Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30073
Laboratory Evaluation of Geogrids Used for Stabilizing Soft Subgrades

Authors: Magdi M. E. Zumrawi, Nehla Mansour

Abstract:

This paper aims to assess the efficiency of using geogrid reinforcement for subgrade stabilization. The literature of applying geogrid reinforcement technique for pavements built on soft subgrades and the previous experiences were reviewed. Laboratory tests were conducted on soil reinforced with geogrids in one or several layers. The soil specimens were compacted in four layers with or without geogrid sheets. The California Bearing Ratio (CBR) test, in soaking condition, was performed on natural soil and soil-geogrid specimens. The test results revealed that the CBR value is much affected by the geogrid sheet location and the number of sheets used in the soil specimen. When a geogrid sheet was placed at the 1st layer of the soil, there was an increment of 26% in the CBR value. Moreover, the CBR value was significantly increased by 62% when geogrid sheets were placed at all four layers. The high CBR value is attributed to interface friction and interlock involved in the geogrid/ soil interactions. It could be concluded that geogrid reinforcement is successful and more economical technique.

Keywords: Geogrid, reinforcement, stabilization, subgrade.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1123791

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1687

References:


[1] B. M. Das, K. H. Khing, E. C. Shin, “Stabilization of Weak Clay with Strong Sand and Geogrid at Sand-Clay Interface,” Transportation Research Board, 1611, National Research Council, Washington, 1998, pp. 55-62.
[2] W. C. Huang, “Improvement evaluation of subgrade layer under geogrid-reinforced aggregate layer by finite element method,” International Journal of Civil Engineering, Vol. 12, No. 3, Transaction B: Geotechnical Engineering, July 2014.
[3] R. M. Koerner, Designing with Geosynthetics, Sixth Edition, Xlibris Publishing Co., 2012.
[4] P. E. Stephen Archer, “Subgrade Improvement for Paved and Unpaved Surfaces Using Geogrids,” Contech Construction Products Inc., 2008.
[5] R. M. Koerner, Designing with Geosynthetics, Fourth Edition, Prentice Hall, Upper Saddle River, New Jersey, 1998.
[6] S. Maxwell, W. H Kim, T. B. Edil, and C. H. Benson, “Effectiveness of Geosynthetics in Stabilizing Soft Subgrades, ” Final Report, Wisconsin Highway Research Program No. 0092-45-15, Geotechnical Engineering Program Department of Civil & Environmental Engineering, University of Wisconsin-Madison, October, 2005.
[7] R. G. Carroll, J. C. Wall, and R. Hass, “Granular Base Reinforcement of Flexible Pavements Using Geogrids,” In Geosynthetics 987: Conference Proceedings, New Orleans, February 24–25, 1987, pp. 46–57.
[8] G. T. Houlsby, and R. A. Jewell, “Design of Reinforced Unpaved Roads for Small Rut Depths,” In Proceedings of the 4th International Conference on Geotextiles, Geomembranes and Related Products, The Hague, Netherlands, Vol. 1, 1990, pp.171–176.
[9] P. Singh, and K. S. Gill, “CBR Improvement of clayey soil with Geo-grid Reinforcement,” IJETAE Vol.2, 2012, pp. 315-318.
[10] H. Moayedi, S. Kazemian, A. Prasad, B. Huat, “Effect of Geogrid Reinforcement Location in Paved Road Improvement,” EJGE Vol. 14, 2009.
[11] R. D. Barksdale, S. F. Brown, and F. Chan, “Potential Benefits of Geosynthetics in Flexible Pavement Systems,” National Cooperative Highway Research Program, Report 315, Transportation Research Board of the National Academies, Washington, D.C., 1989.
[12] I. L. Al-Qadi, T. L. Brandon, R. J. Valentine, and T. E. Smith, “Laboratory Evaluation of Geosynthetic Reinforced Pavement Sections,” In Transportation Research Record: Journal of the Transportation Research Board, No. 1439, Transportation Research Board 73rd Annual Meeting, Washington, D.C., 1994, pp. 25–31.
[13] S. L. Webster, “Geogrid Reinforced Base Courses for Flexible Pavements for Light Aircraft,” Report No. GL-93-6. Report for the U.S. Department of Transportation, Federal Aviation Administration, Depart. of Army Geotechnical Laboratory, Vicksburg, Mississippi, 1991.
[14] S. A. Naeini, and R. Z. Moayed, “Effect of plasticity index and reinforcement on the CBR value of soft clay,” International journal of Civil Engineering. Vol. 7, No.2, 2009.
[15] S. W. Perkins, M. Ismeik, and M. L. Fogelsong, “Mechanical Response of a Geosynthetic-Reinforced Pavement System to Cyclic Loading,” In Proceedings of the 5th International Conf. on the Bearing Capacity of Roads and Airfields, Trondheim, Norway, Vol. 3, 1998, pp. 1503–1512.
[16] R. Hufenus, R. Rueegger, and R. Banjac, “Full-Scale Field Tests on Geosynthetic Reinforced Unpaved Roads on Soft Subgrade,” Geotextiles and Geomembranes, Vol. 24, No. 1, 2006, pp. 21–37.
[17] X. Tang, G. Chehab, A. M. Palomino, S. R. Allen, and C. J. Sprague, “Laboratory Study on Effects of Geogrids Properties on Subgrade Stabilization of Flexible Pavements,” In Proceedings of Geo Congress 2008, New Orleans, March 9–12, 2008, p. 310.
[18] British Standard 1377, Methods of Test for Soils for Civil Engineering Purposes. British Standard Institution, London, 1990.