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| INFLUENCE OF PARTICLE-SIZE GRADATION ON SHEAR BEHAVIOR OF GEOSYNTHETICS AND SAND INTERFACE |
| LIU Feiyu1，LIN Xu1，WANG Jun2 |
| (1. Department of Civil Engineering，Shanghai University，Shanghai 200072，China；2. College of Architecture and Civil Engineering，Wenzhou University，Wenzhou，Zhejiang 325035，China) |
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Abstract A series of large scale direct shear tests，involved three different particle-size gradations of sands with geogrids and geotextiles，were performed to investigate the interface shear strength and dilatancy of soil against geosynthetics. The effect of particle-size gradation，dense degree，types of geosynthetics and vertical stress on interface shear strength and dilatancy coefficient were investigated. The test results show that coarse sand and fine sand/geosynthetics interface have significantly higher shear strength than their mixed sand. Loose sand-geosynthetics interface displays only shear contraction during the shear process；while dense sand-geosynthetics interface presents obvious dilatancy. At the high stress level，sand-geosynthetics interface has larger shear displacement when it reaches peak shear strength than that of low stress. Coarse sand-geogrids interface has larger shear displacement when reaching peak strength than that of coarse sand-geotextile；while fine sand-geosynthetics interface shows the opposite results.
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Received: 05 December 2011
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2013, Vol. 32 
