Abstract: This paper presents a case history of rapid treatment of groundwater gushing in an irrigation tunneling excavation at the right shoulder of a doubleway gravity dam in Southwest China. The treatment measures included diverting groundwater through concentrated boreholes drilled in a very short period and drilling inclined borehole for the cement slurry grout. After the shortterm treatment, the longterm treatment measure was to grout the rock mass after the installation of the reinforced concrete liner. The grouting curtain in the longterm treatment was over lapsed with the slurry wall above the tunnel so that the irrigation tunnel was surrounded by the grouted curtain. This treatment can provide a short response time and rapid treatment of the groundwater 〖JP2〗gushing hazards. This method can also provide experience for the rapid groundwater diverting, grouting procedure and rapid tunnel liner installations. The testing on the grouted area indicated that the treatment method was successful.

Key words: Gushing Water, Rapid Treatment, Lining Concrete, Grouting, Construction Technology, Gravity Dam