• Design Values For Substructure

    N-values (from SPT Test) KN/m2

    Type Of Sand

    Φ (Angle Of Friction)

    <40

    Very Loose

    <28o

    40 - 100

    Loose

    28 – 30o

    100 - 300

    Medium Dense

    30 – 36o

    300 - 500

    Dense

    36 – 41o

    > 500

    Very Dense

    > 41o


    N-values (from SPT Test) KN/m2

    Type Of Clay

    UCC Strength

    KN/m2

    <20

    Very Soft

    <25

    20-40

    Soft

    25-50

    40-80

    Medium Stiff

    50-100

    80-150

    Stiff

    100-200

    150-300

    Very Stiff

    200-400

    >300

    Hard

    > 400

    * Practical Values


    * N-Value = Safe Bearing Capacity of a soil

    * For Clayey Soils Consider UCC strength for design Purposes.

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