For the design of geogrid reinforced earth walls, the maximum vertical spacing of geogrids is limited to 800mm in FHWA/AASHTO. There is no such limitations in BS code 8006-1:2010.When the design is carried out for reinforced earth structure with gabion box facing and secondary reinforcement using BS Code, the external, internal and global stability criteria are fullfilled even if the vertical spacing of primary reinforcement is 2m at upper levels.
What is the basis for limiting the maximum vertical spacing to 800mm in AASHTO?
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