Lesson 08 - Shallow Foundations
Lesson 08 - Shallow Foundations
Lesson 08 - Shallow Foundations
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⎛ ⎛ α1<br />
−⎞b<br />
b1<br />
− ⎜ ⎟<br />
q −⎜<br />
⎟<br />
⎝147.3<br />
⎠<br />
⎝ Nc<br />
tan φ ⎠<br />
Inclined Base<br />
gFootings with inclined base should be<br />
avoided or limted to angles less than 8-1<strong>08</strong><br />
10º<br />
qg ⎞ Sliding may be an issue for inclined bases<br />
Factor<br />
Base<br />
Inclination<br />
Factors,<br />
b c<br />
, b γ<br />
, b q<br />
Friction<br />
Angle<br />
Cohesion<br />
Term (c)<br />
Unit Weight<br />
Term (γ)<br />
Surcharge<br />
Term (q)<br />
b c<br />
b γ<br />
b q<br />
φ = 0 1.0 1.0<br />
φ > 0 (1-0.017α tanφ) 2 (1-0.017α tanφ) 2<br />
φ= friction angle, degrees;<br />
α = footing inclination from horizontal, upward +, degrees
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