 실험체 2종의 허용소류력을 평가하였으며 철망으로 보강된 식생매트가 허용 소류력 측면에서 효과가 있는 것을 확인할 수 있었다.

Keywords

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