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Geogrid allows the fill on one side of the grid can key with fill on the other side of the grid. Hence, it is different in its interlocking ability when compared with strip soil reinforcement. The keying-in of both sides of fill could be achieved by compaction and static load above the fill.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.