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Laboratory Study of Geotextiles Performance on Reinforced Sandy Soil

Brahim Abdelkader, Arab Ahmed, Belkhatir Mostéfa, Shahrour Isam
Laboratory of Materials Sciences and Environment Civil Engineering Department, Hassiba Ben Bouali University of Chlef, Chlef 02000, Algeria

This paper presents the results of triaxial tests conducted for the investigation of the influence of geotextiles on stress-strain and volumetric change behaviour of reinforced sandy soil. Tests were carried out on loose sandy soil. The experimental program includes drained compression tests on samples reinforced with different values of both geotextiles layers (Ng) and confining pressure (σc). Two methods of preparation were used: air pluviation (AP) and moist tamping (MT). Test results show that the geotextiles induces a quasi-linear increase in the stress deviator (q) and volume contraction in the reinforced sand. Method ofpreparationsignificantlyaffectstheshear strength; samplesprepared by the air pluviation method andmobilized deviator stresses are significantly higher than those prepared by moisttamping method. Geotextiles restrict the dilation of reinforced sandy soil and consequently the contraction increases. The mobilized friction angle increases with increasing number of layers and decreases with increasing initial confining pressure. Samples prepared by moist tamping present mobilized friction angles significantly lower thanthose prepared by air pluviation method. For samples preparedby the air pluviation method (AP), the secant modulusat ε1=1% and 5% decreases with increasing geotextile layers; those prepared bythe moist tamping (MT) method, secant modulus at ε1=1% and 5% increases with increasing numberof geotextile layer sand confining pressure. From 10% axial strain, secant modulus increases with increasing inclusions of geotextile layers

Keywords:sand, triaxial, geotextile, drained, method of preparation, strength

DOI:
10.1007/s12583-015-0621-0
CLC number:
U469.72
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