ANALYSIS OF RESILIENCE AGAINST SEEPAGE FLOW IN EMBANKMENT LAYER DUE TO PUDDLE WATER ON SIDE OF HIGHWAY PAVEMENT STRUCTURE

Paved roads on low land often undergo excessive deformation as a result of water seepage into the subgrade and embankment layers, which makes the soil softened. The heterogeneous density of the soil in the embankment and the subgrade layer of the road will result in a difference in soil pore pressure, resulting in seepage of water from the puddle water that enters the embankment layer[1,4] . Therefore the embankment soil needs to be made solid and homogeneous, so the void ratio and porosity become smaller, but the soil pore pressure value gets larger. If the soil pore pressure is greater than the hydrostatic pressure of the water puddle next to the embankment, then the puddle water will not seep into the embankment, or the subgrade layer of the road [7,8]. Embankment resistance level to water seepage (horizontal) due to hydrostatic pressure from water puddles on the embankment side is strongly determined by minimum void ratio (emin), minimum porosity (nmin), and minimum permeability (kmin) [6]. This paper presents the results of analysis that can be used as a reference in designing embankment that can resist water puddle infiltration that is usually accommodated on the side of the highway during the rainy season. There are two indicators of the embankment resistancy to water seepage, which could be used as a control tool in the seepage embankment plan, namely: (i) The thickness of water seepage into the embankment, which can be calculated by Eq. (12), and (ii) The flooding time permission of water on the embankment side, which also can be calculated by Eq. (13).