Raft foundations are recommended in these circumstances:
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A.
If the soil has a high level of load-bearing capacity
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B.
If the load is distributed uniformly
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C.
When building a building on a rock-like surface.
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D.
When differential settlement needs to be reduced
Correct Answer:
D. When differential settlement needs to be reduced
Explanation:
The correct answer is when differential settlement needs to be reduced.
A raft or mat foundation is a continuous concrete slab that covers the entire area beneath a structure, supporting all columns and walls. This design is particularly effective when dealing with soft or inconsistent soil conditions where individual footings might settle at different rates. By spreading the building's total load over a larger surface area, the raft foundation helps distribute weight more evenly, thereby minimizing the risk of differential settlement and preventing structural cracks or instability. Additionally, it is often utilized when the total area of traditional individual footings would exceed half of the building's footprint.
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