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Pullout tests of geogrid in a cemet-mixed well-graded gravel backfill were performed. The pullout displacements of the geogrid were smaller with a geogrid with a higher stiffness, and were not much different even when the confining pressure on the geogrid were different twice. The pullout displacement was 15-30mm in maximum, and one third of them recovered when the pullout load was released. It also showed large creepy increment under constant loading. Extension tests were also performed on the same type of geogrid in the laboratory, and their results were compared with those from the pullout tests. As a conclusion, pullout behaviours of a relatively soft reogrid in a stiff cementmixed gravel is largely affected by the extension property of the geogrid itself, as well as by the slippage property between the geogrid and the backfill materials.
国際ジオシンセティックス学会日本支部の論文