Bearing Capacity Terzaghi

ENGINEERING – GEOTECHNICAL ENGINEERING CALCULATOR Bearing Capacity Terzaghi A precise tool.
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What is the Bearing Capacity Terzaghi & How does it work?

Terzaghi’s bearing capacity theory provides a fundamental framework for estimating the load‑carrying capacity of shallow foundations. It separates the contribution of soil cohesion, the over‑burden stress due to the weight of the soil above the footing, and the shear resistance generated by the soil’s internal friction.

For a strip footing the ultimate bearing capacity is expressed by the classic Terzaghi equation, which combines these three mechanisms through dimensionless bearing‑capacity factors that depend on the soil’s friction angle.

q_{u}=c’ N_{c}+q N_{q}+frac{1}{2}gamma B N_{gamma}
q_u = ultimate bearing capacity (kPa)
c’ = cohesion (kPa)
N_c, N_q, N_gamma = bearing‑capacity factors (function of Ο†)
q = overburden pressure (kPa)
Ξ³ = unit weight of soil (kN/mΒ³)
B = footing width (m)

The bearing‑capacity factors N_c, N_q and N_Ξ³ are derived from the soil’s internal friction angle (Ο†) and reflect how shear strength and confining stress contribute to the overall capacity. By inserting realistic field values into the equation, engineers can quickly assess whether a proposed foundation will remain safe under the anticipated loads.

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Frequently Asked Questions
What is the ultimate bearing capacity in Terzaghi’s theory?
The ultimate bearing capacity is the maximum load a soil can support without failure, calculated by considering soil cohesion, overburden stress, and internal friction.
How does the overburden stress affect the bearing capacity?
Overburden stress increases with depth due to the weight of the soil above the footing, contributing significantly to the total bearing capacity.
What is the role of soil cohesion in Terzaghi’s equation?
Soil cohesion contributes directly to the ultimate bearing capacity by providing resistance against shear failure at the base of the foundation.
How does internal friction influence the bearing capacity?
Internal friction, measured by the angle of shearing resistance, enhances the soil’s ability to resist lateral forces and thus increases the bearing capacity.
Can this calculator be used for different types of footings?
This specific calculator is designed for strip footings. For other footing types, different equations or adjustments may be necessary.

Results are for informational purposes only and do not constitute professional advice.