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A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2 results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2 (with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.
Correct answer is between '1.7,1.8'. Can you explain this answer?
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Verified Answer
A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore...
Concept:
Pure pressure parameter (B)
σ3 = cell pressure
UC = pore pressure
Δσ3 = change in cell pressure in cell pressure stage
ΔUC = change in pore pressure in cell pressure stage
Pore pressure parameter (A)
ΔUd = change in pore in deviator state
Δσd = change in deviator stress
Calculation:
ΔUc = 5.75 - 4.5 = 1.25 kg/cm2
Δσ3 = 10 - 8 = 2 kg/cm2
ΔUd = 7.15 - 5.75 = 1.4 kg/cm2
Δσd = 6.25 kg/cm2
Most Upvoted Answer
A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore...
Given data:
- Initial cell pressure (σ'c) = 8 kg/cm2
- Initial pore water pressure (u) = 4.5 kg/cm2
- Final cell pressure (σ'c) = 10 kg/cm2
- Final pore water pressure (u) = 5.75 kg/cm2
- Deviator stress (σ'd) = 6.25 kg/cm2
- Final pore water pressure (u) under deviator stress = 7.15 kg/cm2
Calculation of B coefficient:
The B coefficient is defined as the ratio of the change in pore water pressure to the change in cell pressure during a consolidation test.
Δu = u_f - u_i = 5.75 kg/cm2 - 4.5 kg/cm2 = 1.25 kg/cm2
Δσ'c = σ'c_f - σ'c_i = 10 kg/cm2 - 8 kg/cm2 = 2 kg/cm2
B = Δu / Δσ'c
B = 1.25 kg/cm2 / 2 kg/cm2
B = 0.625
Calculation of A coefficient:
The A coefficient is defined as the ratio of the change in pore water pressure to the change in deviator stress during a consolidation test.
Δu = u_f - u_i = 7.15 kg/cm2 - 5.75 kg/cm2 = 1.4 kg/cm2
Δσ'd = σ'd_f - σ'd_i = 6.25 kg/cm2 - 0 kg/cm2 = 6.25 kg/cm2
A = Δu / Δσ'd
A = 1.4 kg/cm2 / 6.25 kg/cm2
A = 0.224
Calculation of B/A:
B/A = 0.625 / 0.224
B/A ≈ 2.79
Discussion:
The ratio of pore pressure coefficients B to A is approximately 2.79. However, the correct answer is stated to be between 1.7 and 1.8. This indicates that there may be an error in the calculations or data provided.
It is important to note that the B coefficient represents the change in pore water pressure per unit change in effective stress, while the A coefficient represents the change in pore water pressure per unit change in deviator stress. Both coefficients are measures of soil compressibility and drainage characteristics.
Further review of the calculations and data is recommended to ensure accuracy and determine the correct ratio of pore pressure coefficients.
- Initial cell pressure (σ'c) = 8 kg/cm2
- Initial pore water pressure (u) = 4.5 kg/cm2
- Final cell pressure (σ'c) = 10 kg/cm2
- Final pore water pressure (u) = 5.75 kg/cm2
- Deviator stress (σ'd) = 6.25 kg/cm2
- Final pore water pressure (u) under deviator stress = 7.15 kg/cm2
Calculation of B coefficient:
The B coefficient is defined as the ratio of the change in pore water pressure to the change in cell pressure during a consolidation test.
Δu = u_f - u_i = 5.75 kg/cm2 - 4.5 kg/cm2 = 1.25 kg/cm2
Δσ'c = σ'c_f - σ'c_i = 10 kg/cm2 - 8 kg/cm2 = 2 kg/cm2
B = Δu / Δσ'c
B = 1.25 kg/cm2 / 2 kg/cm2
B = 0.625
Calculation of A coefficient:
The A coefficient is defined as the ratio of the change in pore water pressure to the change in deviator stress during a consolidation test.
Δu = u_f - u_i = 7.15 kg/cm2 - 5.75 kg/cm2 = 1.4 kg/cm2
Δσ'd = σ'd_f - σ'd_i = 6.25 kg/cm2 - 0 kg/cm2 = 6.25 kg/cm2
A = Δu / Δσ'd
A = 1.4 kg/cm2 / 6.25 kg/cm2
A = 0.224
Calculation of B/A:
B/A = 0.625 / 0.224
B/A ≈ 2.79
Discussion:
The ratio of pore pressure coefficients B to A is approximately 2.79. However, the correct answer is stated to be between 1.7 and 1.8. This indicates that there may be an error in the calculations or data provided.
It is important to note that the B coefficient represents the change in pore water pressure per unit change in effective stress, while the A coefficient represents the change in pore water pressure per unit change in deviator stress. Both coefficients are measures of soil compressibility and drainage characteristics.
Further review of the calculations and data is recommended to ensure accuracy and determine the correct ratio of pore pressure coefficients.
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A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer?
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A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer?.
A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer?.
Solutions for A soil sample was consolidated under a cell pressure of 8 kg/cm2, pore water pressure of 4.5 kg/cm2. With no drainage permitted the cell pressure was raised to 10 kg/cm2results in increased pore water pressure to 5.75 kg/cm2. The axial load was then increased to give a deviator stress of 6.25 kg/cm2(with the cell pressure at 10 kg/cm2), pore pressure is now noted to be 7.15 kg/cm2. The ratio of pore pressure coefficients B to A is ______.Correct answer is between '1.7,1.8'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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