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Active Earth Pressure

Active earth pressure is the smallest limiting lateral pressure developed at the onset of shear failure by wall moving away from the soil in the direction of the acting earth pressure (minimal wall rotation necessary for the evolution of active earth pressure is about 2 mrad, i.e. 2 mm/mofthe wall height).

The following theories and approaches are implemented for the computation of active earth pressure assuming effective stress state:

  • The Mazindrani theory (Rankine)
  • The Coulomb theory
  • The Müller-Breslau theory
  • The Caquot theory
  • The Absi theory

For cohesive soils the tension cutoff condition is accepted, i.e. if due to cohesion the negative value of active earth pressure is developed or, according to more strict requirements, the value of "Minimum dimensioning pressure" is exceeded, the value of active earth pressure drops down to zero or set equal to the "Minimum dimensioning pressure".

The program also allows for running the analysis in total stresses.