원심모형실험을 이용한 모래지반에 관입된 계류선 거동 평가

Abstract

When an anchor penetrates and is installed under a seabed, a portion of the mooring line connected to the anchor is also embeddedunder the seabed. This embedded mooring line affects the capacity of the anchor in two ways. First, the frictional resistance that occurs between themooring line and the seabed reduces the pulling force acting on the anchor. Second, the embedded part of the mooring line forms a reverse catenaryshape due to the bearing resistance of the soil, so that an inclined pulling force is applied to the anchor. To evaluate the mooring line’s effect onthe capacity of an anchor in sand, centrifuge model tests were performed using two relative sand densities of 76% and 51% while changing theanchor depths. The test results showed that the load is reducedmuch more in deep and dense sand, and the inclination angle ofthe load is lowerin shallow and loose sand.