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.
