A triaxial compression test is performed on a soil sample. The 'cell pressure' (σ3) is:
Choose the correct answer
The axial load applied by the ram
The confining (all-round) pressure acting on the sample from fluid in cell
The shear stress at failure
The deviator stress
Correct Answer
B. The confining (all-round) pressure acting on the sample from fluid in cell
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Triaxial test: cylindrical sample enclosed in rubber membrane inside a cell filled with water under cell pressure σ3 (confining/all-round pressure). Additional axial stress (deviator stress) σd applied until failure. At failure: σ1 = σ3 + σd. Mohr circle: centre at (σ3+σ1)/2, radius (σ1−σ3)/2. Failure envelope: τ = c + σ tan φ.
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