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 the 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.