PPT Slide

• An increase in the energy per unit volume required for liquefaction (all other parameters being held equal) could result from either:

  • a rise in the uniformity coefficient or
  • a drop of the coefficient of concavity.

• Similarly, a decrease in the unit energy required for liquefaction (all other parameters being held equal) could result from:

  • low values of the uniformity coefficient (i.e. uniform soil)
  • Traditionally, a uniformly graded sand, 5 > Cu > 10 (assuming Cc = 1.0), was said to be more susceptible to liquefaction, or less resistant, than a well-graded sand. This equation supports that condition.

Influence of Particle Size to the Resistance to Liquefaction

A total of 68 treatment combinations for the four sands, allowed the development of the following regression equation:

log10(?w) = 3.6746 + 0.004877 ?c’ + 0.01039 Dr + 0.21802 Cu
- 2.1444 Cc , R2 = 0.8195

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