조립토 지반에 설치된 침투트렌치의 비침투량(比浸透量) 산정식 제안

Abstract

Recently, runoff is increasing suddenly due to heavy rainfall and development, for this, the damages are increasing. And although the runoff reduction facilities are installed for preventing this damage, the proper infiltration formula in soil condition of Jeju area isn't made exactly. Also if a pre-existed formula is applied in estimating an infiltration, the infiltration is different from a true infiltration because soils distributed in Jeju area have high permeability. So to suggest the specific infiltration formula for granular which has high permeability, the model test was conducted. Through this model test, the specific infiltration formula was suggested as following. Kt(㎡/m) = 7.565h+(2.428W-0.025) And it is expected that the infiltration obtained from suggestion formula is higher than it obtained from a pre-existed formula about twice. Also In-situ permeameter test and infiltration test were conducted for 8 pointe in 4 areas. For In-situ permeameter test, coefficient of permeability was estimated from Borehole Test with constant water level. Also critical infiltration was obtained from infiltration test. The results of permeameter test was from 1.03×10^(-2)to 1.63×10^(-1)(cm/sec), permeability was very high. Also critical infiltration was from 22.24 to 212.7(㎥/hr), high infiltration effect was obtained. But critical infiltration obtained from a pre-existed formula was very low from 15.73 to 148.21(㎥/hr). So critical infiltration obtained from in-situ infiltration test, a pre-existed formula, suggestion formula was compared respectively. In result, critical infiltration obtained from suggestion formula was closed to critical infiltration obtained from in-situ infiltration test