Q. During a site investigation for a new building, which test is most commonly used to determine the bearing capacity of the soil?
A.
Standard Penetration Test (SPT)
B.
Cone Penetration Test (CPT)
C.
Unconfined Compression Test
D.
Atterberg Limits Test
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Solution
The Cone Penetration Test (CPT) is widely used in site investigations to assess the bearing capacity of soil.
Correct Answer:
B
— Cone Penetration Test (CPT)
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Q. In a case study involving a deep foundation, which factor is most critical for its design?
A.
Soil stratigraphy
B.
Foundation material
C.
Construction method
D.
Load type
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Solution
Soil stratigraphy is crucial for deep foundation design as it affects load transfer and bearing capacity.
Correct Answer:
A
— Soil stratigraphy
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Q. In a case study, a foundation is failing due to excessive settlement. Which soil property is most likely to be the cause?
A.
High shear strength
B.
Low permeability
C.
High compressibility
D.
Low plasticity
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Solution
High compressibility of the soil can lead to excessive settlement under load, which is a common issue in foundation failures.
Correct Answer:
C
— High compressibility
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Q. In a case study, a retaining wall is experiencing lateral earth pressure. Which factor is most critical in determining the wall's stability?
A.
Soil cohesion
B.
Wall height
C.
Backfill angle
D.
Drainage conditions
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Solution
The backfill angle significantly affects the lateral earth pressure acting on the retaining wall, impacting its stability.
Correct Answer:
D
— Drainage conditions
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Q. In a case study, what is the purpose of performing a plate load test?
A.
To determine soil permeability
B.
To assess soil shear strength
C.
To evaluate bearing capacity
D.
To measure consolidation rate
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Solution
A plate load test is specifically designed to evaluate the bearing capacity of soil under a given load.
Correct Answer:
C
— To evaluate bearing capacity
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Q. In a consolidation case study, what is the primary mechanism by which soil settles over time?
A.
Shear failure
B.
Volume change due to pore water expulsion
C.
Plastic deformation
D.
Elastic rebound
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Solution
Consolidation involves volume change due to the expulsion of pore water, leading to settlement over time.
Correct Answer:
B
— Volume change due to pore water expulsion
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Q. What is the effect of a high water table on the bearing capacity of soil in a case study?
A.
Increases bearing capacity
B.
Decreases bearing capacity
C.
No effect
D.
Depends on soil type
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Solution
A high water table generally decreases the effective stress in the soil, leading to a reduction in bearing capacity.
Correct Answer:
B
— Decreases bearing capacity
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Q. What is the primary concern when designing a foundation on expansive clay in a case study?
A.
Frost heave
B.
Settlement
C.
Lateral movement
D.
Swelling and shrinkage
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Solution
Expansive clay is known for its swelling and shrinkage behavior, which poses significant challenges for foundation design.
Correct Answer:
D
— Swelling and shrinkage
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Q. What is the primary factor affecting the bearing capacity of soil in a case study involving shallow foundations?
A.
Soil type
B.
Water table level
C.
Foundation depth
D.
All of the above
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Solution
The bearing capacity of soil is influenced by soil type, water table level, and foundation depth, making all of these factors critical in case studies.
Correct Answer:
D
— All of the above
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Q. Which method is commonly used to estimate the ultimate bearing capacity of a shallow foundation in a case study?
A.
Terzaghi's equation
B.
Mohr-Coulomb failure criterion
C.
Rankine's earth pressure theory
D.
Boussinesq's equation
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Solution
Terzaghi's equation is a widely accepted method for estimating the ultimate bearing capacity of shallow foundations.
Correct Answer:
A
— Terzaghi's equation
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