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• W2029199512 abstract "불포화 조건에서 흙의 초기 밀도에 따라 흙-함수특성곡선이 변화시키게 되며, 이로 인하여 불포화 조건에서 투수특성도 변화하게 된다. 이에 대한 영향을 고찰하기 위하여 상대밀도 40%, 60% 및 75%의 주문진 표준사에 대한 건조 및 습윤과정에서의 흙-함수특성곡선(SWCC)과 불포화 투수계수함수를 산정하였다. van Genuchten (1980)의 방법을 이용하여 흙-함수특성곡선(SWCC)을 산정한 결과 공기유입값과 관계된 계수 <TEX>${alpha}$</TEX>는 습윤과정에서 더 큰 값을 가지며, 변곡점의 경사에 관계된 계수 n과 잔류함수비에 관계된 계수 m은 건조과정에서 더 큰 값을 갖는다. 그리고 상대밀도가 증가할수록 공기함입치는 증가하지만 수분함입치는 감소하며, 동일한 상대밀도에서 공기함입치는 수분함입치보다 크게 발생된다. 한편, 계수추정방법 가운데 하나인 van Genuchten (1980)의 방법을 적용하여 불포화 투수계수함수를 산정한 결과 불포화 투수계수는 포화시 투수계수로 일정하게 유지되다가 공기함입치 혹은 수분함입치 직전에 급격하게 감소하는 것으로 나타났다. 건조과정에서의 포화투수계수는 습윤과정에서의 포화투수계수보다 크게 나타나며, 상대밀도가 증가함에 따라 건조 및 습윤과정에서의 포화투수계수는 감소한다. 실험결과에 의하면 주문진 표준사의 초기 간극비에 따라 흙-함수특성곡선(SWCC)에서의 공기함입치(AEV)는 감소하고 포화투수계수는 증가하므로, 흙-함수특성곡선(SWCC)과 불포화 투수계수함수(HCF)는 초기 간극비에 영향을 받는 것으로 나타났다. The Soil-Water Characteristics Curve (SWCC) is affected by the initial density of soil under unsaturated condition. Also, the characteristic of hydraulic conductivity is changed by the initial density of soil. To study the effect of initial density of unsaturated soil, SWCC and the Hydraulic Conductivity Function (HCF) of Jumoonjin sand with various relative densities, 40%, 60% and 75% were measured in both drying and wetting processes. As the results of SWCC estimated by van Genuchten (1980) model, the parameter related to Air Entry Value(AEV), <TEX>${alpha}$</TEX> in the wetting process is larger than that in drying process, but the parameters related to the SWCC slope, n and the residual water content, m are larger than those in wetting process. The AEV is increased or Water Entry Value (WEV) is decreased with increasing the relative density of sand. The AEV is larger than the WEV at the same relative density of sand. As the results of HCF estimated by van Genuchten (1980) model which is one of the parameter estimation methods, the unsaturated hydraulic conductivity maintained at a saturated one in the low level of matric suctions and then suddenly decreased just before the AEV or the WEV. The saturated hydraulic conductivity in drying process is larger than that in wetting process. The saturated hydraulic conductivity is decreased with increasing the relative density of sand in both drying and wetting processes. Also, the hysteresis in unsaturated HCFs between drying and wetting process was occurred like the hysteresis in SWCCs. According to the test results, the AEV on SWCC is decreased and the saturated hydraulic conductivity is increased with increasing the initial density. It means that SWCC and HCF are affected by the initial density in the unsaturated soil." @default.
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• W2029199512 date "2013-01-01" @default.
• W2029199512 modified "2023-09-26" @default.
• W2029199512 title "Estimation on Unsaturated Hydraulic Conductivity Function of Jumoonjin Sand for Various Relative Densities" @default.
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• W2029199512 doi "https://doi.org/10.12652/ksce.2013.33.6.2369" @default.
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