A clay specimen was tested in undrained direct shear, under a normal stress of 50 kPa. The peak shear stress measured was 32 kPa and the critical state shear stress measured was 22 kPa. What is the critical state undrained strength of the clay specimen? Express your answer in kPa, but write only the numeric answer in the text box

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Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.