1. Liquefaction: Behavior Evidence, Prediction, and Prevention

6. Today’s Menu What is Liquefaction How is it expressed How can we predict its occurrence How can we prevent it from happening

7. What is it Worm’s eye view Professor’s eye view

15. Cyclic Mobility Normally stable soils cross phase line Stress reversals cause it to happen over and over

16. Expression of Liquefaction Sand boils and flows – free-field Landslides – static lateral stress Foundation Failures – surface loadings

27. Empirical Approach, Shear Wave Velocity

28. Empirical Approach, Cone Resistance

30. Stress Reduction Factor

31. Empirical Strength Based on N, Blow Count

36. Prevention/Control Soil modification Reduced Loads Drainage (pore pressure relief)