Role of Geogrid’s Structure on the California Bearing Ratio of the Reinforced Soil

Document Type : Original Article

Authors
Azita Asayesh 1
Morteza Shahmohammadi 2
S. Majdeddin Mir Mohammad Hosseini 3
1 Department of Textile Engineering, Amirkabir University of Technology (Tehran Polytechnic), Iran
2 Textile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
3 Civil and Environmental Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
10.48302/jtp.2025.542898.1319
Abstract
The use of geosynthetic materials is a well-established and effective approach for reinforcing soil and improving its bearing capacity in geotechnical applications. Among these materials, geogrids have gained particular importance due to their ability to interlock with soil particles and enhance load distribution. In the present study, the effect of geogrid’s structure on the California Bearing Ratio (CBR) of the reinforced soil has been investigated. For this purpose, warp-knitted polyester geogrids with various structures (Chain stitch + inlay, Tricot + inlay longitudinal ribs connected by inlay/weft yarns) were produced, coated, and tested for tensile strength and CBR. Results showed that geogrid reinforcement enhances soil CBR up to 20%, with a linear relationship between CBR and the ratio of geogrid elastic moduli in orthogonal directions. The geogrid structure significantly affected CBR, with Chain stitch/weft yarn configurations demonstrating superior reinforcement due to higher tensile strength and elastic modulus in both directions. The findings emphasize the significance of geogrid structure in enhancing soil reinforcement.
Keywords
Geogrid
warp knitted
California Bearing Ratio (CBR)
fabric structure
tensile