Abstract
In order to confirm the effect of the opening size and laying position of geogrid on the base course, we conducted a box shear test. In the box shear test, two types of geogrids, TX160 and SS2, were used for the case which the distance between the laying position and the shear plane was 0 cm, 3 cm, 5 cm, and 7 cm. Although the restraining effect of TX 160 was demonstrated to about 5 cm from the laying position, it was confirmed that the restraining effect of SS 2 was hardly demonstrated in the range of 3 cm or more from the laying position. As a result, it was found that the range in which the constraining effect is exhibited varies depending on the opening size of the geogrid.
