Active Earth Pressure - The Absi Theory
Active earth pressure is given by the following formula:
where: | σz | - | vertical geostatic stress |
cef | - | effective cohesion of the soil | |
Ka | - | coefficient of active earth pressure | |
Kac | - | coefficient of active earth pressure due to cohesion |
The program takes values of the coefficient of active earth pressure Ka from a database, built upon the values published in the book: Kérisel, Absi: Active and passive earth Pressure Tables, 3rd Ed. A.A. Balkema, 1990 ISBN 90 6191886 3.
The coefficient of active earth pressure Kac is given by:
for: 
for: 
where: | φ | - | angle of internal friction of soil |
δ | - | ||
β | - | slope inclination | |
α | - | back face inclination of the structure |
Horizontal and vertical components of the active earth pressure become:
where: | σa | - | active earth pressure |
δ | - | ||
α | - | back face inclination of the structure |
Literature:
Kérisel, Absi: Active and Passive Earth Pressure Tables, 3rd ed., Balkema, 1990 ISBN 90 6191886 3.