This paper presents the results of a numerical simulation of a slope deformation process. The
landslide slope “Grabina” inKoronowo near Bydgoszcz (Poland) serves as an example.Aslope
profile located in the central part of the slope, between the main scarp and the toe of the landslide,
was selected. The average dip of the slope is about 10, and its length is approximately
55 m.
Elasticity, plasticity and viscosity properties were taken into account in the model of the
soil mass that composes the slope. The visco-elastic properties are described by the Burgers
model (Mainardi and Spada 2011), and the plastic ones by the Coulomb-Mohr law.Anumerical
simulation was carried out by the computer code FLAC2D in the plane strain state with the
assumption of the Lagrange routine. The model was discretized taking into account the results
of inclinometric measurements, which proved that the slide movement was concentrated in
a narrow loam zone of 0.5–1.0 m thickness.
No tests of the viscosity parameters were performed, so they were determined by the back
analysis and a trial and error method. The calculation results were verified by comparison with
the displacement measured by the inclinometric method in three boreholes. The analysis performed
demonstrated the possibility of approximating and forecasting landslide displacements
by the combined Burgers and Coulomb-Mohr models.
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