GATE CE 2024 Set 1 — Question 55
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Geotechnical Engineering → Effective Stress & Compaction → Pore Water Pressure
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Question
A soil sample was consolidated at a cell pressure of and a back pressure of for 24 hours during a consolidated undrained (CU) triaxial test. The cell pressure was increased to on the next day and it resulted in the development of pore water pressure of . The soil sample failed when the axial stress was gradually increased to . The pore water pressure at failure was recorded as . The value of Skempton’s pore pressure parameter for the soil sample is ______________ (rounded off to 2 decimal places).
Correct answer
0.09 to 0.11
Solution
Skempton's pore pressure parameter is defined as the ratio of the change in pore water pressure () to the change in cell pressure () under undrained conditions:From the problem data:
- Initial cell pressure,
- Final cell pressure,
- Change in cell pressure,
- Resulting change in pore water pressure,
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