A and B are Skempton's pore pressure parameters and $∆ σ_{1}$ and $∆ σ_{3}$ are increemental principal stresses. Skempton's pore pressure equation is given by

- 1
  
  $∆ u = A [∆ σ_{3} + B (∆ σ_{1} - ∆ σ_{3})]$
- 2
  
  $∆ u = B [∆ σ_{3} + A (∆ σ_{1} - ∆ σ_{3})]$
- 3
  
  $∆ u = A [∆ σ_{3} + B (∆ σ_{1} + ∆ σ_{3})]$
- 4
  
  $∆ u = B [∆ σ_{3} + A (∆ σ_{1} + ∆ σ_{3})]$

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