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An evaluation of a crushed stone filter and gabion retaining wall for reducing internal erosion of agricultural reservoirs

  • Lee, Young-Hak (Institute of Agricultural Science, Chungnam National University) ;
  • Lee, Dal-Won (Department of Agricultural and Rural Engineering, Chungnam National University) ;
  • Ryu, Jung-Hyun (Department of Agricultural and Rural Engineering, Chungnam National University) ;
  • Kim, Cheol-Han (Hyundai City Corporation) ;
  • Heo, Joon (Rural Research Institute, Korea Rural Community Corporation) ;
  • Shim, Jae-Woong (Rural Research Institute, Korea Rural Community Corporation)
  • Received : 2020.04.29
  • Accepted : 2020.07.14
  • Published : 2020.09.01

Abstract

Recent changes in the disaster environment have greatly increased the possibility of internal erosion in deteriorated reservoirs; thus, countermeasure methods are required to enhance the drainage performance of embankments. Sand filters have been mainly used to prevent internal erosion; however, due to the sand depletion and environmental problems, new alternative materials are required to replace the sand in the filter zone. In this study, crushed stone was used instead of sand as a material that could satisfy permeability, material supply, demanding conditions, and economic efficiency. Although crushed stone has excellent drainage performance, it has a clogging phenomenon due to its high permeability. Accordingly, the materials need to be separated with a geotextile wrapping method. Additionally, the 3D numerical analysis and a large model experiment were conducted to evaluate the seepage characteristics and in-site application of the crushed stone filter. As a result, the crushed stone filter showed an excellent dispersion effect by reducing the pore water pressure by about 9.5 times that of the sand filter. In addition, it was shown that the safety factor for piping increased significantly by reducing internal erosion. When comparing the economics and supply and demand conditions of the material, crushed stone was evaluated as an effective method to reduce the internal erosion of embankments at deteriorated reservoirs.

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