Analysis on Seepage of Saturated and Unsaturated Soil of Embankments on the Lower Yellow River

The paper analyzes the seepage of the Yellow River embankments by using two-dimensional seepage model of saturated and unsaturated soil system and in accordance with the fact of saturated and unsaturated status of the river embankments.The outcomes show that a) the transient location of phreatic line changes fast at the initial period of water level variation and getting slower along with the time;b) equipotential line extends from saturated zone to unsaturated zone,showing the water flow in the saturated and unsaturated zones under the actions of head fall between equipotential lines;c) hydraulic head changes gradually from positive to negative from dyke top to bottom and isobar of central embankment is almost parallel with the phreatic line and;d) at the beginning,velocity vector is vertical to the surface,gradually turns into the inside of dyke and partially becomes parallel with the phreatic line.It is almost vertical to the dyke toe at the toe location.The velocity vector exists both in the above and below the phreatic line.