Undrained behaviour of polypropylene fibre reinforced sandy soil under monotonic loading |
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Authors: | Wiam Khebizi Sidali Denine Jean Canou Jean-Claude Dupla |
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Institution: | 1. Laboratory of Material Science and Environment (LMSE), Hassiba Ben Bouali University of Chlef-Algeria, Chlef, Algeria;2. Laboratoire Navier-Geotechnique, Ecole des Ponts Paris Tech, Paris, France |
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Abstract: | Soil improvement using fibres is widely used in soil stabilisation to prevent sand liquefaction. In order to study the undrained behaviour and liquefaction resistance of sand reinforced with polypropylene fibres, a series of triaxial compressive tests were conducted on unreinforced and reinforced Chlef sand with different contents of polypropylene fibres (0, 0.3, 0.5 and 0.8%). Samples were prepared at 30% and 80% relative densities representing loose and dense states respectively, and triaxial tests were performed at confining pressures of 50, 100 and 200 kPa. Tests results show that fibre inclusion has a significant effect on the shear strength and dilation of sandy soil. The increase in strength is function of fibre content, relative density and confining pressure. The maximum strength improvement for both loose and dense fibre-reinforced sand is more pronounced at higher confining pressure and at higher fibre content. |
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Keywords: | Sand undrained triaxial tests polypropylene fibres liquefaction shear strength |
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