Abstract

In this research, “Slide” program was used to analyze seepage flow under the hydraulic structure through isotropic and anisotropic soils and its effect on structures with cut-off at downstream, at upstream, and at both of them. The distribution curves of uplift pressure along the floor had been reached at downstream for different degrees of anisotropy from the horizontal axis. The effects of anisotropy on uplift pressure . The analysis process depends on a finite element method. Eight-noded quadratic elements to represent the porous media. The maximum values of uplift pressure under the structure with cut-off at downstream are seen at 180˚, and 0˚ inclination angles and the minimum values are seen at 90˚ inclination angle, the maximum values of uplift pressure under the structure with cut-off at upstream are at 90˚ inclination angle and the minimum values are at 180˚, and 0˚ angles, and the maximum values of uplift pressure under the structure with cut-off at upstream and downstream are at 90˚ inclination angle and the minimum values are at 180˚, and 0˚ inclination angles but the relationship is reversed after x=0.5. The quantity of seepage in downstream side of the structure with a cut-off at downstream was 0.546 m3 /day, at upstream was 0.396 m3 /day, and at both of them was 0.501 m3 /day. The quantity of seepage for anisotropic soils was calculated for all cases.