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In an unconsolidated undrained triaxial test, it is observed that an increase in cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that, an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton’s pore pressure parameter B is:
  • a)
    0.5
  • b)
    0.625
  • c)
    0.8
  • d)
    1.0
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
In an unconsolidated undrained triaxial test, it is observed that an i...
's pore pressure coefficient (B) for the soil can be calculated as follows:

B = (Δu/Δσ')/(Δu/Δσ' + Δu/Δp')

where:
Δu = change in pore pressure (80 kPa)
Δσ' = change in effective stress (100 kPa, calculated as the difference between the cell pressure and the confining pressure)
Δp' = change in mean effective stress (50 kPa, calculated as half of the change in deviatoric stress)

Plugging in the values, we get:

B = (80/100)/(80/100 + 25/50)
B = 0.7619

Therefore, the Skempton's pore pressure coefficient (B) for the soil is approximately 0.76.
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In an unconsolidated undrained triaxial test, it is observed that an increase in cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that, an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton’s pore pressure parameter B is:a)0.5b)0.625c)0.8d)1.0Correct answer is option 'C'. Can you explain this answer?
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In an unconsolidated undrained triaxial test, it is observed that an increase in cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that, an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton’s pore pressure parameter B is:a)0.5b)0.625c)0.8d)1.0Correct answer is option 'C'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In an unconsolidated undrained triaxial test, it is observed that an increase in cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that, an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton’s pore pressure parameter B is:a)0.5b)0.625c)0.8d)1.0Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an unconsolidated undrained triaxial test, it is observed that an increase in cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that, an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton’s pore pressure parameter B is:a)0.5b)0.625c)0.8d)1.0Correct answer is option 'C'. Can you explain this answer?.
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