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The reinforcement effect of geogrids is exerted through the fixing and occlusion with the surrounding soil to ensure the stability of reinforced structure. Based on the friction reinforced mechanism, the geogrids play the role of anti-shear and anti-pulling. So the indexes of interface strength identified by shear and tensile tests are usually used to conduct the stability analysis of reinforced structure. At present, the same indexes of interface strength are adopted in the stability analysisdoi:10.4236/wjet.2018.62023 fatcat:kqbr6ikn3zcchmeaiojwb6ujy4