9.6.4 Anchored retaining wall
In this case, a horizontal rod or a helical anchor called tieback is used to reinforce retaining walls for stability (Figure 30). One end of the tieback is secured to the wall while the other end is anchored to a stable structure, such as a concrete deadman which has been driven into the ground or anchored into earth with sufficient resistance. Grouted tiebacks can be constructed as steel rods drilled through a concrete wall out into the soil or bedrock on the other side (Figure 31). Grout is then pumped under pressure into the tieback anchor holes so that the rods can utilize soil resistance to prevent tieback pullout and wall destabilization.
Figure 30: Anchored wall in the soil
Figure 31: Application of tieback on the piles through competent layer of rock