Geogrid Segment Blocks on Retaining Wall Construction
Geogrid segment block for reinforced retaining walls can be constructed where the reinforced fill zone is constrained by using a combination of geogrid reinforcement and anchor reinforcement. The design theory for reinforced soil walls where the reinforced fill zone is constrained and where anchors are used to dissipate the reinforcement residual tensile stresses beyond the reinforced fill zone. A case study is also presented where this technique was successfully used.
Geogrid Segment Blocks
Geogrid reinforced segmental block retaining walls have become an accepted practice for economical retaining wall construction. For this retaining wall system the segmental blocks act as the wall facing, and provide some stability, with the majority of the stability provided by the geogrid reinforced fill behind the segmental block facing. For stability, the geogrid reinforcement has to have adequate design strength, be located at specific vertical spacings in the reinforced fill, and extend an adequate distance into the reinforced fill. While geogrid reinforcement design strengths and vertical spacings are easy to attain, the required reinforcement lengths into the reinforced fill may be difficult to attain if there are outcrops of heavily over consolidated soils, soft rocks or hard rocks in close vicinity to the retaining wall. In these instances it can be impractical to excavate the heavily overconsolidated soil or rock and thus, some additional means must be found to fully dissi-pate the tensile stresses induced in the reinforcement over its truncated length.