Abstract: In order to verify the feasibility of the curtain grouting to improve the performance of the seepage control in the fracture rock zone, the field grouting tests were performed. The grouting test used diamond bit, rotary drilling, the inner circulation, topdown segmentation and grouting method. The rock core sampling and water pressurizing tests indicate that the grouting method was appropriate and the seepage of the fractured rock zone was able to reduce. The test results indicate that the row spacing of the curtain grouting should be smaller than 1.7R, where R is the radius of the grouting slurry penetrating distance, and the borehole spacing should be les 1.5R. different grouting tests were performed for the selection of grouting materials, sequence and grouting slurry penetrating radius.

Key words: Fractured Rock Zone, Curtain Grouting, Grouting Tests, Water Pressurize Testing, Seepage Rate