Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Seepage Characteristics of Embankment as with/without Gravel Layer under the Earth Fill

성토층 하부의 자갈층 유·무에 따른 침투특성 변화

  • 이행우 (농업기반공사) ;
  • 장병욱 (서울대학교 농업생명과학대학 조경 지역시스템공학부) ;
  • 장웅희 (농업기반공사 농어촌연구원) ;
  • 김시운 (농업기반공사)
  • Published : 2005.07.01
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Abstract

A series of laboratory tests was carried out fur analyzing of seepage characteristics of two-layers embankment model which consists of gravel and earth fill layers. Gravel layers were built under the earth fill for a half and one-third width of earth fill of the model. Permeability of earth fill was ranged between $5.00\times10^{-5}\~3.00\times10^{-4}\;m/s$.. The tests were performed with hydraulic gradients(i), $0.10\~0.55$. From the test results, hydraulic head of earth fill with gravel layer was 1.6 times higher than that of earth fill without gravel layer. Seepage rate was increased up to $4\~22$ times and safety factor for piping was decreased to $13\~43\;\%$ comparing the earth fill with gravel layer to that without gravel layer. The gravel layer under the earth fill could, in general, give some serious seepage problems to seadike embankment.

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References

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