Slurry Cell Testing, Drilling Continues at Boone Dam

OCTOBER 5, 2017—Slurry cell testing on the dam’s earthen embankment involves drilling and then injecting a cement, water and bentonite clay slurry mixture (pictured below) into the dam along the previously constructed grout lines, or “grout curtains.” Engineers and geologists are evaluating the grout curtain’s ability to contain slurry and provide stability during cutoff wall construction.

The slurry is similar to the material used in completing the cutoff wall, a key component in the composite seepage barrier being constructed inside and underneath the embankment, to depths that could approach 300 feet. You can see a basic schematic of the cutoff wall here. Collectively, these improvements will prevent further erosion or seepage under the embankment.