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Ultimate Bearing Capacity is defined as the minimum gross pressure intensity at the base of the foundation at which the soil fails in shear. Check FAQs
qf=qnet+σs
qf - Ultimate Bearing Capacity?qnet - Net Ultimate Bearing Capacity of Soil?σs - Effective Surcharge in Kilo Pascal?

Ultimate Bearing Capacity Example

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With units
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Here is how the Ultimate Bearing Capacity equation looks like with Values.

Here is how the Ultimate Bearing Capacity equation looks like with Units.

Here is how the Ultimate Bearing Capacity equation looks like.

38.75Edit=38.3Edit+0.45Edit
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Ultimate Bearing Capacity Solution

Follow our step by step solution on how to calculate Ultimate Bearing Capacity?

FIRST Step Consider the formula
qf=qnet+σs
Next Step Substitute values of Variables
∴ qf=38.3kN/m²+0.45kN/m²
Next Step Convert Units
∴ qf=38300Pa+450Pa
Next Step Prepare to Evaluate
∴ qf=38300+450
Next Step Evaluate
∴qf=38750Pa
LAST Step Convert to Output's Unit
∴qf=38.75kPa

Ultimate Bearing Capacity Formula Elements

Variables
Ultimate Bearing Capacity
Ultimate Bearing Capacity is defined as the minimum gross pressure intensity at the base of the foundation at which the soil fails in shear.
Symbol: qf
Measurement: PressureUnit: kPa
Note: Value should be greater than 0.
Formulas to find Ultimate Bearing CapacityOpen Variable
Net Ultimate Bearing Capacity of Soil
Net Ultimate Bearing Capacity of Soil is the minimum net pressure intensity causing shear failure.
Symbol: qnet
Measurement: PressureUnit: kN/m²
Note: Value should be greater than 0.
Formulas to find Net Ultimate Bearing Capacity of SoilOpen Variable
Effective Surcharge in Kilo Pascal
Effective Surcharge in Kilo Pascal also called as surcharge load refers to the vertical pressure or any load that acts over the ground surface additional to basic earth pressure.
Symbol: σs
Measurement: PressureUnit: kN/m²
Note: Value should be greater than 0.
Formulas to find Effective Surcharge in Kilo PascalOpen Variable

Other Formulas to find Ultimate Bearing Capacity

​Go Ultimate Bearing Capacity of Soil under Long Footing at Surface of Soil
qf=((Ctan(Φi))+(0.5⋅γd⋅B⋅KP)⋅(KP⋅exp(π⋅tan(Φi))-1))
​Go Ultimate Bearing Capacity given Depth of Footing
qf=qnet'+(γ⋅Dfooting)

Other formulas in Bearing Capacity of Soils category

​Go Effective Surcharge given Depth of Footing
σs=γ⋅D
​Go Net Ultimate Bearing Capacity given Ultimate Bearing Capacity
qnet=qf-σs
​Go Net Safe Bearing Capacity
qnsa=qnet'FOS
​Go Net Ultimate Bearing Capacity given Net Safe Bearing Capacity
qnet'=qnsa⋅FOS

How to Evaluate Ultimate Bearing Capacity?

Ultimate Bearing Capacity evaluator uses Ultimate Bearing Capacity = Net Ultimate Bearing Capacity of Soil+Effective Surcharge in Kilo Pascal to evaluate the Ultimate Bearing Capacity, The Ultimate Bearing Capacity formula is defined as the maximum load that foundation soils can withstand, and its reasonable determination is one of the pivotal parts in foundation designs. Ultimate Bearing Capacity is denoted by qf symbol.

How to evaluate Ultimate Bearing Capacity using this online evaluator? To use this online evaluator for Ultimate Bearing Capacity, enter Net Ultimate Bearing Capacity of Soil (qnet) & Effective Surcharge in Kilo Pascal (σs) and hit the calculate button.

FAQs on Ultimate Bearing Capacity

What is the formula to find Ultimate Bearing Capacity?
The formula of Ultimate Bearing Capacity is expressed as Ultimate Bearing Capacity = Net Ultimate Bearing Capacity of Soil+Effective Surcharge in Kilo Pascal. Here is an example- 0.0842 = 38300+450.
How to calculate Ultimate Bearing Capacity?
With Net Ultimate Bearing Capacity of Soil (qnet) & Effective Surcharge in Kilo Pascal (σs) we can find Ultimate Bearing Capacity using the formula - Ultimate Bearing Capacity = Net Ultimate Bearing Capacity of Soil+Effective Surcharge in Kilo Pascal.
What are the other ways to Calculate Ultimate Bearing Capacity?
Here are the different ways to Calculate Ultimate Bearing Capacity-
  • Ultimate Bearing Capacity=((Prandtls Cohesion/tan(Angle of Internal Friction of Soil))+(0.5*Dry Unit Weight of Soil*Width of Footing*sqrt(Coefficient of Passive Pressure))*(Coefficient of Passive Pressure*exp(pi*tan(Angle of Internal Friction of Soil))-1))OpenImg
  • Ultimate Bearing Capacity=Net Ultimate Bearing Capacity+(Unit Weight of Soil*Depth of Footing in Soil)OpenImg
Can the Ultimate Bearing Capacity be negative?
No, the Ultimate Bearing Capacity, measured in Pressure cannot be negative.
Which unit is used to measure Ultimate Bearing Capacity?
Ultimate Bearing Capacity is usually measured using the Kilopascal[kPa] for Pressure. Pascal[kPa], Bar[kPa], Pound Per Square Inch[kPa] are the few other units in which Ultimate Bearing Capacity can be measured.
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