## how many layers of geogrid are required to raise the factor of safety to 1.4?

An existing roadside embankment needs to be reinforced using

geogrid sheets. The embankment is 15-m high and the slope angle

is 40°. The in situ soil will be used as the reinforced backfill. The

soil strength parameters are f = 220 and c = 15 kN∕m² in both the

embankment and foundation sections. The unit weight is 17.3 kN∕m³.

The critical failure surface is assumed to be a toe circle, and the center

is located at (+3 m, +18 m) with respect to the toe at (0,0). Assume

the groundwater table is far below the foundation. The ultimate

tensile strength of the geogrid is 75 kN∕m. The vertical spacing is

chosen to be 40 cm. For the critical failure circle, how many layers of

geogrid are required to raise the factor of safety to 1.4?

### Explain why of length-of-bend to sheet thickness increases.

As noted in Fig. 7.16, the state of stress shifts from plane stress to plane strain as the ratio   of length-of-bend to sheet thickness increases. Explain why. This situation….

### Describe the material properties that have an effect on the relative position of the curves shown in Fig. 7.19.

Describe the material properties that have an effect on the relative position of the curves   shown in Fig. 7.19. Observing curves (a) and (c) in Fig. 7.19 on p…..

### Why do tubes have a tendency to buckle when bent?

Why do tubes have a tendency to buckle when bent? Experiment with a straight soda straw, and describe your observations. Recall that, in bending of any section, one-half of the….