Soil-Geogrid interaction in pullout test with unloading-reloading process

摘要

In this test the geogrid was pushed back and forth at three stages of pullout test: before peak, at peak and at residual part to simulate the seismic activities. Different geometry of geogrids exhibits influence of geogrid’s opening, transverse ribs on pullout resistance. In this research, square and circle geogrids and a plate are tested. Results revealed that unloading-reloading decreased pullout resistance of geogrid at the peak values and at the residual parts however it had little impact before the peaks. The soil-geogrid interaction process was analyzed by the Particle Image Velocimetry furthermore spatial discretization scheme in finite element method to understand about the dilatancy mechanism and shear strain distribution during unloading-reloading processes.