Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Seepage analysis of agricultural reservoir due to raising embankment

농업용 저수지 둑 높이기에 따른 제체의 침투류 해석

  • Lee, Dal-Won (Dept. of Agricultural and Rural Engineering, Chungnam National University) ;
  • Lee, Kwang-Sol (KRC(Korea Rural Community Corporation)) ;
  • Lee, Young-Hak (Dept. of Agricultural Engineering, Chungnam National University)
  • 이달원 (충남대학교 지역환경토목학과) ;
  • 이광솔 (한국농어촌공사 충남본부) ;
  • 이영학 (충남대학교 대학원)
  • Received : 2011.08.08
  • Accepted : 2011.09.19
  • Published : 2011.09.30
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Abstract

This study was carried out to safety evaluation, the practical application and improvement of design method of the agricultural reservoir due to raising embankments. Also, it was to compare and analyze the pore water pressure (PWP), seepage (leakage) quantity and piping phenomenon according to high water table and rapid drawdown. The seepage analysis by finite element analysis was used for steady state and transient condition. The pore water pressure distribution for steady state and transient condition showed positive(+) PWP on the upstream slope, it was gradually changed negative(-) PWP on the downstream slope. The PWP in the core ranged from 100 ~ -33 kPa, the seepage line in the incline-type core suddenly decreased towards the lower levels from the higher levels. The PWP according to rapid drawdown is remained in the vicinity of the upstream slope, therefore, it is investigated to be in an unstable state by the slope stability analysis. The PWP after raising embankments showed smaller than in the before raising embankments. It was likely to be the piping phenomenon because the gradients in the before raising embankments showed largely at downstream slope, and the stability for piping in the after raising embankments increased stable state. The seepage quantity per 1 day and the leakage per 100m for the steady state and transient condition appeared to be safe against the piping. It reduced slightly regardless of the transient condition before the raising embankments and it decreased largely about 2.4 times in the early days after the raising embankments.

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