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GEO5

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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.