Delwyn G' Fredlund

1
Effective Stress Do We Need it for Unsaturated
Soil Mechanics?
Lecture at Zhejiang University May 18, 2009
Delwyn G. Fredlund Golder Associates
Ltd Saskatoon, Sask., Canada
2
What is Effective Stress?
(s uw)

• - Is it an Equation?
• - Is it a Law?
• - Is it a Constitutive Equation?
• - Is it a Concept?
• - Is it a Principle?
• - Is it a Stress State Variable?
• - Is it a Tensor?

• And where does Effective Stress come from?
• Is Effective Stress only for to Saturated Soils?