Analysis on hydraulic gradient at the bottom of the concrete cutoff walls in strengthening earthrock dams

Several treatment ways of the connection passages between the bottom of the cutoff wall and grouting curtain on strengthening earth clams in Jiangxi province were summarized in this paper. Based on a practical project,the hydraulic gradient of the bottlm of the cutoff wall on the treatment ways of the connection passage was analyzed by the finite element software. The result shows:In a certain upstream water head,the scheme which put a cementing-wall in front of the grouting curtain can make the lowest hydraulic gradient in the bottom of the cutoff wall and is the best solution in the viewpoint of safety.