For a normally consolidated insensitive clay 0_CD= 30°. Deviator stress at failure of the same soil is 250 kN/m2 in CU test. If Skempton's A-parameter at failure is 0.62, find out the confining pressure during the consolidation state. a 280 b. 260 c. 270 d. 250

‹ample 9.1: Following results were recorded from a consolidation test on a specime turated clay, each load being maintained constant for 24 hours before the addition o ext increment.

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A normally consolidated clay sample, which is fully saturated, was consolidated in thetriaxial cell under a particular all-round pressure of σ3. Upon consolidation, drainage valve isclosed and σ3 is kept constant while deviatoric stress was gradually increased under undrainedcondition until failure is reached. The following results are obtained: ½ (σ1 – σ3) = 1/3 σ3 and ½ (σ1′ + σ3′) = 2/3 σ3a) Determine φ′,b) Express the pore pressure, uf, at failure in terms of cell pressure,c) Determine pore pressure coefficient Af′ at failured) Show that if sample is sheared under drained conditions, following results mayobtained: ½ (σ1 – σ3) = σ3 and ½ (σ1′ + σ3′) = 2σ3