In recent years, geogrid materials have been widely adopted for high fill slopes of airports in mountainous regions, as they can cope with the heavy earth/stonework, high filling height, complex filler properties and diverse topography. The properties of the soil-reinforcement interface (SRI) between geogrids and fillers directly bear on the safety of the reinforced structure. To improve the design of reinforced soil structure, it is imperative to determine the SRI properties in in-situ states, disclose the load transmission law, and identify the effective length of reinforcement strip. This paper carries out in-situ pull-out tests on the high fill slopes of an airport, explores the in-situ pull-out properties of geogrids under long-term, large-scale earth/stonework construction, and analyses the variation laws of parameters like strain, stress and displacement under different pull-out forces. Assuming that the relationship between strain and position is an S-curve, the theoretical relationships between these parameters and geogrid position were derived. Through the comparison against the test results, it is proved that the S-curve model outputted basically the same laws with those observed in the tests. The research findings provide a valuable reference for the design of reinforced soil structure
reinforced soil slope, geogrid, in-situ pull-out test, soil-reinforcement interface (SRI), s-curve
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