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원심모형실험을 활용한 투수성이 낮은 기초지반에 위치한 보축 제방에서의 침투 거동

The Evaluation of Seepage Characteristics in Reinforced Embankment Constructed on Low Permeable Clay Layer Through Centrifuge Model Tests

  • 진석우 (한국과학기술원 건설 및 환경공학과) ;
  • 추연욱 (한국과학기술원 건설 및 환경공학과) ;
  • 김영묵 (한밭대학교 건설환경공학과) ;
  • 김동수 (한국과학기술원 건설 및 환경공학과) ;
  • 임은상 (한국수자원공사 K-water연구원 기반시설연구소)
  • Jin, Seok-Woo (Dept. of Civil and Environment Engrg., KAIST) ;
  • Choo, Yun-Wook (Dept. of Civil and Environment Engrg., KAIST) ;
  • Kim, Young-Muk (Dept. of Civil and Environment Engrg., Hanbat National Univ.) ;
  • Kim, Dong-Soo (Dept. of Civil and Environment Engrg., KAIST) ;
  • Im, Eun-Sang (Infrastructure Research Center, K-water Institute, K-Water)
  • 투고 : 2011.11.18
  • 심사 : 2012.05.08
  • 발행 : 2012.05.31

초록

본 논문에서는 보편적인 제방 보강공법 중 하나인 보축 공법이 적용된 실제 제방을 대상으로 하여, 원심모형시험을 수행하고 조건에 따른 제방의 침투 거동을 분석하였다. 동일한 단면 조건에서 투수성이 낮은 양질의 재료가 제내지를 보축한 경우와 제외지를 보축한 경우에 대한 원심모형시험을 수행하고 각 경우를 비교하여, 보축 방향에 따른 영향을 분석하였다. 또한, 대상 현장의 제방은 투수성이 낮은 세립토층에 축조되어 있었으며, 이에 대한 영향을 분석하였다. 제외지 보축의 경우, 시간이 흐름에 따라 제내지 보축의 경우에 비해 포화영역의 확산이 적고 느리게 나타났다. 제내지 보축된 경우, 상대적으로 빠르게 포화영역이 확대되었으나, 제내지 보축의 낮은 투수성으로 침투수가 많이 유출되지는 않았다. 낮은 투수성의 하부 기초지반은 포화영역이 확대되었으며, 또한 기초지반 아래에서 배수층에 작용하는 압력으로 인한 과잉간극수압에 의해 보다 빠르게 포화가 진행되었다.

In this paper, a series of centrifuge tests were performed to evaluate the seepage characteristic of reinforced embankment. The centrifuge models simulated an actual embankment reinforced by enlargement of levee cross-section. The centrifuge models have the same conditions except the locations of enlargement with low permeable material : water-side and land-side. In addition, the prototype embankment is constructed on low permeable clay layer. In the case of water-side reinforcement, the reinforced zone makes water head down and the saturated zone of embankment propagates slowly. In the case of land-side reinforcement embankment, the saturated zone enlarged relatively faster but the amount of exit water at land-side toe was very small because of the land-side reinforcement zone. The low permeable clay foundation layer was being continuously saturated by the inflow from the embankment as well as the uplift flow from the permeable layer induced by the excess pore water pressure.

키워드

참고문헌

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