The article presents the results of inclinometric measurements and numerical analyses of soldier-pile wall displacements. The
excavation under investigation was made in cohesive soils. The measurements were conducted at points located at the edge of the cantilever
excavation support system. The displacements of the excavation support observed over the period of three years demonstrated the
pattern of steady growth over the first two months, followed by a gradual levelling out to a final plateau. The numerical analyses were
conducted based on 3D FEM models. The numerical analysis of the problem comprise calculations of the global structural safety factor
depending on the displacement of the chosen points in the lagging and conducted by means of the φ/c reduction procedure. The adopted
graphical method of safety estimation is very conservative in the sense that it recognizes stability loss quite early, when one could further
load the medium or weaken it by further strength reduction. The values of the Msf factor are relatively high. This is caused by the fact
that the structure was designed for excavation twice as deep. Nevertheless, the structure is treated as a temporary one.
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