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)
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.
徐 超，石志龙. 循环荷载作用下筋土界面抗剪特性的试验研究[J]. 岩土力学，2011，32(3)：655-660.(XU Chao，SHI Zhilong. Experimental research on shearing resistance property of sand-geogrid interface under cyclic load[J]. Rock and Soil Mechanics，2011，32(3)：655-660.(in Chinese))
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2013, Vol. 32 
