Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Consider the following statements:P.For a cla...
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Consider the following statements:
P. For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.
Q. If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.
R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.
S. Local shear failure occurs in soft clays and loose sands.
Identify the correct option:
- a)P-False, Q-True, R-True, S-False
- b)P-True, Q-False, R-False, S-True
- c)P-True, Q-False, R-True, S-False
- d)P-False, Q-True, R-False, S-True
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the following statements:P.For a clay layer, the net ultimate...
SKEMPTON’S Method:
This theory is applicable only for C-soils but it can be applied for shallow and deep footings both. In this theory, base resistance and side resistance both are considered. The net ultimate bearing capacity is given by:
qnu=CNc
Where,
Nc = Skempton’s bearing capacity factor which depends upon Df/B ratio
Hence for a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is directly proportional to the cohesion of the soil.
Case 1: When Df/B = 0,
Nc = 5.0 (strip footing)
= 6.0 (Square/Circular/Rectangular/ Raft)
Case 2: When 0 Df/B < 2.5
Case 3: When
Case 2: When 0 Df/B < 2.5
Case 3: When
Nc = 7.5 (Strip footing)
Nc = 9.0 (Square/circular/rectangular/raft)
Therefore, when B = Df , case 2 is valid
Local shear failure:
This type of failure is seen in relatively loose sand and soft clay.
Some characteristics of local shear failure are:
1. Failure is not sudden and there is no tilting of footing.
2. Failure surface does not reach the ground surface and slight bulging of soil around the footing is observed
3. Failure surface is not well defined
4. Failure is progressive
5. In load-settlement curve, there is no well-defined peak
6. Failure is characterized by considerable settlement directly beneath the foundation
7. A significant compression of soil below the footing and partial development of plastic equilibrium is observed.
8. Well-defined wedge and slip surfaces only beneath the foundation.
Most Upvoted Answer
Consider the following statements:P.For a clay layer, the net ultimate...
P-False, Q-True, R-False, S-True
Explanation:
Statement P: For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.
This statement is false. The net ultimate bearing capacity of a clay layer is not independent of the cohesion of the soil. The cohesion of the soil plays a significant role in determining the bearing capacity. The net ultimate bearing capacity of a clay layer is given by the equation:
qnu = cNc + qNq + 0.5γBNγ
Where:
- qnu is the net ultimate bearing capacity
- c is the cohesion of the soil
- γ is the unit weight of the soil
- Nc, Nq, and Nγ are the bearing capacity factors for cohesion, surcharge, and unit weight, respectively.
Statement Q: If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by Skempton is taken to be 6.0.
This statement is true. When the depth of the strip footing is equal to the width of the footing, the bearing capacity factor Nc by Skempton is taken to be 6.0. This is based on empirical observations and is used as a simplification in calculations.
Statement R: The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.
This statement is false. The theory given by Skempton for net ultimate bearing capacity computations is valid for both shallow and deep footings. Skempton's theory provides a method to calculate the net ultimate bearing capacity of a foundation based on various factors such as soil properties, geometry of the footing, and loading conditions.
Statement S: Local shear failure occurs in soft clays and loose sands.
This statement is true. Local shear failure occurs in soft clays and loose sands due to the low shear strength of these soils. Local shear failure is characterized by the development of shear surfaces within the soil mass, resulting in a sudden drop in the bearing capacity and potentially leading to the failure of the foundation. It is important to consider the shear strength of the soil when designing foundations in these types of soils.
In summary, the correct option is P-False, Q-True, R-False, S-True.
Explanation:
Statement P: For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.
This statement is false. The net ultimate bearing capacity of a clay layer is not independent of the cohesion of the soil. The cohesion of the soil plays a significant role in determining the bearing capacity. The net ultimate bearing capacity of a clay layer is given by the equation:
qnu = cNc + qNq + 0.5γBNγ
Where:
- qnu is the net ultimate bearing capacity
- c is the cohesion of the soil
- γ is the unit weight of the soil
- Nc, Nq, and Nγ are the bearing capacity factors for cohesion, surcharge, and unit weight, respectively.
Statement Q: If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by Skempton is taken to be 6.0.
This statement is true. When the depth of the strip footing is equal to the width of the footing, the bearing capacity factor Nc by Skempton is taken to be 6.0. This is based on empirical observations and is used as a simplification in calculations.
Statement R: The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.
This statement is false. The theory given by Skempton for net ultimate bearing capacity computations is valid for both shallow and deep footings. Skempton's theory provides a method to calculate the net ultimate bearing capacity of a foundation based on various factors such as soil properties, geometry of the footing, and loading conditions.
Statement S: Local shear failure occurs in soft clays and loose sands.
This statement is true. Local shear failure occurs in soft clays and loose sands due to the low shear strength of these soils. Local shear failure is characterized by the development of shear surfaces within the soil mass, resulting in a sudden drop in the bearing capacity and potentially leading to the failure of the foundation. It is important to consider the shear strength of the soil when designing foundations in these types of soils.
In summary, the correct option is P-False, Q-True, R-False, S-True.
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Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer?
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Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. 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 Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. 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 Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer?.
Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. 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 Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. 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 Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Consider the following statements:P.For a clay layer, the net ultimate bearing capacity (By Skempton) at the base of the footing is independent of the cohesion of the soil.Q.If the depth of the strip footing is equal to the width of the footing, then the value of bearing capacity factor (Nc) by skempton is taken to be 6.0.R. The theory given by Skempton for net ultimate bearing capacity computations is valid for shallow footings only.S.Local shear failure occurs in soft clays and loose sands.Identify the correct option:a)P-False, Q-True, R-True, S-Falseb)P-True, Q-False, R-False, S-Truec)P-True, Q-False, R-True, S-Falsed)P-False, Q-True, R-False, S-TrueCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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