The interfacial properties between geo-grid and soil are important for representing the reinforcement of the geo-grid and are of great influences on the stability and the deformation-failure characteristics of geo-grid structures.At present

various specifications and standards fail to consider the influences of mesh sizes on the parameters selection of geo-grid soil interface

leading to artificial selection of geo-grid in practical engineering.In this paper

the numerical model studies the characters of geo-grid interface through comparative analysis between indoor experiments and numerical methods.The results show that the mesh size of geo-gird has dramatic influences on the characteristics of geo-grid interface.Through analyzing the principles of the influences of different mesh sizes on the interface characters

it shows that the friction effects of geo-grid interface should be excluded from the comprehensive friction on the interface to explore the effects of reinforcement more directly.Meanwhile

the reasonable mesh size of geo-grid should ensure that the effective contact between geo-grid and soil should be one-third of the whole interface.