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Sheeting Design
Active earth pressure - the Caqouot 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 following analytical solution (Boussinesque, Caqouot) is implemented to compute the coefficient of active earth pressure Ka:
| where: | Ka | - | coefficient of active earth pressure due to Caquot |
| KaCoulomb | - | coefficient of active earth pressure due to Coulomb | |
| ρ | - | conversion coefficient – see further |
| where: | β | - | slope inclination behind the structure |
| φ | - | angle of internal friction of soil | |
| δ | - | angle of friction structure - soil |
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 behind the structure | |
| 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 |
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