Abstract

The purpose of this study is to investigate the influence of various parameters involved, such as the strength properties of fibres, the relative size of fibres and grains and the rate of shear on the shear strength of polypropylene or carbon fibre reinforced cohesive soils with different percentage loading of fibres. The experimental results reveal that the inclusion of polypropylene fibres in soil increases considerably the shear strength. Contrarily, the inclusion of the carbon fibres did not produce a clear beneficial effect. In both cases, the shear strengths results are attributed to the different micro mechanisms involved in the fibre/soil interactions as studied through scanning electron micrographs. A significant outcome from the current work is that the strength of the reinforced soil composites is independent of the fibre mechanical indexes.

Keywords:

Carbon fibres, polypropylene fibres, reinforced soil,

References

1. Ahmad, F., F. Bateni and M. Azmi, 2010. Performance evaluation of silty sand reinforced with fibres. Geotext. Geomembranes, 28(1): 93-99.
   CrossRef    
2. Al Wahab, R.M. and H.H. Al-Qurna, 1995. Fiber reinforced cohesive soils for application in compacted earth structures. Proceedings of Geosynthetics '95, Nashville, Tennessee, pp: 433-446.
   
3. Al Wahab, R.M.A. and M.A. El-Kedrah, 1995. Using fibers to reduce tension cracks and shrink/swell in a compacted clay. Proceedings of the Geoenvironment 2000 ASCE, 1: 791-805.
   
4. Bauer, G.E. and A. Oancea, 1996. Triaxial testing of granular soils reinforced with discrete polypropylene fibers. Proceedings of the 1st European Geosynthetics Conference on Geosynthetics: Applications, Design and Construction. Rotterdam, pp: 407-410.
   
5. Casagrande, M.D.T., M.R. Coop and N.C. Consoli, 2006. Behavior of a fiber-reinforced bentonite at large shear displacements. J. Geotech. Geoenviron., 132(11): 1505-1508.
   CrossRef    
6. Casagrande, M.D.T., M.R. Coop and N.C. Consoli, 2007. Behavior of a fiber-reinforced bentonite at large shear displacements (Discussion closure paper). J. Geotech. Geoenviron., 133(12): 1635-1636.
   CrossRef    
7. Choubane, B., R.K. Ho and J.M. Armaghani, 1999. Full-scale laboratory evaluation of polypropylene fiber reinforcement of subgrade soils. Research Report No. 99-432, Florida Department of Transportation.
   
8. Consoli, N.C., J.P. Montardo, P.D.M. Prietto and G.S. Pasa, 2002. Engineering behavior of a sand reinforced with plastic waste. J. Geotech. Geoenviron., 128(6): 462-472.
   CrossRef    
9. Consoli, N.C., M.D.T. Casagrande, P.D.M. Prietto and A. Thome, 2003. Plate load test on fiber-reinforced soil. J. Geotech. Geoenviron., 129(10): 951-955.
   CrossRef    
10. Falorca, I.M.C.F.G., M.I.M. Pinto and G.L.M. Ferreira, 2006. Residual shear strength of sandy clay reinforced with short polypropylene fibres randomly oriented. Proceedings of the 8th International Conference on Geosynthetics. Yokohama, 4: 1663-1666.
    
11. Farrag, K.A. and P. Griffin, 1993. Pull-out Testing of Geogrids in Cohesive Soils. In: Cheng, S.C.J. (Ed.), Geosynthetic Soil Reinforcement Testing Procedures. ASTM STP 1190, Philadelphia, pp: 76-89.
    CrossRef    
12. Fishman, K.L. and S. Pal, 1994. Further study of geomembrane/cohesive soil interface shear behaviour. Geotext. Geomembranes, 13(9): 571-590.
    CrossRef    
13. Fredlund, D.G. and H. Rahardjo, 1993. Soil Mechanics for Unsaturated Soils. Wiley, New York.
    CrossRef    
14. Freilich, B.J., C. Li and J.G. Zornberg, 2010. Effective shear strength of fiber-reinforced clays. Proceeding of the 9th International Conference on Geosynthetics. Brazil, pp: 1997-2000.
    
15. Gray, D.H. and H. Ohashi, 1983. Mechanics of fiber reinforcement in sand. J. Geotech. Eng-ASCE, 109(3): 335-353.
    CrossRef    
16. Gregory, G.H. and D.S. Chill, 1998. Stabilization of earth slopes with fiber reinforcement. Proceedings of the 6th International Conference on Geosynthetics. Atlanta, pp: 1073-1078.
    
17. Ibraim, E. and S. Fourmont, 2006. Behaviour of sand reinforced with fibres. Proceedings of the Geotechnical Symposium in Roma. Netherlands, pp: 807-818.
    
18. Ibraim, E., A. Diambra, D.M. Wood and A.R. Russel, 2010. Static liquefaction of fibre reinforced sand under monotonic loading. Geotext. Geomembranes, 28(4): 374-385.
    CrossRef    
19. Kaniraj, S.R. and V.G. Havanagi, 2001. Behavior of cement-stabilized fiber-reinforced fly ash-soil mixtures. J. Geotech. Geoenviron., 127(7): 574-584.
    CrossRef    
20. Li, C., 2005. Mechanical response of fiber-reinforced soil. Ph.D. Thesis, University of Texas, Austin, USA.
    
21. Lopes, M.L. and M. Ladeira, 1996. Influence of the confinement, soil density and displacement rate on soil-geogrid interaction. Geotext. Geomembranes, 14(10): 543-554.
    CrossRef    
22. Maher, M.H. and D.H. Gray, 1990. Static response of sands reinforced with randomly distributed fibers. J. Geotech. Eng., 116(11): 1661-1677.
    CrossRef    
23. Michalowski, R.L., 1997. Limit stress for granular composites reinforced with continuous filaments. J. Eng. Mech., 123(8): 852-859.
    CrossRef    
24. Michalowski, R.L. and A. Zhao, 1996. Failure of fiber-reinforced granular soils. J. Geotech. Eng-ASCE, 122(3): 226-234.
    CrossRef    
25. Michalowski, R.L. and J. Cermak, 2003. Triaxial compression of sand reinforced with fibers. J. Geotech. Geoenviron., 129(2): 125-136.
    CrossRef    
26. Moraci, N. and D. Gioffre, 2006. A simple method to evaluate the pullout resistance of extruded geogrids embedded in a compacted granular soil. Geotext. Geomembranes, 24(2): 116-128.
    CrossRef    
27. Murray, J.J., J.D. Frost and Y. Wang, 2000. Behavior of a sandy silt reinforced with discontinuous recycled fibre inclusions. Transport. Res. Rec., 1714: 9-17.
    CrossRef    
28. Ozkul, Z.H. and G. Baycal, 2007. Shear behavior of compacted rubber fiber-clay composite in drained and undrained loading. J. Geotech. Geoenviron., 133(7): 767-781.
    CrossRef    
29. Pradhan, P.K., R.K. Kar and A. Naik, 2012. Effect of random inclusion of polypropylene fibers on strength characteristics of cohesive soil. Geotech. Geol. Eng., 30(1): 15-25.
    CrossRef    
30. Racana, N., M. Grediac and R. Gourves, 2003. Pull-out response of corrugated geotextile strips. Geotext. Geomembranes, 21(5): 265-288.
    CrossRef    
31. Rao, S.V.K. and A.M.A. Nasr, 2012. Laboratory study on the relative performance of silty-sand soils reinforced with linen fiber. Geotech. Geol. Eng., 30(1): 63-74.
    CrossRef    
32. Sadek, S., S.S. Najjar and F. Freiha, 2010. Shear strength of fiber-reinforced sands. J. Geotech. Geoenviron., 136(3): 490-499.
    CrossRef    
33. Shewbridge, S.E. and N. Sitar, 1990. Deformation-based model for reinforced sand. J. Geotech. Geoenviron., 116(7): 1153-1170.
    CrossRef    
34. Tang, C., B. Shi, W. Gao, F. Chen and Y. Cai, 2007. Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil. Geotext. Geomembranes, 25(3): 194-202.
    CrossRef    
35. Tang, C.S., B. Shi and L.Z. Zhao, 2010. Interfacial shear strength of fiber reinforced soil. Geotext. Geomembranes, 28(1): 54-62.
    CrossRef    
36. Tingle, J.S., S.L. Webster and R.L. Santoni, 1999. Discrete fiber reinforcement of sands for expedient road construction. Report GL 99-3, U.S. Army Corps of Engineers Waterways Experiment Station, Vicksburg.
    CrossRef    
37. Webster, S.L. and R.L. Santoni, 1997. Contingency airfield and road construction using geosynthetic fiber stabilization of sands. Report GL 97-4, U.S. Army Corps of Engineers Waterways Experiment Station, Vicksburg.
    
38. Zaimoglu, A.S. and T. Yetimoglu, 2012. Strength behavior of fine grained soil reinforced with randomly distributed polypropylene fibers. Geotech. Geol. Eng., 30(1): 197-203.
    CrossRef    
39. Ziegler, S., D. Leshchinsky, H.I. Ling and E.B. Perry, 1998. Effect of short polymeric fibers on crack development in clays. Soils Found. J. Appl. Clay Sci., 38(1): 247-253.
    CrossRef    
40. Zornberg, J.G., 2002. Discrete framework for limit equilibrium analysis of fibre reinforced soil. Geotechnique, 52(8): 593-604.
    CrossRef    

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