PDF- -Terzaghi's Bearing Capacity Equations - Calculate Bearing Capacity From Spt n Value
• g Capacity From Spt n Value

#### Description

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

# Standard penetration test must be done at every 75 cm in vertical direction

### Decide the depth,

width and length of foundation for initial calculation

## This is a trial and error process

In the first attempt,

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

## Apply necessary corrections to the standard penetration test values

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)

### Relation between phi and SPT value (N)

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

## For the angle of shearing resistance value (ϕ) as calculated in step-4,

find out the corresponding values of bearing capacity factors (i

#### Nq & Nϒ) from the table given below

For the intermediate values of ‘ϕ’,

• make linear interpolation

### Calculate shape factors (i

sq & sϒ) using formula given below

## B = Width of foundation,

in cm L'= Length of foundation,

• in cm STEP-8

## Calculate depth factors (i

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

### Calculate inclination factors (i

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

### Calculate the correction factor for location of water table using the following formula W’ = 0

• 5[Dw/(Df+B)] Where,

## W’ = Correction factor for location of water table Dw = Depth of water table,

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
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