Abstract: Due to its simple structure, easy construction, and low construction cost, earth-rock cofferdam is extensively used in water resources and hydropower engineering. The basis of cofferdam is usually composed of various sedimentary strata. Pores exist between gravel and sand particle together with the larger interstice in cofferdam itself lead to severe seepage, which consequently requires seepage control treatment. Controlled grouting proves to be one of the effective ways of seepage control. Based on the foundation seepage control project of Xinjiang Yikashi river, this paper expounded the seepage control techniques of controlled grouting for earth  rock cofferdam from the perspective of project design, construction technique, grouting material, and quality assessment, and thus can be taken as a reference for similar projects.

Key words:  controlled grouting  ,   earth - rock cofferdam ,    seepage control plan selection