Abstract: According to the seepage control requirements of curtain grouting engineering, the seepage control materials of bentonite-fly ash-cement is researched. The optimal formula of the seepage control materials is obtained by conducting the orthogonal test. The test results show that,groutability and stability of the seepage control materials are good, the pumpable time from 32 minutes to 55 minutes, the permeability coefficient of induration in 28 days is less than 2.0×10-7cm/s, the unconfined comprehensive strength is from 1.6 MPa to 1.9 MPa. The above research results can meet the requirement of water seepage control of curtain grouting completely and provide a scientific and reasonable ratio of seepage control materials of curtain grouting.

Key words: Permeability coefficient, Comprehensive strength, Curtain grouting, Grouting materials