3.20. Using the approach indicated by Figures 3.12 and 3.13. delermine the number. spacing,
and length of the geogrids needed to stabilize the embankment shown in the diagram
below using a faclor of safety of 1.3. Use combined reduction factors of 4.3 on the ultimate
geogrid strength of the candidate geogrid of 180 kN/m to arrive at an allowable
strength.