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In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively are
- a)0 and 150 kN/m2
- b)up>(b) 100 kN/m2 and 50 kN/m2
- c)150 kN/m2 and 0
- d)50 kN/m2 and 100 kN/m2
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
In an Oedometer apparatus, a specimen of fully saturated clay has bee...
Introduction:
In an Oedometer apparatus, a fully saturated clay specimen is subjected to consolidation under a vertical pressure. The question asks for the effective stress and pore water pressure immediately after increasing the vertical stress.
Explanation:
1. Effective stress:
The effective stress is the stress carried by the solid particles in the soil skeleton. It is calculated by subtracting the pore water pressure from the total stress.
2. Pore water pressure:
Pore water pressure is the pressure exerted by the water present in the void spaces of the soil.
3. Initial conditions:
- The clay specimen is fully saturated, implying that all the void spaces are filled with water.
- The clay specimen is at equilibrium under a vertical pressure of 50 kN/m2.
4. Effect of increasing the vertical stress:
When the vertical stress is increased from 50 kN/m2 to 150 kN/m2, the following changes occur:
- The total stress (σ) increases from 50 kN/m2 to 150 kN/m2.
- The effective stress (σ') also increases because it is directly proportional to the total stress.
- The pore water pressure (u) remains constant because the clay specimen is fully saturated and there is no change in the water content.
5. Calculation:
- Since the pore water pressure remains constant, the answer cannot be option 'A' or 'B' because they have incorrect values for the pore water pressure.
- The effective stress increases from 50 kN/m2 to 150 kN/m2, so the answer cannot be option 'C'.
- Therefore, the correct answer is option 'D' because it correctly states that the effective stress is 50 kN/m2 and the pore water pressure is 100 kN/m2 after increasing the vertical stress.
Conclusion:
After increasing the vertical stress from 50 kN/m2 to 150 kN/m2 in the Oedometer apparatus, the effective stress remains at 50 kN/m2 and the pore water pressure increases to 100 kN/m2.
In an Oedometer apparatus, a fully saturated clay specimen is subjected to consolidation under a vertical pressure. The question asks for the effective stress and pore water pressure immediately after increasing the vertical stress.
Explanation:
1. Effective stress:
The effective stress is the stress carried by the solid particles in the soil skeleton. It is calculated by subtracting the pore water pressure from the total stress.
2. Pore water pressure:
Pore water pressure is the pressure exerted by the water present in the void spaces of the soil.
3. Initial conditions:
- The clay specimen is fully saturated, implying that all the void spaces are filled with water.
- The clay specimen is at equilibrium under a vertical pressure of 50 kN/m2.
4. Effect of increasing the vertical stress:
When the vertical stress is increased from 50 kN/m2 to 150 kN/m2, the following changes occur:
- The total stress (σ) increases from 50 kN/m2 to 150 kN/m2.
- The effective stress (σ') also increases because it is directly proportional to the total stress.
- The pore water pressure (u) remains constant because the clay specimen is fully saturated and there is no change in the water content.
5. Calculation:
- Since the pore water pressure remains constant, the answer cannot be option 'A' or 'B' because they have incorrect values for the pore water pressure.
- The effective stress increases from 50 kN/m2 to 150 kN/m2, so the answer cannot be option 'C'.
- Therefore, the correct answer is option 'D' because it correctly states that the effective stress is 50 kN/m2 and the pore water pressure is 100 kN/m2 after increasing the vertical stress.
Conclusion:
After increasing the vertical stress from 50 kN/m2 to 150 kN/m2 in the Oedometer apparatus, the effective stress remains at 50 kN/m2 and the pore water pressure increases to 100 kN/m2.
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In an Oedometer apparatus, a specimen of fully saturated clay has bee...
Increase in vertical stress (∆σ) = 150 - 50 = 100 kN/m2
Clay soil is saturated and no shearing, so
∆σ = Pore water pressure increase
∆P = 100 kN/m2
The soil is in equilibrium at 50 kN/m2.
The initial pore water pressure = 0
Final pore water pressure = 100 + 0 = 100 kN/m2
Effective stress = Total stress - Pore water pressure = 150 - 100 = 50 kN/m
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In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer?
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In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer?.
In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2 respectively area)0 and 150 kN/m2b)up>(b) 100 kN/m2 and 50 kN/m2c)150 kN/m2 and 0d)50 kN/m2 and 100 kN/m2Correct answer is option 'D'. Can you explain this answer?.
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