PDF -Terzaghi's Bearing Capacity Equations - Calculate Bearing Capacity From Spt n Value
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- Pit and Pipe Invert Levels
- Self-cleansing flow conditions for inverted siphons
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- pipe invert levels shown on pit schedules and drainage longitudinal
- Further guidance on the estimation of the flows and loads
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- g Capacity From Spt n Value

HOW TO CALCULATE BEARING CAPACITY OF SHALLOW FOUNDATION IN SAND FROM SPT VALUES OR N-VALUES (IS-6403) STEP-1

Perform standard penetration test on the location for which you want to calculate bearing capacity

This is done as per standard procedure given in IS-2131

width and length of foundation for initial calculation

In the first attempt,

you can never get the exact size of foundation which will satisfy all of your needs

Calculate the cumulative average value of corrected SPT values from the base level of foundation to a depth equal to 2 times the width of foundation

Correlate the above cumulative average SPT value with the fig given below to find out the corresponding angle of shearing resistance (ϕ)

Calculate effective surcharge at the base level of foundation by multiplying the effective unit weight of soil with the depth of the foundation i

- q = ϒ*Df Where,

q = Effective surcharge at the base level of foundation,

in kgf/cm 2 ϒ = Unit weight of soil,

in kgf/cm3 Df = Depth of foundation,

- in cm STEP-6

find out the corresponding values of bearing capacity factors (i

For the intermediate values of ‘ϕ’,

- make linear interpolation

sq & sϒ) using formula given below

in cm L'= Length of foundation,

- in cm STEP-8

dq & dϒ) using following formula

dq=dϒ=1 (for ϕ < 100) dq = dϒ = 1+0

- 1(Df/B)(Nϕ)1/2 (for ϕ>100) Nϕ is calculated using following formula Nϕ = tan2[(π/4)+(ϕ/2)] STEP-9

iq & iϒ) using the formula given below

α = Inclination of the load to the vertical in degrees ϕ = Angles of shearing resistance in degrees STEP-10

- 5[Dw/(Df+B)] Where,

in cm Df = Depth of foundation,

STEP-11

Using the equation given below calculate the net ultimate bearing capacity

qd = Net ultimate bearing capacity of foundation,

kgf/cm2 q = Effective surcharge at base level of foundation,

in kgf/cm2 (Refer step-5) Nq & Nϒ = Bearing capacity factors (Refer step-6) sq & sϒ = Shape factors (Refer step-7) dq & dϒ = Depth factors (Refer step-8) iq & iϒ = Inclination factors (Refer step-9) W’ = Correction factor for location of water table (Refer step-10) B = Width of foundation,

in cm ϒ = Bulk unit weight of foundation soil,

- in kgf/cm3