Abstract
It is approved that retaining walls, reinforced by geogrid, have considerable earthquake resistance. Thus, it can be also effective to use a reinforced earth work by geogrid in harbor structures (for example, sheetpile quaywall). It is important to obtain friction characteristics in order to consider reinforcement effects by interaction of mesh of geogrid and soil particles. In this study, pull-out tests are conducted with defferent soil particles sizes or surface loads, in order to obtain the friction characteristic due to the interaction of a geogrid and backfill. The results show that larger friction angles can be obtained by usuing a backfill of smaller soil particles.
