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

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## Calculate Bearing Capacity From Spt n Value

### Terzaghi's Bearing Capacity Equations

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### Updating Bearing Capacity – SPT Graphs

roads maryland gov OPR Research MD 02 SP007B49 Officials (AASHTO) bearing capacity equations If laboratory testing is performed on the bearing soils, and engineering properties such as unit weight, shear strength, compressive strength, etc, are determined, the bearing capacity can be determined using AASHTO bearing capacity equations, which are included in the report
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ipublishing co in ijcserarticles twelve articles vol determined from corrected SPT N" value After that, determine bearing capacity factors to calculate the bearing capacity of the soil From this bearing capacity of soil foundation can be designed (Humyral et al 2012) When the SPT hammer impacts the drill rod, it creates a
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### Terzaghi's Bearing Capacity Equations

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• 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