Bearing Capacity Calculator
Bearing Capacity
Calculate the ultimate and allowable bearing capacity of soil using Terzaghi bearing capacity equation for foundation design.
Formula
qu = c x Nc + q x Nq + 0.5 x gamma x B x Ngamma; qa = qu / Factor of Safety; Nq = e^(pi x tan(phi)) x tan^2(45 + phi/2); Nc = (Nq - 1) / tan(phi); Ngamma = 2(Nq + 1) x tan(phi)
Frequently Asked Questions
What is bearing capacity?
Bearing capacity is the maximum pressure a soil can support from a foundation without failing through shear or excessive settlement. It determines the size and type of foundation needed for a structure.
What factor of safety is used for foundations?
A factor of safety of 3 is standard for most building foundations. Critical structures may use higher values. The allowable bearing capacity is the ultimate capacity divided by the factor of safety.
What affects soil bearing capacity?
Key factors include soil type, cohesion, internal friction angle, depth of foundation, groundwater level, and foundation width and shape. Clay soils rely on cohesion while sandy soils rely on friction.
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