Abstract: The strengthening grouting of Danjiangkou dam heightening project requires great effort because it is carried out in conditions of reservoir high water head, developed micro-fissures and multiple groutings. In order to explore an economic and effective grouting method, current methods of curtain grouting in the presence of high water head are analyzed. On this basis, a detailed introduction of compound grouting test design, key construction technologies and inspection after grouting is given. The test results are analyzed in terms of pressurized water data, acoustic wave test, and fatigue pressurized water. Results reveal that cement-chemical compound grouting is effective, saves investment and shortens construction period. It is a good example for other engineering design and construction for curtain grouting under high head.

Key words: Danjiangkou project, high water head, compound grouting