STUDY ON DIRECT SHEAR TEST ON INTERFACE PERFORMANCE OF GEOGRID AND CORASE-GRAINED SOIL

摘要

In expressway construction for mountain areas, uni-axial and biaxial geogrid are commonly used as reinforcement for subgrade and coarse-grained soil is commonly used for subgrade filling. The paper, based on this fact,mainly talks about such main factors which affect reinforced soil interface like compactness, water content, geogrid pore diameter and coarse-grained soil diameter with large direct shear test method. Following conclusions are thus made: interface friction angle will increase with the increase of filling compactness and will decrease at increasing extent with the increase of water content; interface friction angle is related to geogrid pore diameter and there's an optimum pore diameter; interface friction coefficient ratio will increase with the increase of P5 content in coarse grain filling.