Some factors affecting the results of pull-out tests of geogrid in soil

Abstract

In this research, we conducted a series of pull-out test of geogrid in soil focusing on the characteristics of pull-out box, such as its size or type, and clarified the influences of those factors on the test results. Moreover, we examined the problems of pull-out test including the necking of geogrid specimen and the arch action caused by front wall. As a result, it turned out that the size of pull-out box, the shape of pull-out sleeve and the stiffness of front wall have a great influence on the results of pull-out test while the shape of the box’s rear-end part as well as the loading method of pull-out load have a little influence on the frictional strength parameter obtained from the test. Furthermore, it was also found that the pull-out resistance mechanism differs depending on the form of geogrid, and that the pull-out resistance of geogrid with rough surface and small aperture is overestimated because of the influence of arch action.