Field Observations on Stabilization of Unpaved Roads with Geosynthetics
Publication: Journal of Geotechnical Engineering
Volume 122, Issue 7
Abstract
The construction, instrumentation, and response to vehicle trafficking of an unpaved road on soft ground are described. The road is comprised of an unreinforced section, three sections with different geotextiles, and a section with geogrid. The performance of the unreinforced section compares reasonably well, at large rut depths, to prediction using the analytical approach most commonly used in current design practice. Inclusion of a geosynthetic between the base course layer and subgrade soil led to a significant improvement in trafficability. The improvement was greatest for the thinner base layer of 25 cm, and diminished with increasing layer thickness. Reasonable agreement was, again, observed between the field performance and analytical predictions at large rut depths. The analytical approach was found to significantly overpredict the number of vehicle passes to develop a 5 cm rut. The lack of agreement at small to moderate rut depths is attributed to compaction of the base course layer in response to vehicle trafficking that is not accounted for in the analytical approach. Some implications of the field observations for selection of a geosynthetic are discussed, with reference to separation and reinforcement of gravel layers over soft soils.
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References
1.
Austin, D. N., and Coleman, D. M. (1993). “A field evaluation of geosynthetic-reinforced haul roads over soft foundation soils.”Proc., Geosynthetics '93, Industrial Fabrics Assoc. Int., St. Paul, Minn., 65– 80.
2.
Burd, H. J., and Brocklehurst, C. J. (1990). “Finite element studies of the mechanics of reinforced unpaved roads.”Proc., 4th Int. Conf. on Geotextiles, Geomembranes and Related Products, A. A. Balkema, Rotterdam, The Netherlands, 217–221.
3.
De Gardiel, R., and Javor, E. (1986). “Mechanical reinforcement of low-volume roads by geotextiles.”Proc., 3rd Int. Conf. on Geotextiles, Austrian Association of Engineers and Architects, Vienna, Austria, 1021–1026.
4.
Delmas, P., Matichard, Y., Gourc, J. P., and Riondy, G. (1986). “Unsurfaced roads reinforced by geotextiles—a seven-year experiment.”Proc., 3rd Int. Conf. on Geotextiles, Austrian Association of Engineers and Architects, Vienna, Austria, 1015–1022.
5.
Douglas, R. A. (1990). “Anchorage and modulus in geotextile-reinforced unpaved roads.”Geotextiles and geomembranes. Elsevier Science Publishers BV (North-Holland), Amsterdam, The Netherlands, No. 9, 261–267.
6.
Fannin, R. J. (1987). “Geogrid reinforcement of granular layers on soft clay,” PhD thesis, University of Oxford, England.
7.
Giroud, J. P., Ah-line, C., and Bonaparte, R. (1984). “Design of unpaved roads and trafficked areas with geogrids.”Proc., Symp. on Polymer Grid Reinforcement in Civ. Engrg., Thomas Telford, London, 116–127.
8.
Giroud, J. P., and Noiray, L.(1981). “Geotextile-reinforced unpaved road design.”J. Geotech. Engrg., ASCE, 107(9), 1233–1254.
9.
Hammit, G. M. (1970). “Thickness requirement for unsurfaced roads and airfields—bare base support.”Tech. Rep. No. S-70-54, U.S. Army Corps of Engrs., Waterways Experiment Station, Vicksburg, Miss.
10.
Houlsby, G. T., and Jewell, R. A. (1990). “Design of reinforced unpaved roads for small rut depths.”Proc., 4th Int. Conf. on Geotextiles, Geomembranes and Related Products, A. A. Balkema, Rotterdam, The Netherlands, 171–176.
11.
Jarrett, P. M. (1984). “Evaluation of geogrids for construction of roadways over muskeg.”Proc., Symp. on Polymer Grid Reinforcement in Civ. Engrg., Thomas Telford, London, 149–153.
12.
Kinney, T. C. (1979). “Fabric induced changes in high deformation soil-fabric-aggregate systems,” PhD thesis, Univ. of Illinois at Urbana, Champaign, Ill.
13.
Love, J. T., Burd, H. J., Milligan, G. W. E., and Houlsby, G. T. (1987). “Analytical and model studies of reinforcement of a granular layer on a soft clay subgrade.”Can. Geotech. J., Vol. 24, 611–622.
14.
Milligan, G. W. E., Jewell, R. A., Houlsby, G. T., and Burd, H. J.(1989). “A new approach to the design of unpaved roads—part I.”Ground Engrg., 22(3), 25–29.
15.
Potter, J. F., and Currer, E. W. H. (1981). “The effect of a fabric membrane on the structural behaviour of a granular road pavement.”Lab. Rep. No. 996, Transport and Road Research Laboratory (TRRL), Crowthorne, England.
16.
Ramalho-Ortiago, J. A., and Palmiera, E. M. (1982). “Geotextile performance at an access road on soft ground near Rio de Janeiro.”Proc., 2nd Int. Conf. on Geotextiles, Industrial Fabrics Assoc. Int., St. Paul, Minn., 353–358.
17.
Sigurdsson, O. (1993). “Geosynthetic stabilization of unpaved roads on soft ground: a field evaluation,” MS thesis, Univ. of British Columbia, Vancouver, Canada.
18.
Standard classification of soils for engineering purposes (the unified soil classification system); ASTM D 2487. (1993). ASTM, Philadelphia, Pa.
19.
Webster, S. L., and Alford, S. J. (1978). “Investigation of construction concepts for pavements across soft grounds.”Tech. Rep. No. S-78-6, U.S. Army Corps of Engrs., Waterways Experiment Station, Vicksburg, Miss.
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Copyright © 1996 American Society of Civil Engineers.
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Published online: Jul 1, 1996
Published in print: Jul 1996
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