Shear Strength of Unsaturated Soils - Unsaturated Soil Mechanics in Engineering Practice - page 573

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Figure 11.70 Results of constant-water-content triaxial tests under different net confining
stresses but with the same initial matric suction of 100 kPa: (a) deviator stress versus strain;
(b) volume change versus strain; (c) change in pore-water pressure versus strain.