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What is the Safe Bearing Capacity values for Different Soils?

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Asked: May 20, 20212021-05-20T05:38:12-07:00 2021-05-20T05:38:12-07:00In: Geotechnical Engineering
Gopal Mishra
Gopal Mishra

Gopal Mishra

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Gopal Mishra

In the absence of test data for calculating SBC of soil. What are the assumed safe bearing capacity values for different soils?

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  1. Fasi Ur Rahman

    Fasi Ur Rahman

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    Fasi Ur Rahman
    2021-05-20T05:40:25-07:00Added an answer on May 20, 2021 at 5:40 am

    The capacity of the soil to allow the loads coming from the foundation is called the bearing capacity of the soil.
    It is essential to know the bearing capacity of the soil before designing the foundation. Different field tests can determine it. However, standard safe bearing capacity values are available for different soil types, and these values can be assumed where test data is limited or speedy construction is required.

    S.No Type of Soil Safe Bearing Capacity ( kN/m2)
    Cohesive Soils
    1. Soft shale, hard or stiff clay in a deep bed, dry state 440
    2. Medium clay readily indented with a thumbnail 245
    3. Moist clay and Sand clay mixture, which can be indented by thumb pressure 150
    4. Black cotton soil/expansive clay ( 50% saturated) in the dry state 130 to 160
    5. Soft clay indented with moderate thumb pressure 100
    6. Very soft clay which can be penetrated with the thump up to few centimeters 50
    Cohesionless Soil
    7. Compact gravel/sand and gravel mixture with good resistance against penetration of tools 440
    8. Compact and dry coarse sand 440
    9. Compact and dry medium sand 245
    10. Loose gravel or sandy gravel mixture, dry state 245
    11. Fine sand and silt ( consists of dry lumps) 150
    12. Loose and dry fine sand 100
    Rocks
    13. Hard rocks such as granite trap, diorite, etc. 3240
    14. Laminated rocks such as sandstone, limestone, etc. 1620
    15. Residual deposits of shattered and broken bedrock and hard shale cemented material 880
    16. Soft rocks 440
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