Strength Theory Model of Unsaturated Soils with Suction Stress Concept

Figure 3

The curves of effective normal stress and shear strength at different initial water content state of soil (experimental data from Vanapalli et al. [10]).

(a) Modified shear strength envelops at drier than optimum water content

(b) Modified shear strength envelops at wetter than optimum water content

(c) Modified shear strength envelops at optimum water content