In many retaining wall applications, sufficient space does not exist behind the face units to allow excavation and subsequent placement of geosynthetic reinforcement. In these applications, the Landmark direct-anchorage retaining wall system is a more aesthetically pleasing and less costly alternative to the conventional cast-in-place concrete that would often be used in such situations.

Direct anchorage consists of an anchor (e.g., soil nail) installed into the ground and connected to galvanized steel beams (walers) placed within the horizontal cavity in the Landmark retaining wall blocks, which were specifically designed to accommodate them.

Each steel beam spans two adjacent anchors, transferring the load from the segmental retaining wall units to the anchors. The space between the excavated face and the Landmark units is filled with free-draining aggregate.

In addition to transferring stresses from the retained soil to the block, the fill is selected to provide drainage between the excavated surface and the wall face. Since the Landmark units are not mortared, but interlocked, hydrostatic pressure is released through the joints in the blocks as well as the drain outlets typically placed along the bottom of the wall.

Information in this section is typical and should not be used for construction without the seal, when required, of a registered Professional Engineer in the state in which the wall will be constructed.

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