285/33310–15FE Reference Handbook 10.4 · Civil · Geotechnical · Settlement

Handbook formula

Immediate (Elastic) Settlement

Undrained elastic settlement of a footing. Es, ν from handbook/soil tables; Is shape, Id depth. Separate from consolidation Sc=mv Δσ H or Cc log.

Net bearing pressure
Modulus of soil
Influence factors

Step-by-step solved example

q=200 kPa, B=2 m, ν=0.5, Es=20 MPa, Is Id=1.0. Si?

qB
Elastic settlement of a footing: q B (1−ν²)/Es.
  1. 1. (1−ν²)/Es

    (1−0.25)/20000 kPa=0.75/20000=3.75e-5 /kPa.

  2. 2. Si

    200×2×3.75e-5=0.015 m=15 mm.

Answer: Si = 15 mm

10 practice questions

0/10 correct

1.Consolidation settlement is additional and

2.ν=0.5 for

3.If Es doubles, Si

4.B is

5.Secondary compression Cα comes

6.q=100 kPa, B=3 m, Es=15 MPa, ν=0, I=1: Si=

7.A deeper embedment Id<1 typically

8.Sand settlements are mostly

9.Influence Is is larger for

10.Net q is