Pullout behaviour of geogrid embedded in granular soils

摘要

The paper deals with preliminary results of a large experimental program aimed to study the behaviour of geosynthetics embedded in compacted granular soils in short and long-term pullout conditions. In this paper the results of pullout tests performed at constant displacement rate on HDPE extruded geogrid embedded in two different compacted granular soils are analysed. The discussion of the results of this phase of the research program allows to evaluate the influence of reinforcement length, confining stress and soil type on interface behaviour in pullout condition. In particular, the influence of the mobilization of interface shear strength and the dilatancy effects on soil-geogrid pullout interaction are discussed.