Assessment of damage and jamming ability of innovative 3D geogrid at the sand – crushed stone interface

Introduction. The paper presents comparative results of experimental studies of innovative 3D geogrids in comparison with traditionally produced flat geogrids Slavros SD-40 and Armoset B, used for reinforcement of soil foundations. Damageability of geogrids under compaction load, separating function of geogrids and wedging ability were evaluated during experimental studies.

Materials and methods. The wedging ability, separating function and resistance to failure of ready-made geogrids samples were evaluated in laboratory conditions using the developed design of a test container, which is a metal box with dimensions 20 × 20 × 20 cm and a metal lid with dimensions 19.5 × 19.5 × 10.5 cm with a wall thickness of 5 mm. A ZIM P-10 hydraulic machine was used as a press to simulate the sealing unit.

Results. Damage test results showed that the Armoset B and Slavros SD-40 geogrid specimen sustained numerous damages in the form of rib failures, indentations and kinking of individual strands. Based on the total amount of damage and the nature of damage to the laid paper layer, as an indicator, the jamming of the stone material is minimal, characteristic tears on the sheet are observed and the penetration of the stone material through the reinforced geogrid is noticeable. For 3D geogrid, based on the number of damages on the paper layer, we can speak about a sufficient and high percentage of stone material jamming. The geogrid perfectly coped with the function of separation of loose sand and crushed stone layers. The jamming of stone material occurs above the reinforcement layer, which is very important for reinforcing interlayers and increasing the efficiency of reinforcement layers.

Conclusions. The results of experimental studies with the developed design of innovative 3D geogrid showed that this geogrid has significant prospects for its application as a reinforcing interlayer in civil engineering. More extensive experimental studies are required to assess the operational efficiency.

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