Effective Stress Analysis. The effective stress analysis uses the drained shear strength (c′ and f′)
of the plastic soil. The drained shear strength could be obtained from triaxial compression tests with
pore water pressure measurements performed on saturated specimens of the plastic soil. This analysis
is termed a long-term analysis because the shear induced pore water pressures (positive or negative)
from the loading have dissipated and the hydrostatic pore water conditions now prevail in the
field. Because an effective stress analysis is being performed, the location of the groundwater table
must be considered in the analysis (use Eq. 6.7).