I.L.A. is a complete slope stability analysis program that also
incorporates powerful features for retaining system designing.
The slope analysis and design can be performed using the Sarma
method, whose numerical stability increases the reliability of
the calculations. The classic Bishop, Jambu, Morgenstern &
Price and Bell methods are also available; this allows to
compare the results and obtain a more complete and affordable
elaboration.
The failure surfaces can
either be defined as circular or planar surface families or even
individually, as polygonal surfaces, and therefore have any
shape whatsoever. The analysis can be carried out under drained
or undrained conditions, also considering water pressures,
surcharges, and seismicity (pseudostatic analysis).
The calculation method
used for designing the retaining system is of particular
importance.
Common programs only allow the determination of the safety
factor that can be obtained when a given force is applied to the
slope. The program uses instead complex inverse formulae which,
given the geotechnical parameters and a required safety factor,
restitute the reaction force that the retaining system should
offer to obtain such a safety factor.
The program automatically extends the retaining system analysis
to all the failure surfaces, offering a complete and immediate
result without manual iterations of the calculation.
In the case in which the reaction forces result to be higher
than the allowable loads, the safety factor that corresponds to
the actually obtainable reaction force is calculated.
The program also yields
excellent results for the calculation of reinforced slope.
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I.L.A.