제내 비탈끝 배수공을 이용한 하천제방의 침윤조절

Abstract

The levee is the facility which is constructed along with river for the protection of landside and controlling flowing water when there is a flood. When the seepage is exposed to the atmosphere on the landside surface of levee, it may eventually lead to levee failure. The seepage water may be removed from the landside surface by a properly designed drainage system. Two drainage method of pervious toe drain were studied and compared. One is the pervious toe drain suggested by U.S. Army Corps of Engineers (USACE) and the other is that by Japan Institute of Construction Engineering (JICE). The levee model constructed has the following dimension: the base width is 2.6 ; the crest width is 0.4 ; the side slope 1:2. The water depth in the riverside is 0.5 . The shape of toe drain by USACE is triangular. It was installed with the base length of 0.4 . The shape of toe drain by JICE is rectangular. It had the bottom length of 0.4 . The levee model without the toe drain showed saturation surface on the land side in the experiment but not with the toe drain. Numerical analysis using SEEP/W was also performed after model calibration. The experiments and numerical analysis results showed that the phreatic surfaces using the drain by JICE were slightly lower than those by USACE, i.e., the toe drain by JICE is a little bit safer than the drain by USACE. It is also easier to construct the toe drain by JICE.