Consider a 2-D object consisting of two triangle compartments, as shown in Figure P9.4. Suppose a solution containing a 511 KeV gamma ray emitting radionuclide with concentration f = 0.5….
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?