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

Document Type : Original Article

Authors
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.
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

[1] Rajesh, U., Sajja, S., Chakravarthi, V.K., 2016. Studies on
the engineering performance of geogrid-reinforced soft
subgrade, Transportation Research Procedia, 17, pp.164-173
[2] Ramjiram Thakur, S., Naveen, B.P., Tegar, J.P., 2021.
Improvement in CBR value of soil reinforced with nonwoven
geotextile sheets, International Journal of Geo-Engineering,
12(1), pp.1-10
[3] Rudramurthy, M., Vikram, M.B., 2016. Effect of
geotextiles on CBR values, International Journal of Emerging
Trends in Engineering and Development, 1(6), pp.118-125
[4] Naeini, S.A., Mirzakhanlari, M., 2008. The effect of
geotextile and grading on the bearing ratio of granular soils,
EJGE, 13, pp.1-10
[5] Kumar, P.S., Devi, S.P., 2011. Effect of needle punched
nonwoven coir and jute geotextiles on CBR strength of soft
subgrade, ARPN Journal of Engineering and Applied
Sciences, 6, pp.114-116
[6] Ogundare, D.A., Familusi, A.O., Osunkunle, A.B.,
Olusami, J.O., 2018. Utilization of geotextile for soil
stabilization, American Journal of Engineering Research
(AJER), 7(8), pp.224-231
[7] Hossain, A., Adnan, A., Alam, M.M., 2015. Improvement
of granular subgrade soil by using geotextile and jute fiber,
International Journal of Science, Technology and Society,
3(5), pp.230-235
[8] Singh, P., Gill, K.S., 2012. CBR improvement of clayey
soil with geogrid reinforcement, International Journal of
Emerging Technology and Advanced Engineering, 2(6),
pp.456-462
[9] Adams, C.A., Apraku, E., Opoku-Boahen, R., 2015. Effect
of triaxial geogrid reinforcement on CBR strength of natural
gravel soil for road pavements, Journal of Civil Engineering
Research, 5(2), pp.45-51
[10] Kuity, A., Roy, T.K., 2013. Utilization of geogrid mesh
for improving the soft subgrade layer with waste material mix
compositions, Procedia-Social and Behavioral Sciences, 104,
pp.255-263
[11] Duncan-Williams, E., Attoh-Okine, N.O., 2008. Effect of
geogrid in granular base strength–An experimental
investigation, Construction and building materials, 22(11),
pp.2180-2184
[12] Adams, C.A., Tuffour, Y.A., Kwofie, S., 2016. Effects of
soil properties and geogrid placement on CBR enhancement of
lateritic soil for road pavement layers, American Journal of
Civil Engineering and Architecture, 4(2), pp.62-66
[13] Mittal, A., Shukla, S., 2019. Strength improvement of
poor subgrade soil reinforced with polyester biaxial geogrid,
Jordan Journal of Civil Engineering, 13(2), pp.214-225
[14] Mittal, A., Shukla, S., 2018. Influence of geotextile and
geogrid reinforcement on strength behaviour of soft silty soil,
Applied Mechanics and Materials, 877, pp.264-269
[15] Mittal, A., Shukla, S., 219. Effect of geosynthetic
reinforcement on strength behaviour of weak subgrade soil,
Materials Science Forum, 969, pp.225-230
[16] Mittal, A., 2018. Effect of non-woven geotextile and
biaxial geogrid reinforcement on the strength behaviour of
subgrade soil, International Journal of Civil Engineering,
5(10), pp.28-32
[17] Venkatesh, G., Suluguru, A.K., 2020. Effective study of
geocell, geogrid and geotextile as geo-reinforcement on CBR
and resilient modulus value of subgrade, Solid State
Technology, 63, pp.2557-2573
[18] Shams, B., Ardakani, A., Roustaei, M., 2020. Laboratory
investigation of geotextile position on CBR of clayey sand soil
under freeze-thaw cycle, Scientia Iranica, 27(6), pp.2808-2816
Asayesh et al. /Journal of textiles and polymers
34
[19] Kumar, P.S., Rajkumar, R., 2012. Effect of geotextile on
CBR strength of unpaved road with soft subgrade, Electronic
Journal of Geotechnical Engineering, 17(1), pp.1355-1363
[20] Lakshmi, S.M., Lakshmi, S.V., 2023. Soil strength
improvement by reinforcing soil with geotextiles. Materials
Today: Proceedings, 22
[21] Baadiga, R., Balunaini, U., 2024. Effective CBR and
Elastic Modulus of Geogrid-Stabilized Prepared Subgrades
Overlying Existing Soft Subgrades, International Journal of
Geosynthetics and Ground Engineering, 10(41), pp.1-17
[22] Poorahong, H., Jamsawang, P., Thanasisathit, N.,
Jongpradist, P., Jing, G., 2024. Performance of a triaxial
geogrid-reinforced crushed rock base underlain by a soft clay
subgrade, Case Studies in Construction Materials, 20,
p.e03198.
[23] ASTM C136-01. (2020) Standard Test Method for Sieve
Analysis of Fine and Coarse Aggregates.
[24] ASTM D5261-10. (2018) Standard Test Method for
Measuring Mass per Unit Area of Geotextiles.
[25] ASTM D5199-12. (2019) Standard Test Method for
Measuring the Nominal Thickness of Geosynthetics.
[26] ASTM D6637-01 (2010) Standard Test Method for
Determining Tensile Properties of Geogrids by the Single or
Multi-Rib Tensile Method.
[27] ASTM D698-00A. (2021) Standard Test Methods for
Laboratory Compaction Characteristics of Soil Using Standard
Effort.
[28] ASTM D 1883 – 07 (2010). Standard Test Method for
CBR (California Bearing Ratio) of Laboratory-Compacted
Soils.
[29] Perkins, S.W., Ismeik, M. A., 1997. Synthesis and
evaluation of geosynthetic-reinforced base layers in flexible
pavements-part i., Geosynthetics International, 4(6), pp.549-
604
[30] Tutumluer, E., Kang, M., Qamhia, I.I., 2025.
Geosynthetic stabilization of road pavements, railroads, and
airfields, Transportation Geotechnics, 50, p.101321.