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In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)
Correct answer is '75'. Can you explain this answer?
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In a triaxial unconsolidated undrained (UU) test on a saturated clay s...
UU test for clay (ϕ = 0)
σd = 150 kPa
σ3 = 100 kPa
σ1 = σ3 + σd = 250 kPa
∴
250 = 100 + 2C
C = 75 kPa
Shear strength,
σd = 150 kPa
σ3 = 100 kPa
σ1 = σ3 + σd = 250 kPa
∴
250 = 100 + 2C
C = 75 kPa
Shear strength,
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In a triaxial unconsolidated undrained (UU) test on a saturated clay s...
Triaxial Unconsolidated Undrained (UU) Test:
In a triaxial unconsolidated undrained (UU) test, the soil sample is subjected to an axial load without allowing any drainage of water. This test is commonly used to determine the undrained shear strength of saturated cohesive soils.
Given Information:
- Cell pressure (σ3) = 100 kPa
- Deviatoric stress at failure (σ1 - σ3) = 150 kPa
Calculating Undrained Shear Strength:
The undrained shear strength of the soil can be determined using the equation:
Su = (σ1 - σ3) / 2
where Su represents the undrained shear strength, σ1 is the major principal stress, and σ3 is the minor principal stress.
In this case, the deviatoric stress at failure is given as 150 kPa, which represents the difference between the major and minor principal stresses. Since the minor principal stress (σ3) is given as 100 kPa, we can substitute these values into the equation to calculate the undrained shear strength (Su):
Su = (150 kPa - 100 kPa) / 2
Su = 50 kPa / 2
Su = 25 kPa
However, the correct answer is given as 75 kPa. This discrepancy may be due to a typographical error or misunderstanding in the question. If the deviatoric stress at failure is indeed 150 kPa and the cell pressure is 100 kPa, then the calculated undrained shear strength would be 25 kPa, not 75 kPa.
Conclusion:
Based on the given information, the undrained shear strength of the soil sample in the triaxial unconsolidated undrained (UU) test is 25 kPa, not 75 kPa.
In a triaxial unconsolidated undrained (UU) test, the soil sample is subjected to an axial load without allowing any drainage of water. This test is commonly used to determine the undrained shear strength of saturated cohesive soils.
Given Information:
- Cell pressure (σ3) = 100 kPa
- Deviatoric stress at failure (σ1 - σ3) = 150 kPa
Calculating Undrained Shear Strength:
The undrained shear strength of the soil can be determined using the equation:
Su = (σ1 - σ3) / 2
where Su represents the undrained shear strength, σ1 is the major principal stress, and σ3 is the minor principal stress.
In this case, the deviatoric stress at failure is given as 150 kPa, which represents the difference between the major and minor principal stresses. Since the minor principal stress (σ3) is given as 100 kPa, we can substitute these values into the equation to calculate the undrained shear strength (Su):
Su = (150 kPa - 100 kPa) / 2
Su = 50 kPa / 2
Su = 25 kPa
However, the correct answer is given as 75 kPa. This discrepancy may be due to a typographical error or misunderstanding in the question. If the deviatoric stress at failure is indeed 150 kPa and the cell pressure is 100 kPa, then the calculated undrained shear strength would be 25 kPa, not 75 kPa.
Conclusion:
Based on the given information, the undrained shear strength of the soil sample in the triaxial unconsolidated undrained (UU) test is 25 kPa, not 75 kPa.
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In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. Can you explain this answer?
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In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. 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 In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. 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 In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. Can you explain this answer?.
In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. 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 In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. 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 In a triaxial unconsolidated undrained (UU) test on a saturated clay sample, the cell pressure was 100 kPa, If the deviatoric stress at failure was 150 kPa, then the undrained shear strength of the soil is_________ kPa. (in integer)Correct answer is '75'. Can you explain this answer?.
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