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Permissible settlement is relatively higher for
- a)rafts on clays
- b)isolated footings on sands
- c)isolated footings on clays
- d)rafts on sands
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Permissible settlement is relatively higher fora)rafts on claysb)isola...
IS code specification for permissible settlement:
(1) Total Permissible settlement:
For isolated footing on clay = 65 mm
For isolated footing on sand = 40 mm
For raft foundation on clay = 65-100 mm
For raft foundation on sand = 40-65 mm
For isolated footing on clay = 65 mm
For isolated footing on sand = 40 mm
For raft foundation on clay = 65-100 mm
For raft foundation on sand = 40-65 mm
(2) Permissible Differential settlement:
For isolated fotting on clay = 40 mm
For isolated footing on sand = 25 mm
From above data, it is observed that, total permissible settlement is higher for raft foundation on clay.
For isolated fotting on clay = 40 mm
For isolated footing on sand = 25 mm
From above data, it is observed that, total permissible settlement is higher for raft foundation on clay.
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Permissible settlement is relatively higher fora)rafts on claysb)isola...
Permissible Settlement for Rafts on Clays
Raft foundation is a type of foundation that covers the entire area beneath the structure. It is used when the soil beneath the structure is weak and cannot withstand the load of the building. The permissible settlement of a foundation is the amount of settlement that can be allowed without causing any damage to the structure. The permissible settlement depends on the type of soil and the type of foundation.
Clay soils are cohesive soils that have low permeability and high compressibility. The settlement of a foundation on clay soil is more than that on sandy soil. The permissible settlement for a raft foundation on clay soil is relatively higher than that on other types of foundations. This is because the raft foundation spreads the load over a larger area, reducing the stress on the soil.
Factors Affecting Permissible Settlement for Rafts on Clays
There are several factors that affect the permissible settlement for a raft foundation on clay soil. Some of these factors are:
1. Soil Type: The type of soil on which the foundation is built plays a significant role in determining the permissible settlement. Clay soils have high compressibility and low bearing capacity, which can lead to higher settlement.
2. Foundation Type: The type of foundation used also affects the permissible settlement. Raft foundation spreads the load over a larger area, reducing the stress on the soil.
3. Building Height and Load: The height and load of the building also affect the permissible settlement. A taller building with a heavier load will cause more settlement than a shorter building with a lighter load.
4. Water Table: The water table level also affects the permissible settlement. If the water table is high, it can lead to soil consolidation and settlement.
Conclusion
In conclusion, the permissible settlement for a raft foundation on clay soil is relatively higher than that on other types of foundations. This is because the raft foundation spreads the load over a larger area, reducing the stress on the soil. The permissible settlement depends on several factors such as soil type, foundation type, building height and load, and water table level. It is important to consider these factors while designing a foundation to ensure the safety and stability of the structure.
Raft foundation is a type of foundation that covers the entire area beneath the structure. It is used when the soil beneath the structure is weak and cannot withstand the load of the building. The permissible settlement of a foundation is the amount of settlement that can be allowed without causing any damage to the structure. The permissible settlement depends on the type of soil and the type of foundation.
Clay soils are cohesive soils that have low permeability and high compressibility. The settlement of a foundation on clay soil is more than that on sandy soil. The permissible settlement for a raft foundation on clay soil is relatively higher than that on other types of foundations. This is because the raft foundation spreads the load over a larger area, reducing the stress on the soil.
Factors Affecting Permissible Settlement for Rafts on Clays
There are several factors that affect the permissible settlement for a raft foundation on clay soil. Some of these factors are:
1. Soil Type: The type of soil on which the foundation is built plays a significant role in determining the permissible settlement. Clay soils have high compressibility and low bearing capacity, which can lead to higher settlement.
2. Foundation Type: The type of foundation used also affects the permissible settlement. Raft foundation spreads the load over a larger area, reducing the stress on the soil.
3. Building Height and Load: The height and load of the building also affect the permissible settlement. A taller building with a heavier load will cause more settlement than a shorter building with a lighter load.
4. Water Table: The water table level also affects the permissible settlement. If the water table is high, it can lead to soil consolidation and settlement.
Conclusion
In conclusion, the permissible settlement for a raft foundation on clay soil is relatively higher than that on other types of foundations. This is because the raft foundation spreads the load over a larger area, reducing the stress on the soil. The permissible settlement depends on several factors such as soil type, foundation type, building height and load, and water table level. It is important to consider these factors while designing a foundation to ensure the safety and stability of the structure.
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