During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm2 to 0.26 N/mm2, the pore water pressure increases from 0.07 N/mm2 to 0.15 N/mm2. Skempton’s pore pressure parameter B is
A. 0.5
B. -0.5
C. 2.0
D. -2.0
Answer: Option A
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A. directly proportional to time and inversely proportional to drainage path
B. directly proportional to time and inversely proportional to square of drainage path
C. directly proportional to drainage path and inversely proportional to time
D. directly proportional to square of drainage path and inversely proportional to time
B=Δu/Δσ' where, Δu=change in pore pressure and Δσ'= change in effective stress
Δu= 0.15-0.07= 0.08
Δσ'= 0.26-0.10= 0.16
B= 0.5