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The undrained cohesion of a remoulded clay soil is 10 kN/m2. If the sensitivity of the clay is 20, then the corresponding remoulded compressive strength (in kN/m2) is (Answer up to the nearest integer)
Correct answer is '20'. Can you explain this answer?
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The undrained cohesion of a remoulded clay soil is 10 kN/m2. If the s...
Undrained cohesion of the remolded clay = Cu = 10 kN/m2
Remoulded compressive strength qu = 2Cu
= 2 × 10 = 20 kN/m2
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The undrained cohesion of a remoulded clay soil is 10 kN/m2. If the s...
Undrained Cohesion and Sensitivity
Definition:
- The undrained cohesion of a soil is a measure of its shear strength when it is under undrained conditions, meaning that there is no excess pore water pressure dissipation.
- The sensitivity of a soil is a measure of its sensitivity to changes in stress conditions, particularly changes in effective stress.
Given Information:
- Undrained cohesion of the remoulded clay soil = 10 kN/m2
- Sensitivity of the clay = 20
Explanation:
1. Relationship between Undrained Cohesion and Compressive Strength:
- In clay soils, the undrained cohesion is closely related to the unconfined compressive strength (UCS) of the soil.
- The undrained cohesion can be considered as an indication of the soil's shear strength under undrained conditions, while the UCS represents the soil's resistance to compression.
2. Relationship between Sensitivity and Compressive Strength:
- Sensitivity is defined as the ratio of the undrained shear strength of a normally consolidated soil to its remolded shear strength.
- The remolded shear strength is the shear strength of the soil after it has been remolded or disturbed.
- The sensitivity of a soil is an indicator of its compressibility and its susceptibility to volume changes.
3. Calculation:
- In this case, the undrained cohesion of the remoulded clay soil is given as 10 kN/m2.
- The sensitivity of the clay is given as 20.
- The sensitivity, S, is calculated as:
S = (Undrained shear strength of normally consolidated clay) / (Undrained shear strength of remoulded clay)
20 = (Undrained shear strength of normally consolidated clay) / 10 kN/m2
Undrained shear strength of normally consolidated clay = 20 * 10 kN/m2 = 200 kN/m2
4. Conclusion:
- The corresponding remoulded compressive strength can be considered as the undrained shear strength of the remoulded clay soil.
- Therefore, the remoulded compressive strength is also 10 kN/m2, which is the same as the undrained cohesion value given in the question.
- Hence, the correct answer is 20, which is the nearest integer to the remoulded compressive strength value.
Definition:
- The undrained cohesion of a soil is a measure of its shear strength when it is under undrained conditions, meaning that there is no excess pore water pressure dissipation.
- The sensitivity of a soil is a measure of its sensitivity to changes in stress conditions, particularly changes in effective stress.
Given Information:
- Undrained cohesion of the remoulded clay soil = 10 kN/m2
- Sensitivity of the clay = 20
Explanation:
1. Relationship between Undrained Cohesion and Compressive Strength:
- In clay soils, the undrained cohesion is closely related to the unconfined compressive strength (UCS) of the soil.
- The undrained cohesion can be considered as an indication of the soil's shear strength under undrained conditions, while the UCS represents the soil's resistance to compression.
2. Relationship between Sensitivity and Compressive Strength:
- Sensitivity is defined as the ratio of the undrained shear strength of a normally consolidated soil to its remolded shear strength.
- The remolded shear strength is the shear strength of the soil after it has been remolded or disturbed.
- The sensitivity of a soil is an indicator of its compressibility and its susceptibility to volume changes.
3. Calculation:
- In this case, the undrained cohesion of the remoulded clay soil is given as 10 kN/m2.
- The sensitivity of the clay is given as 20.
- The sensitivity, S, is calculated as:
S = (Undrained shear strength of normally consolidated clay) / (Undrained shear strength of remoulded clay)
20 = (Undrained shear strength of normally consolidated clay) / 10 kN/m2
Undrained shear strength of normally consolidated clay = 20 * 10 kN/m2 = 200 kN/m2
4. Conclusion:
- The corresponding remoulded compressive strength can be considered as the undrained shear strength of the remoulded clay soil.
- Therefore, the remoulded compressive strength is also 10 kN/m2, which is the same as the undrained cohesion value given in the question.
- Hence, the correct answer is 20, which is the nearest integer to the remoulded compressive strength value.
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The undrained cohesion of a remoulded clay soil is 10 kN/m2. If the sensitivity of the clay is 20, then the corresponding remoulded compressive strength (in kN/m2) is (Answer up to the nearest integer)Correct answer is '20'. Can you explain this answer?
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