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Gravity Wall
Active earth pressure - the Absi theory
Active earth pressure is given by the following formula:
| where: | σz | - | vertical geostatic stress |
| cef | - | effective cohesion of 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 | - | angle of friction structure - soil | |
| 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 | - | angle of friction structure - soil | |
| α | - | back face inclination of the structure |
Literature:
Kérisel, Absi: Active and Passive Earth Pressure Tables, 3rd ed., Balkema, 1990 ISBN 90 6191886 3
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