Arrango Theory
The program follows the Coulomb theory to compute the values of Ka and Kp while taking into account the dynamic values (α*, β*).
For active earth pressure:
For passive earth pressure:
where: | β | - | slope inclination |
α | - | back face inclination of the structure | |
ψ | - | seismic forces inclination |
The coefficients of earth pressures Kae and Kpe are found by multiplying the coefficients Fae and Fpe by the values of Ka and Kp, respectively.
where: | α | - | back face inclination of the structure |
ψ | - | seismic forces inclination |
If the value of the angle β* becomes larger than φ the program assumes the value (β* = φ). The values of computed and modified angle β* can be visualized in the output - in latter case the word MODIFIED is also displayed. It is the user's responsibility to check in such case whether the obtained results are realistic.
Example of the program output
Literature:
Design of sheet pile walls, Pile Buck Inc., Vero Beach, Florida, www.pilebuck.com.