Geogrids, the most common geosynthetic material, has been widely used to strengthen and protect the structure, and enhance the overall stability of the soil. This paper presented a new reinforce-ment method by using HDPE circular aperture geogrids. To evaluate the properties of new circular aper-ture geogrid, a series of large-scale direct shear tests and pull-out tests were conducted on the circular ap-erture geogrids as well as biaxial geogrids (rectangular aperture). Further, comparative analysis of test results between the two kinds of geogrids was carried out. Based on the large-scale direct shear tests, the relationship between the local shear stress and the displacement of the reinforced soil was studied. Meanwhile the pull-out stress-displacement behaviors of geogrid-soil interface were studied through the large-scale pull-out tests. Both results of two laboratory tests reflected that the circular aperture geogrids performed better than the biaxial geogrids. At the same mesh size, circular aperture geogrid could con-tribute more geogrid-aggregate interlock affection than rectangular aperture geogrid. As the result, ge-ogrid-soil interface strength was greatly improved. Moreover, residual resistance was determined on the basis of the test results. The results also showed that circular aperture geogrids preformed higher and more stable residual resistance than the biaxial geogrids.
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