Reinforcing Design for Intake High Slope at the Underground Powerhouse of Longtan Hydropower Station

The excavation of intake for the underground powerhouse of Longtan hydropower station formed a slope as high as 435 m with the slope area of 270,000 m 2. The design must provide the reverse stratified rock high slope, which has complicated outline, with sufficient stability to ensure the safety operation of the dam section at intake. In this paper, a brief introduction is made to the design principle and standard of the high slope, the profile design of the high slope, drainage system against seepage, reinforcing and supporting measures and controlling measures during construction of the project.