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Active earth pressure - the Coulomb 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 coefficient of active earth pressure Ka is given by:
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:
Arnold Verruijt: Soil mechanics, Delft University of Technology, 2001, 2006, "http://geo.verruijt.net/"
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