مشخصات پژوهش

To ensure the safety of earthfill dam during the operation phase, determining the seepage mechanism and the affecting factors are most important. In this study, the seepage behavior through body of an earthfill dam with different core shapes is investigated by 2D finite element seepage analysis via Geo Studio software. For this end, a model of earthfill dam with different heights and three core types of vertical, inclined and diaphragm is considered. In all of three types of clay cores, the core has different slopes and geometries. Also the effect of anisotropy in the permeability of the clay core and foundation of dam's material are investigated. Based on the analysis result, seepage discharge and maximum hydraulic gradient in dam with inclined core becomes greater than dam with vertical core. With decreasing the slope of inclined core with constant width, the seepage discharge and maximum hydraulic gradient of core increase. The height of dam has direct influence on the seepage discharge and maximum hydraulic gradient. Also, by increasing anisotropy ratio of core material, seepage discharge through dam body increases and phreatic level in core goes up. By increasing anisotropy ratio of foundation material, seepage discharge and maximum hydraulic gradient of foundation increase. However, it has not significant effect on seepage characteristic through dam body. Furthermore, presence of cutoff wall in foundation of dam decreases seepage discharge from dam body and increases the maximum hydraulic gradient at the junction of core and cutoff wall.