A theoretical model for anchored geosynthetics in pull-out tests

A theoretical model is presented for the pull-out response of strip anchor reinforcement based on a nonlinear elastic (hyperbolic) shear stress-displa cement relationship for the soil-reinforcement interface. The interface pul l-out mechanism has been simplified by formulating the boundary conditions for the anchor section. Additional terms for the soil-reinforcement interac tion, which incorporate the anchor section, are also introduced. A new conc ept of an anchorage factor (anchor-to-strip reinforcement capacities), the relative stiffness, and the displacement parameters are defined to explain the pull-out behaviour. A parametric study is carried out for a range of re lative stiffness values, interface shear stresses, and anchorage factors. T he normalised load-displacement relationship and the variations of pull-out force and displacements with distance along the reinforcement, at differen t anchorage factors, are presented. Experimental pull-out test results for planar reinforcements are also examined/compared with the model using a zer o anchorage factor. The model helps to evaluate the pull-out displacements, stresses, and strains along the length of the strip anchor reinforcement.