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Passive Earth Pressure - The Coulomb Theory

Passive earth pressure follows from the following formula:

where:

σz

-

effective vertical geostatic stress

Kp

-

coefficient of passive earth pressure due to Coulomb

c

-

cohesion of soil

The coefficient of passive earth pressure Kp is given by:

where:

φ

-

angle of internal friction of soil

δ

-

angle of friction between structure and soil

β

-

slope inclination

α

-

back face inclination of the structure

The vertical σpv and horizontal σph  components of passive earth pressure are given by:

where:

δ

-

angle of friction between structure and soil

α

-

back face inclination of the structure

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