Question: The specimens obtained from a clay layer at a site gave the following shear strength parameters from a consolidated-drained triaxial test: c' = 10 kN/m

The specimens obtained from a clay layer at a site gave the following shear strength parameters from a consolidated-drained triaxial test: c' = 10 kN/m² and ϕ' = 26°. A consolidated undrained triaxial test is carried out on this soil, where a specimen is consolidated under confining pressure of 100 kN/m² and loaded under undrained conditions. The specimen failed under an additional axial stress of 107.0 kN/m². What is the pore water pressure within the specimen?

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