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Queensferry

Module 09

Immediate settlement of shallow foundations

The calculation is easy. Knowing E is the hard part.

What this module covers

  • Compute immediate settlement of a shallow foundation on an elastic half-space
  • Distinguish rigid and flexible foundation behaviour and say which to compare against
  • Explain why the modulus, not the equation, dominates the uncertainty
  • Select an appropriate stiffness for the stress and strain range a foundation actually imposes

Lessons

  1. Rigid, flexible, and which number you are comparing.

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  2. The number that decides the answer, and how to choose it.

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Module checkpoint

Check what you have taken in

2 questions

  1. Question 1

    A flexible foundation's centre settles 18.3 mm. Taking the rigid case as 93% of that, what does an equivalent rigid foundation settle, in mm?

  2. Question 2

    Which input dominates the uncertainty in an immediate settlement prediction?