부산대학교 도서관

In this study, pullout tests of geogrid embedded in banking material were performed, in order to establish the design procedure of GRS integral bridge. The effect of cyclic loading as well as the confining pressure was mainly focused on in these tests. The experiments revealed that although the pullout stiffness of geogrid at the initial state was much larger than the tensile stiffness obtained by in-isolation tests, it was reduced largely by the large number of cyclic loadings and finally it became at the same level as that obtained by in-isolation tests. This is due to the reduction of interlocking effect mobilized between the geogrid and surrounding soil, and the increase of the stretching region of the geogrid. Based on these test results, new method to predict the pullout stiffness of the geogrid under different confining pressure was suggested.