This paper presents results of an experimental study on the effects of neutral, positive and negative pressure soil subjected to pullout of geogrids, using a large equipment. For the tests, in addition to the two types of geogrids, with and without drainage device, a thin soil layer at optimum moisture for compression and saturated condition. Various overloads were applied, simulating normal interface pressure. The results expressed a linear relationship between resistance to pullout and the average effective normal stress near the soil-geogrid interface, regardless of the condition of saturation. It also noted that the mobilization of necessary offsets to overcome the resistance to pullout of the inclusions in flooded conditions was well higher than the required for offsets in optimum moisture for compaction.
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