Application of Seepage Analysis to Increase Stability of the Dam

Abstract

Seepage through slightly weathered sandstone. Fine grained, which the earth dam resting on it causing the hydraulic uplift head about 0.40 meter at the surface of weathered rock adjacent to dam site, Nong Lai reservoir project, Khon Kaen province, north easthem, Thailand. Top soil layer, thickness about 1.20 meters from surface of weathered rock was line sandy sill loose blow count less than 10, was disturbed by uplift force and turned to swamped area. So, we must to stripping the disturbed saturated soil out, controlling of outflow water through fractures and small joints by sand and gravel filter blanket 0.15 meter thick and after that recomputed by selected material such as clayey gravel.